Skip Navigation Links Home » Water Quality Information » Montana Pollutant Discharge Elimination System (MPDES) » Domestic Treatment Lagoons

Discharges Associated with Domestic Sewage Treatment Lagoons

The purpose of the Domestic Sewage Treatment Lagoons General Permit is to permit the discharge of treated wastewater from sewage treatment lagoons to state surface waters in accordance with effluent limitations, monitoring requirements and other conditions set forth in the General Permit. Most lagoons that have an average daily design flow of less than one (1) million gallons per day and do not accept significant industrial contributions are eligible for coverage under this General Permit. A written authorization letter from DEQ is required before an applicant is authorized to discharge under the General Permit.

Domestic Sewage Treatment Lagoon

The Domestic Sewage Treatment Lagoons General Permit is in compliance with the Montana Water Quality Act, Title 75, Chapter 5, Montana Code Annotated (MCA), and the Federal Water Pollution Control Act (the “Clean Water Act”), 33 U.S.C. 1251 et. seq.