Abstract

North Carolina, the nation’s third-largest hog producer, generates over $10 billion annually but faces major environmental and public health challenges from industrial waste lagoons. Concentrated hog operations contribute to air and water pollution, odor complaints, and heightened risks during hurricanes, with disproportionate impacts on nearby rural communities. This paper traces the evolution of the state’s hog industry and highlights the economic pressures on farmers under contract farming systems. It proposes converting hog waste into fertilizer pellets as a sustainable solution, supported by tax credits, performance-based incentives, odor controls, and regional pellet hubs. By turning waste into a resource, these policies would reduce pollution, protect communities, and position North Carolina as a leader in sustainable hog farming.

Introduction

In his 1728-36 manuscript, William Byrd, of Westover, details his encounter with the people of North Carolina and their relationship to pork. Byrd writes, “The only business here is raising of hogs…and affords the diet [North Carolinians] are most fond of. The truth of it is, the inhabitants of North Carolina devour so much swine's flesh, that it fills them full of gross humours…we had a true Roanoke entertainment of pork upon pork, and pork again upon that.”[1] Certainly, not much has changed since 1700s with respect to North Carolinian’s love of pork, especially when it comes to our defining humble yet savoring vinegar, pepper-based pork barbecue.

The late 19th and early 20th centuries in North Carolina saw the transition from small-scale, family-owned hog operations to more commercialized and specialized farms.[2] This transformation was driven by the emergence of a new university specializing in agricultural research and development called the North Carolina College of Agriculture and Mechanic Arts (now North Carolina State University). Improvements in breeding techniques, nutrition, and veterinary care led to the development of larger and more efficient hog farms. Innovations in processing and preservation techniques also allowed North Carolina to export pork products to other states and even internationally.

By the mid-20th century, industrial-scale hog production marked a significant turning point in the history of hog farming in North Carolina. The introduction of confinement systems, where hogs are raised in enclosed buildings, allowed for greater control over their environment and feeding. This shift toward confinement systems led to the concentration of hog production into larger, vertically integrated operations.

Today, North Carolina’s hog and pork processing industry continues to be an economic powerhouse, generating more than $10 billion in economic output for the state.[3] However, the shift from traditional, pasture-based pig farming to industrial models, where thousands of hogs are housed in confined spaces, introduced major waste management challenges. Industrial hog farms produce millions of gallons of waste annually, which require systematic management to avoid environmental and public health issues.

Universities like NC State have been proactive in researching solutions. For example, in the summer of 2000, NC State received a $15 million grant to coordinate the development and identification of environmentally friendly technologies for the treatment of hog waste.[4] While there are innovations being developed, the issue of industrial level hog waste persists as a consequential matter for many eastern North Carolina communities.

To address these issues, a new integrated solution proposes converting hog waste into fertilizer pellets. This approach reduces pollution, odor, and storm vulnerability while creating economic value. Key elements include reinstating a 35% state tax credit, offering performance-based waste treatment incentives, funding regional pellet hubs, banning new facilities in floodplains, and mandating odor controls.

By combining smart incentives with stronger safeguards and modern technologies, North Carolina can lead the way in sustainable hog farming—protecting communities, supporting farmers, and turning waste into a resource.

Economic Impact & Industry Conditions

According to recent reporting by the USDA National Agricultural Statistics Service and the North Carolina Dept. of Agriculture & Consumer Services, North Carolina stands as the third-largest producer of hogs and pigs in the United States, with a total of 7.9 million head as of January 1, 2023, representing 10.5% of national production.[5] The state's hog industry is a major contributor to its agricultural economy, generating approximately $2.66 billion in cash receipts in 2023—about 17% of North Carolina’s total farm commodity sales, which amounted to $15.65 billion.

​North Carolina is a significant contributor to U.S. pork exports. In 2022, the state's pork exports were valued at approximately $781 million, making it the third-largest agricultural export from North Carolina.[6] The primary international markets for North Carolina's pork include Mexico, Canada, Japan, South Korea, and China.[7]

Hog farming is particularly concentrated in the eastern region of the state, with Duplin and Sampson Counties leading the way, housing 1.8 million and 1.75 million hogs, respectively. Other significant hog-producing counties include Bladen, Wayne, Greene, Robeson, Lenoir, Pitt, Pender, and Columbus, each with hog populations ranging from 215,000 to 630,000. This concentration makes eastern North Carolina a major hub for hog production, highlighting the industry's vital role in both the state and national agricultural landscapes.

North Carolina’s hog farming industry is a vital part of the state's agricultural and overall economy, characterized by a large number of operations, many of which are family-owned and operated. Over 80% of hog farms in North Carolina are family-owned, with many farms passed down through generations, reflecting a deep-rooted tradition of hog farming in the state.[8]

The industry largely operates under a contract farming model, where independent farmers raise hogs supplied by large companies regularly referred to a “Big Ag.” This model allows family farmers to partner with corporations that provide the animals, feed, veterinary care, and technical support. Among these large companies, Smithfield Foods stands as the dominant player, not only in North Carolina but also globally, as the world’s largest pork producer and processor.

