Brazoria Co MUD 21 Wastewater Treatment Plant, Alvin, Texas

Brazoria Co MUD 21 is a municipal wastewater treatment plant located in Alvin, Brazoria County, Texas, United States. The plant serves a population of approximately 2,000 residents and operates under the regulatory framework of the US Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. The plant provides advanced treatment, which goes beyond secondary treatment to remove nutrients and other pollutants. Its designed capacity is 946.35 cubic meters per day, with a similar discharge volume, indicating full utilization. Advanced treatment is typical for plants in sensitive watersheds or those requiring high effluent quality. The treated effluent is discharged into local streams that flow into the Brazos River basin, eventually reaching the Gulf of Mexico. This region supports diverse aquatic life and is important for coastal ecosystems. The plant's advanced treatment helps protect downstream water quality and ecological health.

The plant discharges into tributaries of the Brazos River, which flows into the Gulf of Mexico. The Brazos River basin supports diverse aquatic habitats and is an important migratory corridor for fish and birds. The Gulf of Mexico coastal zone is ecologically sensitive, with estuaries and wetlands that rely on clean freshwater inflows. Advanced treatment at this plant helps reduce nutrient loading and protect downstream marine environments.