The U.S. Environmental Protection Agency (EPA) and U.S. Department of Justice (DOJ) have reached a settlement with Old Dutch Mustard Co. over Clean Water Act violations at the company’s mustard and vinegar manufacturing facility in Greenville, New Hampshire.

Under the proposed consent decree, Old Dutch Mustard will pay a $50,000 civil penalty and implement an environmental compliance program addressing stormwater discharges from the facility. The company will also improve monitoring, investigate future pollutant discharges and hire an independent consultant to identify current sources of contamination.

According to the complaint, the facility violated its stormwater discharge permit between 2019 and 2026, resulting in acidic pollutant discharges to a tributary of the Souhegan River. Monitoring data indicated high levels of acidity on at least 1,728 days between November 2019 and December 2026, which EPA said indicated unauthorized wastewater discharges.

The settlement follows multiple previous enforcement actions involving the facility. In February 2025, the company and its president pleaded guilty to separate criminal Clean Water Act violations. The proposed consent decree is subject to a 30-day public comment period.