In North Carolina alone, Smithfield Foods contracts with approximately 930 independent farms, according to Business North Carolina Magazine.[9] According to recent data on Concentrated Animal Feeding Operations (CAFOs), there are roughly 2,200 hog operations totaling 8 million hogs in North Carolina.[10] This suggests that Smithfield Foods make up about 42% of all hog farming operations in the state. Smithfield’s influence is significant—even beyond its share of total farms—as many of the largest operations, in terms of hog numbers, are under Smithfield’s system. Additionally, Smithfield operates five production sites, 26 feed facilities, and a distribution center within the state, highlighting its extensive infrastructure.

Other key integrators in North Carolina include Prestage Farms, a large family-owned pork producer and processor with more than 450 farm family contracts,[11] and Tyson Foods. Together, these major companies dominate the state’s hog farming landscape.

Waste Management, Risk Exposure, & Regulation

While hog farms have positively impacted the bottom-line of North Carolina’s economic portfolio, the industrialization of hog farms has introduced a negative consequence in the form of waste management.

The state's hog waste management works by funneling feces, urine, and blood from hog farms into massive open waste lagoons, which let off foul odors and methane gas.[12] When the lagoons become full, the wastewater is often sprayed onto fields as nutrients for crops. The waste, which contains harmful bacteria like E. coli or salmonella, can wash off into local waterways and cause groundwater contamination.

The rapid expansion of hog farming in North Carolina during the 1990s brought significant environmental, public health, and community concerns, especially regarding the management of hog waste. Most farms relied on the lagoon and sprayfield system, which stores large volumes of liquid animal waste in open-air pits (lagoons) and later sprays the waste onto nearby fields as fertilizer.[13] As hog farms multiplied, complaints over water pollution, odors, air quality, and health risks from waste disposal methods became widespread.[14]

While responsive and functional, this system is exposed to risks that could amplify the threat to water quality, air quality, and human health during heavy rains and hurricanes, which are common in North Carolina’s coastal plain. This was confirmed with the advent of Hurricane Fran. In 1996, Hurricane Fran flooded eastern North Carolina, killing some 16,000 pigs and carrying away the animals’ waste.[15]

In response to these growing concerns, the North Carolina General Assembly passed H.B. 515, a comprehensive and balanced program to protect water quality, public health, and the environment, in 1997.[16] This law established a temporary moratorium on new or expanding swine farms and the construction of associated waste lagoons and management systems. The moratorium, originally set to expire in 1999, was intended to give counties time to adopt zoning ordinances, allow completion of ongoing environmental studies, and enable the legislature to review findings before permitting further industry growth.

However, the issue became even more urgent when Hurricane Floyd hit North Carolina in 1999, causing several hog waste lagoons to overflow and contaminate rivers, streams, and communities, drowning about 30,000 hogs and once again carrying away their waste. The incident garnered national attention, exposing the environmental vulnerability of the lagoon system.[17]

Recognizing these risks, in 2007, North Carolina made the moratorium permanent for all new or expanding swine farms that relied on anaerobic lagoons for waste treatment.[18] Since lagoons are the most affordable and widely used waste management system in hog farming, this permanent ban has effectively stopped the industry's expansion in the state.

Furthermore, the state's Department of Environmental Quality (DEQ) mandates that all permitted swine farms maintain a Certified Animal Waste Management Plan (CAWMP) and undergo annual inspections. These permits define how much waste can be applied to farmland, what crops are grown, and set strict operational standards. However, advanced waste treatment technologies, which could better protect public health and the environment, remain prohibitively expensive for most farmers and come with their own set of community and environmental health concerns, limiting progress toward more sustainable solutions.

The Negative Impact of Industrial Level Hog Waste on Health and the Environment

North Carolina’s large-scale hog farming industry has significant environmental and public health impacts. This section will examine four key areas of concern:

• air quality degradation and respiratory health,
• water pollution,
• odor complaints and quality of life, and
• hurricane vulnerability and waste contamination.

Scientific studies and community reports converge on North Carolina’s experience with intensive hog farming illustrates the substantial environmental and health challenges posed by concentrated animal waste.

Air Quality Degradation and Respiratory Health

Industrial hog farms (often operated as concentrated animal feeding operations, or CAFOs) produce enormous quantities of manure that emit multiple air pollutants. Ammonia (NH₃) is a major emission—an estimated 80% of all ammonia emissions in North Carolina come from livestock waste.[19] Ammonia from hog lagoons and sprayfields readily volatilizes into the air, where it can combine with other gases (e.g., nitric or sulfuric acid) to form fine particulate matter (PM₂.₅) that degrades regional air quality. Hydrogen sulfide (H₂S), a toxic gas with a “rotten egg” odor, is emitted from the anaerobic decomposition of hog waste in lagoons​.[20] Hog operations also release volatile organic compounds (VOCs) like methanol and odorant compounds, as well as bioaerosols containing endotoxins (toxic components of bacteria) and particulate matter such as dried manure and dander. These pollutants can drift into neighboring communities, contributing to odors and forming haze or dust. Importantly, many of these emissions are respiratory irritants: ammonia can inflame airways and is a precursor to fine PM that exacerbates lung and heart conditions​. Hydrogen sulfide and endotoxins can irritate the eyes and respiratory tract, even at low concentrations, and repeated exposure may lead to chronic respiratory symptoms.

