Great Salt Bay Water Pollution Control Facility - Damariscotta, Maine Wastewater Treatment

Great Salt Bay Water Pollution Control Facility (WPCF) is a municipal wastewater treatment plant located in Damariscotta, Lincoln County, Maine, United States. The plant serves a small community of approximately 1,503 residents and operates under the regulatory framework of the U.S. Clean Water Act, which governs wastewater discharges through the National Pollutant Discharge Elimination System (NPDES) permit program. The facility provides secondary treatment, a standard level required for most municipal plants in the U.S. to reduce organic matter and suspended solids. Its designed capacity is 1,014.49 (likely in million gallons per day or similar), while the actual discharge volume is 529.96, indicating operational headroom. The plant is situated within 10 km of the coast, making its discharge potentially influential on nearby estuarine or marine environments. Treated effluent from the plant likely enters the Damariscotta River estuary, which flows into the Gulf of Maine and ultimately the Atlantic Ocean. This region supports diverse aquatic life, including shellfish beds and migratory fish species, and is ecologically sensitive to nutrient loading and pollutant inputs. The plant's secondary treatment helps mitigate these impacts, though coastal proximity increases the importance of effective nutrient removal.

The plant discharges into the Damariscotta River, a tidal estuary that drains into the Gulf of Maine, part of the larger Atlantic Ocean basin. The estuary supports critical habitats for shellfish (e.g., oysters, clams) and serves as a nursery for finfish. Nutrient inputs from wastewater can contribute to algal blooms and oxygen depletion, making treatment performance important for maintaining water quality in this ecologically productive coastal system.