Coolidge WWTP - Secondary Wastewater Treatment in Coolidge, Texas

Coolidge WWTP is a municipal wastewater treatment plant located in Coolidge, Limestone County, Texas. The facility serves a small population of around 860 residents, reflecting the rural character of the area. As a secondary treatment plant, it provides biological treatment to reduce organic pollutants and suspended solids before discharge. The plant has a designed capacity of 378.54 cubic meters per day and currently treats an average daily flow of 264.98 cubic meters, operating below its full capacity. Under the U.S. Clean Water Act, the facility operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Texas Commission on Environmental Quality, which sets effluent limits to protect water quality. The treated effluent is discharged into local streams that ultimately flow into the Brazos River, a major waterway in Texas. The Brazos River supports diverse aquatic life and provides water for irrigation, recreation, and municipal supply downstream. The plant's location inland and its secondary treatment level help mitigate risks to sensitive coastal environments.

The plant discharges into tributaries of the Brazos River, which flows southeast through Texas to the Gulf of Mexico. The Brazos River basin supports a variety of fish and wildlife, including several species of freshwater mussels and migratory birds. The river's health is important for downstream communities and ecosystems, making proper wastewater treatment essential to prevent nutrient pollution and maintain water quality.