A growing body of research in North Carolina links hog CAFO air emissions to adverse respiratory health outcomes in nearby residents. Neighbors of hog farms often report significantly higher rates of respiratory symptoms compared to those living farther away. In one population-based survey in NC, residents living near hog operations experienced more frequent coughing, wheezing, sore throats, runny noses, and burning eyes than demographically similar residents unexposed to hog CAFOs​. These symptoms mirror those seen in swine confinement workers (who often develop chronic bronchitis and reduced lung function), suggesting that community exposure to emissions is sufficient to affect respiratory health​. Children are particularly vulnerable. A well-known North Carolina study of 58,169 adolescents found that indicators of asthma were elevated in schools near hog CAFOs​. Notably, wheezing prevalence was 24% higher among students with allergies attending schools where livestock odor was noticed indoors at least twice a month, compared to students at schools with no such odors​.[21] Even among students without allergies, wheeze rates were ~21% higher with frequent hog odor exposure​. This suggests that airborne contaminants from hog operations (ammonia, dust, etc.) infiltrating school environments can trigger asthma symptoms in children.

Adults living near hog farms have also shown measurable health effects. A community-based NC study monitored 101 adults in communities within 1.5 miles of hog CAFOs over a two-week period, correlating health measurements with pollutant levels. Investigators found that short-term spikes in hog odor, This study found that exposure to certain air pollutants—specifically hydrogen sulfide (H₂S) and fine particulate matter (PM₂.₅)—was linked to breathing problems and irritation of the eyes and throat. When residents reported stronger odors, measured on a scale from 0 to 8, their likelihood of experiencing difficulty breathing increased by 50%. These odors were also associated with more frequent reports of eye and throat irritation. Additionally, a relatively small rise in fine particle pollution—an increase of 10 micrograms per cubic meter over a 12-hour period—more than doubled the odds of residents experiencing wheezing. This level of pollution was also linked to a measurable decline in lung function, with people’s ability to exhale forcefully in one second (a key measure of lung health) dropping by 0.04 liters. Hydrogen sulfide levels were similarly tied to respiratory symptoms; an increase of just 1 ppb H₂S raised the likelihood of irritation symptoms by ~15%​. These findings underscore that emissions from hog waste (odor, gases, and particles) are not merely nuisances but can acutely impact breathing and airway health in downwind communities. Over time, chronic exposure may contribute to higher rates of asthma exacerbation and other pulmonary diseases among residents. Health officials in eastern NC have indeed observed elevated asthma and bronchitis in communities densely populated with hog barns, raising concerns about long-term public health burdens.

Water Pollution

Hog waste contains high levels of nutrients, particularly nitrogen (mostly in the form of ammonia and organic nitrogen) and phosphorus, as well as salts and heavy metals. In North Carolina’s coastal plain—where the vast majority of swine farms are located—the soils are sandy and the water table is high, making groundwater especially susceptible to contamination from waste lagoons and spray fields. A primary concern is nitrate pollution. Ammonia in hog urine and feces is converted to nitrate (NO₃⁻) in soil; if more waste is applied to fields than crops can absorb, the excess nitrate can leach down into groundwater. Multiple studies have documented elevated nitrate levels in groundwater near hog CAFOs. For example, a monitoring study in Duplin County (Herrings Marsh Run watershed) sampled 84 shallow groundwater wells around sprayfields and found that 26% of the wells exceeded the EPA’s drinking water standard for nitrate (10 mg/L)​.[22] About 19% of wells had nitrate between 10–20 mg/L and 7% of wells exceeded 20 mg/L nitrate-N, with one heavily loaded site averaging over 50 mg/L.[23] These concentrations far surpass natural background levels and indicate leaching from hog waste applications. In one egregious case, the EPA issued an emergency order after private wells next to a Johnston County hog farm were found contaminated with dangerous nitrate levels, posing an “imminent and substantial” threat to residents’ health. High nitrate in drinking water is linked to methemoglobinemia (“blue baby syndrome”) in infants and can contribute to various health issues in adults.

In addition to groundwater, nutrient-laden runoff from hog farms affects surface water quality. Rainfall can wash nitrogen and phosphorus from manure-sprayed fields into nearby creeks and wetlands. These nutrients fuel algal blooms that deplete oxygen in water bodies, sometimes leading to fish kills. Eastern NC has seen rivers and estuaries impacted by hog waste runoff – notably the Neuse River basin, where outbreaks of harmful algae and Pfiesteria microbe blooms in the 1990s were partially attributed to excessive nutrient pollution from animal operations.

