US industrial discharge permit violations stagnate as deregulation looms

While overall permit violation numbers showed little change in the last year, small signs of progress are evident in the food & beverage and oil & gas industries.

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GWI’s latest analysis of 9,622 industrial facilities across 17 industries in the US reveals that 19% exceeded their National Pollutant Discharge Elimination System (NPDES) permits for at least one pollutant category in 2024. This shows little change from corresponding 2023 data, with the current regulatory landscape doing little to incentivise investment in treatment upgrades at existing industrial sites.

The mining industry remains the biggest culprit, responsible for 29% of total facility permit violations in 2024. The most common pollutant category exceeded is total suspended solids, evident in 45% of mining permit violations, followed by total dissolved solids and sulphate. 

The greatest reduction in violations from 2023-24 came from the food & beverage industry, largely driven by the meat & poultry sector which saw a one-third reduction in the number of facilities exceeding permits. Although the US EPA walked back its proposal to tighten effluent limits for the sector in September this year, it appears that several meat & poultry plants across the country have already begun moving ahead with wastewater treatment upgrades to mitigate nitrogen and phosphorus discharges. 

However, the power generation sector saw an 11% increase in permit violations as the industry faces soaring demand to meet the energy needs of the data centre buildout. More thermoelectric plants are set to extend their operational lifetimes and while the EPA has delayed the deadline for ZLD compliance at coal-fired power plants, further investment will be required to keep pace with the needs of rapid AI growth.  

Meanwhile, the number of oil & gas permit violations decreased by 15% to drop below 100 facilities in total. Although the biggest decline was seen in Louisiana, also dropping by approximately 15% since 2023, the state still accounts for 55% of total oil & gas violations. Several legal cases against major oil companies are ongoing as local communities challenge decades of wetland damage caused by effluent discharges, with Chevron set to appeal an April 2025 ruling ordering it to pay $744 million for marsh restoration.

The full dataset of wastewater discharges from industrial facilities in the US can be accessed on GWI WaterData.

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NPDES INDUSTRIAL FACILITY VIOLATIONS IN THE US

Source: EPA