Caldwell Borough CS_STP Wastewater Treatment Plant, West Caldwell, New Jersey

Caldwell Borough CS_STP is a municipal wastewater treatment plant located in West Caldwell, Essex County, New Jersey, United States. It serves an estimated population of 32,215, placing it in the medium-agglomeration category for US facilities. The plant is situated inland, more than 50 km from the Atlantic coast, and its operations are subject to federal and state environmental regulations. As a US-based plant, Caldwell Borough CS_STP operates under the Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. Plants of this scale typically employ secondary treatment as a minimum standard, with potential for advanced treatment depending on local water quality requirements. The designed capacity is reported at 1.00 (likely in million gallons per day or similar unit), indicating a facility sized for the community's needs. The plant's treated effluent is discharged into local waterways that ultimately drain into the Passaic River basin, which flows into Newark Bay and then the Atlantic Ocean. This watershed supports diverse aquatic life and provides recreational and ecological value to the region. The plant plays a key role in protecting water quality in the densely populated New Jersey area.

The treated effluent from Caldwell Borough CS_STP enters the Passaic River watershed, which flows through northern New Jersey into Newark Bay and eventually the Atlantic Ocean. This river system supports a variety of fish species and is an important migratory corridor for birds. The plant's discharge contributes to maintaining water quality in a region with significant urban and industrial activity, helping to protect downstream ecosystems and recreational uses.