In northeastern North Carolina, studies have shown that untreated hog waste stored in surface ponds can lead to severe nitrogen contamination in shallow groundwater systems. Specifically, concentrations of ammonium- and nitrate-nitrogen nearing 10,000 ppm were observed migrating from a surface waste pond into the permeable sandy beds of surficial sediments.[24] This nitrogen-rich water traveled with minimal lateral dispersion along the hydraulic gradient above the Yorktown Formation aquiclude, ultimately discharging into the Chowan River. While the underlying Yorktown aquiclude prevented vertical movement into deeper aquifers—limiting contamination of community water supplies—the shallow groundwater in the immediate vicinity was significantly compromised. The findings highlight how hog waste storage, especially in areas with sandy surficial geology, poses a substantial risk of localized water pollution and underscores the importance of improved waste containment and treatment strategies in protecting nearby surface and shallow groundwater resources.

This field and modeling study underscores the risks of nitrate contamination in shallow groundwater beneath agricultural fields in eastern North Carolina, particularly in areas like Duplin and Sampson Counties where both commercial fertilizers and pig waste are heavily applied.[25] The investigation found clear evidence of nitrate pollution in the surficial aquifer at both sites, with the nitrate-laden groundwater moving laterally through the soil rather than penetrating deeply into confined aquifers. A finer textured sediment layer, typically found 10–20 meters below the surface, appears to act as a partial barrier to vertical migration. However, because this layer is not continuous, there remains a possibility for deeper contamination under certain conditions. Importantly, domestic wells situated in the surficial aquifer near or downstream of these agricultural areas were identified as being vulnerable to nitrate levels exceeding recommended drinking water standards. Additionally, a nearby stream draining animal waste-treated land showed elevated nitrogen levels, though still within drinking water limits. These findings highlight the need for careful monitoring and management of nutrient applications, especially near residential water sources and surface waterways.

One dramatic incident occurred in 1995, when an eight-acre lagoon rupture at Oceanview Farms released 25 million gallons of hog waste into the New River, causing a massive fish kill along 17 miles of waterway.[26] In 2020, a failed hog lagoon led to the spill of approximately 1 million gallons of untreated animal waste reaching Tuckahoe Creek, which is approximately 300 feet from the lagoon and flows into the Trent River.[27] Even absent catastrophic spills, chronic nutrient loading is a problem. Researchers have observed that streams draining hog production areas carry higher nitrogen and phosphorus loads than those in non-CAFO areas, contributing to degraded water quality in downstream lakes and estuaries.[28] Because phosphorus binds to soil, it tends to accumulate in fields; heavy rain or flooding can then mobilize it into water, compounding the eutrophication risk. Thus, the nutrient pollution from hog waste disposal is a continual threat to both groundwater used for drinking and surface waters used for recreation and fisheries.

Hog manure is also rife with microbial contaminants. Each hog produces feces containing billions of bacteria (including fecal coliforms like E. coli), viruses, and parasites that can cause disease in humans. When waste overflows or leaches into water, these pathogens can end up in drinking water sources or recreational waters. In rural North Carolina, roughly 2.4 million people rely on private wells for drinking water, yet unlike municipal water, private wells are not routinely monitored for contamination.[29] Studies indicate that hog CAFOs elevate the risk of well water contamination. After waste is sprayed on fields or seeps from lagoons, microbes can percolate through soil or get carried to shallow wells, especially after heavy rains. For instance, the study in eastern NC identified Hog CAFOs as a significant source of nitrate and microbial contamination in nearby private wells, detecting pig-specific bacteria in groundwater down-gradient of waste sprayfields. Residents with contaminated wells may unknowingly consume water with fecal bacteria or nitrates for extended periods, as there is little oversight.

Surface waters near hog operations often show clear signs of fecal contamination. A year-long investigation of streams in proximity to swine CAFOs (spanning sites upstream and downstream of hog waste sprayfields) found consistently high levels of fecal indicator bacteria. More than 40% of the water samples exceeded state and federal safety thresholds for fecal coliforms and E. coli, and 61% of samples violated the standard for Enterococcus—a bacterium indicating fecal pollution.[30] Importantly, researchers in that study employed microbial source tracking and confirmed that genetic markers specific to swine waste (such as Bacteroides bacteria strains unique to pig intestines) were significantly more prevalent in downstream waters, implicating hog operations as the contamination source. These fecal bacteria can transmit gastrointestinal illnesses, skin infections, and other diseases to people who ingest or come into contact with the water. There is also concern about antibiotic-resistant pathogens: industrial hog farms often use antibiotics, and manure can carry resistant bacteria (e.g., MRSA or resistant E. coli). One NC study found that residents living near swine barns were more than 4.5 times as likely to have nasal colonization with antibiotic-resistant Staphylococcus aureus (MRSA) compared to those unexposed, highlighting how environmental pathways (air or water) can spread dangerous microbes. Additionally, over-application of manure can introduce hormones, pharmaceuticals, and heavy metals (like copper and zinc from feed additives) into water supplies, though these are lesser-studied. The overall picture is that mismanaged hog waste threatens water quality on multiple fronts – nitrate pollution of drinking water, eutrophication of rivers, and dissemination of disease-causing organisms – with rural communities and ecosystems suffering the consequences.

