Biddeford WWTP | Municipal Wastewater Treatment in Biddeford, Maine

Biddeford WWTP is a municipal wastewater treatment facility located at 63 Water Street in Biddeford, Maine, serving a population of about 14,000. The plant is situated in York County, near the southern coast of Maine, and plays a key role in managing wastewater for this historic mill city along the Saco River. As a U.S. facility, Biddeford WWTP operates under the National Pollutant Discharge Elimination System (NPDES) permit program, established by the Clean Water Act. For a plant serving a medium-sized agglomeration of roughly 14,000 people, secondary treatment is typically required, with additional nutrient removal standards in sensitive watersheds. The plant's designed capacity is 1.00 million gallons per day, indicating it is sized for the community's needs. The treated effluent is discharged into the Saco River, which flows into Saco Bay and the Gulf of Maine. This coastal watershed supports diverse marine life, including fish, shellfish, and migratory birds. The plant's proximity to the coast underscores the importance of effective treatment to protect downstream estuarine and marine ecosystems from nutrient pollution and pathogens.

Biddeford WWTP discharges into the Saco River, which flows approximately 20 miles southeast to Saco Bay and the Gulf of Maine. The Saco River estuary supports critical habitats for Atlantic salmon, alewife, and other diadromous fish species, as well as shellfish beds. The coastal waters of the Gulf of Maine are ecologically sensitive, with nutrient inputs from wastewater requiring careful management to prevent eutrophication and harmful algal blooms.