Pomona WRP - Wastewater Treatment Plant in Pomona, California

Pomona WRP is a municipal wastewater treatment plant located in Pomona, Los Angeles County, California. It serves a population of approximately 162,200, placing it in the large agglomeration category for US facilities. The plant is situated inland, about 50 km from the coast, and its treated effluent ultimately drains toward the Pacific Ocean via the Los Angeles River watershed. As a large-scale facility in California, Pomona WRP is expected to provide at least secondary treatment under the US Clean Water Act, with potential nutrient removal requirements to protect downstream water quality. The plant's designed capacity is 1.00 (likely million gallons per day or similar unit), indicating a substantial infrastructure footprint. Regulatory oversight is provided by the US EPA and the California State Water Resources Control Board through NPDES permits. The plant's discharge contributes to the local hydrology, eventually reaching the Los Angeles River and then the Pacific Ocean. This watershed supports diverse aquatic life and is an important ecological corridor in Southern California. The plant's performance is critical for maintaining water quality in the region's urbanized environment.

Pomona WRP discharges treated effluent into the Los Angeles River watershed, which flows through Los Angeles County before reaching the Pacific Ocean at Long Beach. The river and its tributaries provide habitat for native fish and bird species, and the coastal zone supports marine ecosystems. The plant's operations help reduce nutrient and pollutant loads in this heavily urbanized basin, protecting downstream water quality and recreational uses.