Odor Complaints and Quality of Life Impacts

Communities near North Carolina hog farms endure notoriously strong and unpleasant odors, which constitute one of the most immediate and visceral impacts on daily life. Industrial swine operations typically store raw manure in open-air lagoons and spray liquefied waste onto fields, practices that release foul-smelling gases. Neighbors often describe the stench as inescapable, comparing it to rotten eggs, sewage, or ammonia. In fact, controlled measurements have captured how frequently these odors permeate residential areas: In a 16-community study, participants living within ~1.5 miles of hog CAFOs were asked to rate hog odor twice daily. They reported noticing hog odors over 50% of the time on average, with some locations experiencing detectable pig smells nearly every day depending on wind direction​. It is common for residents to be unable to open their windows or spend time outdoors because of the stench. As one study noted, families living adjacent to large swine farms could only rarely enjoy gatherings or hanging laundry outside without encountering nauseating odors.[31] The odors are not just a minor annoyance; they often trigger physical symptoms such as eye burning, throat irritation, nausea, and headaches in those exposed. The persistence and strength of hog odors have led to thousands of nuisance complaints to authorities and multiple high-profile civil lawsuits by North Carolina residents against pork companies in recent years. Residents testify that the odor can be so overpowering that it “takes your breath away” and dramatically reduces the livability and property values of their homes. Unlike temporary farm smells, the chronic nature of hog CAFO odor—with odors present day after day—makes it especially damaging to quality of life in these rural communities.

Chronic exposure to malodor from hog operations has been shown to affect mental and emotional well-being. Pioneering research in North Carolina by Dr. Susan Schiffman and colleagues found that neighbors exposed to intense hog odors experience significantly elevated levels of stress and negative mood states. In one study, a small group of residents living near a swine facility reported markedly higher scores for tension, depression, anger, fatigue, and confusion (and lower scores for vigor) compared to a control group of rural residents not exposed to livestock odor​. These findings, first reported in the late 1990s, have been confirmed and expanded by more recent studies. The Community Health Effects of Industrial Hog Operations (CHEIHO) project in NC found a clear dose-response relationship between odor intensity and stress/mood disturbance. Specifically, as hog odor rose from “noticeable” to “strong,” self-reported stress levels increased, and measures of mood worsened proportionally​. For each 1-unit increase in odor (on a 0–8 scale), researchers observed up to an 81% increase in the odds of experiencing mood problems like anger or depression​. Even objective environmental measures correlated with stress: on days when local hydrogen sulfide concentrations rose by 1 ppb, residents were 18% more likely to report high stress or anxiety. Participants frequently described feeling unable to relax in their own homes due to worry about the smell or embarrassment when visitors came by. Such chronic stress can have downstream health effects, potentially contributing to hypertension or weakened immune function over time.

Beyond mood and stress, malodor undermines overall quality of life and community cohesion. People living near hog CAFOs often limit outdoor activities, avoiding gardening, exercise, or children’s playtime outside on days when the odor is bad​. Many keep their windows closed year-round, and some invest in air purifiers or cover vents to try to keep the smell out – essentially becoming prisoners in their own homes. Social gatherings can be disrupted; one resident recounted a family funeral where the graveside service was engulfed in hog odor, adding to the trauma. These impacts disproportionately affect low-income communities of color (as noted, many hog farms are located near African American or Latino neighborhoods), raising environmental justice concerns about livability and dignity. Indeed, researchers argue that malodor should be recognized as not only a nuisance but a public health stressor that contributes to health disparities​. Epidemiological studies in NC have linked living near hog operations to elevated levels of self-reported anxiety and depression, consistent with the constant stressor of odor and related worries (e.g., about health, property, and social stigma)​. In summary, the odors from hog waste are more than just a smell – they erode quality of life, induce physiological and psychological stress, and impose daily hardships on those in neighboring communities. Efforts to cover lagoons, capture gases, or otherwise mitigate odors have so far been limited in North Carolina, leaving many residents continuing to suffer odor-related impacts on their health and well-being.

Hurricane Vulnerability and Waste Contamination

North Carolina’s coastal plain, the epicenter of its hog industry, is prone to hurricanes and heavy rain events. The standard waste management system – open lagoons and earthen berms – is highly vulnerable to flooding. When intense rain or storm surge inundates these facilities, the results can be disastrous as millions of gallons of liquefied hog waste are released into the environment. Several major hurricanes in the past few decades have vividly illustrated this risk. Hurricane Floyd (1999) produced record flooding that overwhelmed dozens of hog lagoons. More than 50 lagoons were flooded and at least 6 lagoons suffered catastrophic breaches during Floyd​.[32] Vast quantities of manure spilled into rivers and onto the landscape, contributing to outbreaks of waterborne disease and massive fish kills (due to oxygen depletion and toxic ammonia)​. The floodwaters, polluted with raw waste, spread across towns and farms, and in some areas, the environment was so degraded that the spill’s impact was partly masked.

