PRINCETON STP - Princeton, Illinois Wastewater Treatment Plant

PRINCETON STP is a municipal wastewater treatment plant located at 1588 West Clark Street in Princeton, Illinois, serving a population of about 7,555. The plant operates under the regulatory framework of the United States Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges into surface waters. As a facility serving a small agglomeration, it is subject to secondary treatment standards and monitoring requirements set by the Illinois Environmental Protection Agency. Facilities of this scale in the U.S. typically employ secondary treatment processes such as activated sludge or trickling filters. The Clean Water Act mandates that publicly owned treatment works achieve effluent limitations based on secondary treatment, which removes at least 85% of biochemical oxygen demand and total suspended solids. The treated effluent from PRINCETON STP ultimately drains into the Illinois River watershed, which flows into the Mississippi River and then to the Gulf of Mexico. This water body supports diverse aquatic life and is an important migratory corridor for fish and birds. The plant's discharge contributes to the overall water quality in the region, and its operation is critical for protecting downstream ecosystems.

PRINCETON STP discharges into the local watershed, which is part of the Illinois River basin. The Illinois River flows into the Mississippi River, which empties into the Gulf of Mexico. This downstream chain supports a variety of aquatic species and provides habitat for migratory birds. The plant's discharge must meet water quality standards to protect these ecosystems.