Washington WWTP - Municipal Wastewater Treatment in Washington, Missouri

Washington WWTP is a municipal wastewater treatment facility located in Washington, Franklin County, Missouri, United States. The plant serves a population of about 14,082 residents, classifying it as a medium-sized agglomeration under US EPA guidelines. As a US facility, Washington WWTP operates under the Clean Water Act's National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. Plants of this scale typically employ secondary treatment as a minimum standard. The plant's treated effluent is discharged into the Missouri River basin, which flows into the Mississippi River and ultimately the Gulf of Mexico. This discharge contributes to the overall nutrient load in the Mississippi River watershed, a region of significant ecological concern due to the Gulf of Mexico hypoxic zone.

Washington WWTP discharges into the Missouri River watershed, which drains into the Mississippi River and then the Gulf of Mexico. The receiving waters support diverse aquatic life and are part of a major migratory corridor for fish and birds. Nutrient management is critical in this basin due to its contribution to the Gulf of Mexico hypoxic zone.