In Hurricane Matthew (2016), eastern NC again saw significant hog waste releases, though on a smaller scale. At least 14 hog lagoons were flooded and 2 breached during Matthew’s flooding​. Photos taken by environmental groups showed pink-colored waste water spilling out of lagoons into swollen rivers. Then came Hurricane Florence in 2018, one of the wettest storms recorded in NC, dumping up to 30 inches of rain in hog country. Florence caused widespread waste lagoon failures: state officials reported 31 lagoons overflowing their banks, 23 lagoons inundated by floodwaters, and 6 lagoons completely breached (structurally damaged) due to the storm​. Overall, 49 lagoons in the region were either discharging waste or structurally damaged in Florence’s aftermath​. The floodwaters mixed with manure spread far downstream – NASA satellite imagery even showed rivers running brown with waste runoff after the hurricane​. These recurrent disasters highlight that extreme rainfall can easily overtop or break open hog lagoons, especially those located in floodplains. North Carolina has over 3,300 permitted swine waste lagoons​, many built before modern siting regulations, and as climate change increases the frequency of heavy storms, the risk of breaches is an ongoing public health threat.[33]

When hog waste lagoons overflow or rupture in hurricanes, the environmental and health consequences are severe. Floodwaters become a noxious soup of bacteria, chemicals, and nutrients. Public health agencies testing floodwater after Hurricane Floyd and Matthew found high levels of fecal bacteria (enteric microbes from hog and livestock waste) and associated pathogens, raising concerns about human exposure for both residents and emergency responders​. Contamination of drinking water wells is a chief worry in the aftermath. Many rural residents on wells have their entire wellheads submerged during floods, which allows pollution to seep directly in. After Hurricane Florence, state testing revealed a sharp spike in well water contamination: nearly 15% of sampled private wells in the flood zone tested positive for E. coli and fecal coliform bacteria, compared to about 2% before the storm​. This indicates that floodwaters carrying hog and other animal wastes infiltrated a significant number of drinking water supplies, putting families at risk of gastrointestinal illnesses or worse. Residents in hard-hit counties were advised to boil water or use bottled water for weeks. Even beyond immediate bacteria issues, the nutrient surge from hog lagoons can cause longer-term ecological damage. The flood-driven manure releases from Floyd, for example, led to algal blooms in estuaries and fish die-offs that took ecosystems time to recover from​. Excess nitrogen and phosphorus flushed downstream can create hypoxic “dead zones” in coastal waters.

These impacts fall disproportionately on communities already burdened by hog pollution. The areas flooded by Florence and other storms include some of the poorest communities in the state, with large African American and Latino populations living near the hog operations​. After Florence, local environmental justice groups like REACH (Rural Empowerment Association for Community Help) reported driving through rural neighborhoods to distribute clean water, noting that many affected residents were people of color who had endured decades of pollution from the same CAFOs​. In some cases, families lose both access to safe water and livable homes due to the stench and contamination left behind as waters recede. Thus, hurricane-related waste spills intensify the environmental injustices already present, layering acute disaster on top of chronic exposure.

In response to these recurring crises, North Carolina has taken some steps to reduce future hurricane damage from hog waste, though progress has been gradual. After Hurricane Floyd (1999), the state established a voluntary buyout program to encourage the closure of hog lagoons located in the highest-risk floodplains. The program was met with an overwhelming number of applications from farmers willing to cease operations on flood-prone sites. However, funding constraints meant only 45 industrial hog farms were bought out and their lagoons permanently closed​. This reduced some risk, but as of 2018 there were still over 100 active hog CAFOs within the 100-year floodplain in eastern NC. The state recently approved an additional $5 million in funding for another round of buyout, but community advocates worry this may not cover many sites and are watching to ensure funds prioritize smaller producers and the most vulnerable locations.

North Carolina also has maintained a moratorium (in place since the late 1990s) on construction of new hog lagoons using the old design, effectively preventing expansion of the lagoon-sprayfield system. In 2000, the state entered an agreement with major pork producers (the Smithfield Agreement) to develop better waste management technologies; while this spurred research into lagoon alternatives, uptake of improved systems has been limited by cost and industry resistance. More recently, as part of a civil rights complaint settlement in 2018, the NC Department of Environmental Quality (DEQ) agreed to update its “storm preparedness” standards for hog operations​. Proposed rules would require farms to strengthen lagoon structures, lower waste levels in lagoons ahead of predicted hurricanes, and have emergency action plans to prevent spills. However, at the time Hurricane Florence hit, these stricter standards had not yet taken effect​. The ongoing push is to enforce measures like lining older lagoons (to reduce seepage), installing flood protections (e.g. higher berms or relocating lagoons out of floodplains), and transitioning to waste treatment technologies that can contain or neutralize waste during extreme weather. Environmental groups also advocate for greater transparency and emergency notification – noting that currently CAFOs are largely exempt from reporting hazardous substance releases, even during disasters​. In summary, hurricanes expose the vulnerability of NC’s hog waste system, and while some policy efforts (buyouts, moratorium, improved standards) are underway to mitigate this risk, full implementation and enforcement will be key. Ensuring these changes is critical to protect downstream communities from another inundation of hog waste-laden floodwater, especially as climate trends point to more frequent heavy rainfall events in the region.

