Marion WWTP - Secondary Treatment Plant in Marion, Texas

Marion WWTP is a municipal wastewater treatment plant located in Marion, Texas, serving a population of approximately 1,160 residents. The facility operates under the regulatory framework of the US Clean Water Act, which governs wastewater discharges through the National Pollutant Discharge Elimination System (NPDES) permit program. As a secondary treatment plant, it meets the standard level of treatment required for most municipal facilities in the United States. The plant has a designed capacity of 757.08 thousand cubic meters and currently treats an annual discharge volume of 264.98 thousand cubic meters, indicating operational capacity well below its design limit. Secondary treatment typically involves biological processes to remove organic matter and suspended solids. The plant's operations are subject to state and federal oversight to ensure compliance with water quality standards. The treated effluent from Marion WWTP is discharged into local waterways that ultimately drain into the Guadalupe River basin, which flows into the San Antonio Bay and the Gulf of Mexico. The Guadalupe River supports diverse aquatic life and provides habitat for fish and wildlife species. The plant's location inland, away from the coast, reduces direct marine impact, but its discharge contributes to the overall water quality of the regional watershed.

Marion WWTP discharges into the Guadalupe River basin, which flows through south-central Texas before emptying into San Antonio Bay and the Gulf of Mexico. The Guadalupe River supports a variety of aquatic species and is an important water resource for the region. The plant's secondary treatment helps protect downstream water quality by reducing organic pollutants and suspended solids before discharge.