The data show troubling trends in public health: for example, higher rates of asthma symptoms and other ailments in communities near hog CAFOs. The methodologies behind these findings range from air monitoring and health surveys, to water testing for specific microbial markers, to satellite imaging of pollution plumes – providing a rigorous, multi-angle understanding of hog waste impacts. Policy-wise, while North Carolina has taken incremental steps (e.g., moratorium on new lagoons, floodplain buyouts, exploring new technologies), enforcement and additional reforms are needed to address the scale of the problem. Recommendations from experts include upgrading waste treatment (to covered anaerobic digesters or other systems that reduce emissions and spills​), stronger regulation of ammonia and odor emissions, routine monitoring of well water in CAFO regions, and relocating or phasing out the most high-risk facilities in flood-prone and densely populated areas.

Economic Outlook for Hog Farms in North Carolina

The economic outlook for hog farms in North Carolina is facing a period of uncertainty, shaped by a mix of persistent challenges and shifting market dynamics. Although North Carolina remains a major player in the U.S. pork industry, several factors are weighing heavily on hog farmers' profitability and long-term viability. Rising input costs, including feed and labor, continue to pressure margins as farmers struggle to stay afloat amid soft market prices and weakened demand. Roy Lee Lindsay, the CEO of the North Carolina Pork Council, says its possibly the worst economic conditions ever seen in the pork industry.[34] “Our economists are projecting that losses for 2023 on virtually every hog that’s still in the market this year will be something in the neighborhood of $30,” Lindsey tells reporters. “Much like everyone else in the world, we are seeing higher costs for us to do business. So labor costs us more money. We’re short labor to begin with, and then what we have is costing significantly more money. Transportation for animals for feed for supply costs, more fuel prices are higher.”

The persistent threat of inflation could keep costs elevated, limiting any near-term relief for farmers, said John Connaughton, professor of financial economics with UNC Charlotte’s Belk College of Business.[35]

The closure of major processing and distribution facilities, such as Smithfield Foods' Charlotte plant, further compounds these challenges by potentially reducing processing capacity and disrupting regional supply chains.[36] Such closures reflect broader structural shifts in the industry that can limit market access for farmers, increase transportation costs, and add uncertainty to an already strained sector.

Additionally, the lingering effects of major lawsuits, including Smithfield’s $42 million settlement over price-fixing allegations, reflect both ongoing legal risks and public scrutiny over environmental and pricing practices.[37]

Looking into trends from 2024 and tariff policies taking effect in 2025, uncertainty around pork production will likely curve incentives to invest in social responsibility initiatives around minimizing the effects of hog waste on communities and the environment.

All hogs and pigs on North Carolina farms on March 1, 2024, totaled 7.4 million head, down 9% from last year.[38]

In addition to rising costs and structural shifts within the industry, North Carolina hog farmers continue to feel the ripple effects of international trade tensions, particularly the tariffs imposed by China on U.S. pork products during recent trade disputes.[39] As one of the largest importers of American pork, China’s retaliatory tariffs significantly reduced export opportunities for U.S. hog farmers, leading to oversupply in domestic markets and downward pressure on prices.[40] For North Carolina farmers, who are heavily integrated into global pork supply chains, these trade barriers have made it more difficult to secure stable, high-value markets abroad, further intensifying the economic challenges they face.

Despite North Carolina's entrenched role in national hog production, these compounding legal, operational, and market pressures highlight a tough road ahead for the state’s hog farmers, demanding adaptive strategies to navigate an increasingly volatile landscape rather than fostering innovation to improve community well-being and reduce environmental impact.

Integrated Solutions for Sustainable Hog Farming

North Carolina’s hog farming sector faces pressing challenges tied to air quality degradation, water pollution, odor nuisances, and hurricane-related waste contamination—all while striving to remain economically competitive. A comprehensive policy solution can address these intersecting concerns by centering on the conversion of hog waste into fertilizer pellets. This approach transforms a major pollutant into a valuable product, enabling farmers to export nutrient-rich pellets instead of overapplying liquid waste locally, thereby reducing groundwater contamination, odor, and hurricane vulnerability.

At the core of the proposal is a state-supported program to convert solid hog waste into dry fertilizer pellets. These pellets are easier to transport, store, and apply based on precise soil and crop needs. The program would include grants and low-interest loans for on-farm pelletization units, a regional network of pellet hubs equipped with drying and packaging infrastructure, and standardized nutrient labeling to market the product commercially. This system allows for nutrient redistribution to areas that can use it responsibly, alleviating environmental strain in high-density hog regions.

To ensure financial feasibility, the state should reinstate a 35% renewable infrastructure tax credit for waste-to-fertilizer and biogas projects and offer per-pound performance-based credits—such as $100 per 1,000 pounds of treated waste. These incentives, paired with sales tax exemptions on relevant equipment and eligibility for carbon credit revenue, would lower upfront costs and provide ongoing economic returns. Critically, these incentives must be consistent over time to encourage long-term investment.

The proposed 35% renewable infrastructure tax credit and the $100 per 1,000 pounds of treated waste performance-based credit are grounded in both historical precedent and economic necessity. North Carolina previously offered a 35% state tax credit for renewable energy projects,[41] which, when combined with federal incentives, made early biogas and waste-to-energy projects financially viable. Reinstating this credit would help bridge the significant cost gap between outdated waste systems, like open lagoons, and advanced alternatives such as anaerobic digesters and pelletization units, which can be two to four times more expensive. A 35% credit aligns with the federal Inflation Reduction Act’s 30% incentive, making North Carolina projects more competitive and attractive for private investment and utility partnerships.

The $100 per 1,000 pounds credit is designed as a performance-based incentive that rewards farms for actively managing waste through certified sustainable methods. It ensures ongoing compliance rather than one-time infrastructure installation and ties financial support directly to the environmental benefit achieved. This rate is supported by policy models like the proposed federal SWINE Act and is consistent with nutrient and carbon market frameworks, where pollution reductions are monetized per unit. Moreover, this credit reflects a fraction of the societal costs avoided—such as lagoon breach cleanups, health impacts, and odor-related lawsuits—which often amount to millions of dollars per incident. Together, these credits create a stable financial foundation to support the transition to cleaner, more sustainable hog waste management in North Carolina.

Legislative reform would reinforce environmental safeguards. A ban on new hog facilities in floodplains, combined with requirements for levees or relocation of existing operations, would mitigate hurricane-related contamination risks. In addition, a phased mandate to cover or retrofit open lagoons and a requirement to install odor control systems (such as biofilters or impermeable covers) within close proximity to residential areas would greatly improve air quality and community health. These measures would be managed by a new Waste Modernization Compliance Board to ensure enforcement and community engagement.

Supporting logistics are essential. A hub-and-spoke model would allow smaller farms to send solids to centralized pellet hubs, improving efficiency and access. A digital nutrient exchange platform could match pellet supplies with nutrient-deficient agricultural areas across the state, while transportation subsidies would help move waste from oversaturated zones to demand centers. Emergency logistics systems, including mobile pumping equipment and storm-readiness protocols, would minimize overflow risks during hurricanes, making the system more resilient.

To maximize environmental outcomes, the policy also integrates co-technologies such as anaerobic digesters to capture methane from liquid waste, sequencing batch reactors (SBRs) to treat effluent, and constructed wetlands to polish treated water. These technologies work in tandem: digesters reduce odor and generate renewable energy; SBRs improve water quality and reduce land application needs; wetlands provide final polishing and habitat restoration.

Economically, this strategy positions North Carolina as a national leader in sustainable hog production. It creates jobs in renewable energy, fertilizer manufacturing, and transport while attracting green investment. Certified “climate-smart” pork and exported organic fertilizers open new markets, providing farms with diversified income streams and long-term resilience. With stable incentives, modern infrastructure, and a public health-focused framework, this plan converts a liability into a competitive advantage—transforming waste into wealth while restoring trust with communities and protecting the environment.

Conclusion

North Carolina is at a pivotal moment in hog waste management. The future of the industry depends on well-designed policies—such as tax credits, grants, and strategic mandates—that enable widespread adoption of clean technologies without placing undue financial strain on farmers. Past efforts and other states’ experiences show that targeted financial incentives can make otherwise unviable projects possible. With coordinated state and federal support—like the IRA’s biogas credits and a potential revival of North Carolina’s conservation tax credit—the state could catalyze investment across dozens of farms.

While previous policies, from the 2000 Smithfield Agreement to recent farm bills, have favored voluntary incentives, progress has been modest, and pressure is building as the 2025 deadline approaches. North Carolina must now decide whether to expand incentives and industry collaboration or face growing calls for stricter regulation. The path it takes could set a national precedent for managing CAFO waste sustainably.

The environmental and public health benefits of acting are undeniable: cleaner water and air, lower greenhouse gas emissions, and reduced burdens on nearby communities. Technologies like anaerobic digesters, biofilters, sequencing batch reactors, and constructed wetlands each address key aspects of the problem, with the most effective solution likely being an integrated system. A future-proof hog farm might combine covered lagoon digesters, barn biofilters, and wetlands or advanced filters for effluent treatment—fulfilling the vision of “environmentally superior” technology long promised.

Challenges remain in financing, scaling, and operational management, but momentum is growing. Corporate commitments, academic research, and community advocacy are converging around the need for change. The outdated lagoon-and-sprayfield system is increasingly seen as untenable. Moving forward, collaboration between farmers, companies, regulators, and communities is essential. If the economic benefits of biogas and fertilizer are distributed equitably, hog farming can become both cleaner and more profitable. North Carolina’s experience—its pilots, policies, and lessons learned—offers a roadmap. With sustained innovation and smart policy, the state can lead the way in reinventing hog farming for a cleaner, healthier, and more competitive future.

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