SAN LUIS SBR WEST Wastewater Treatment Plant, San Luis, Arizona

SAN LUIS SBR WEST is a municipal wastewater treatment plant located on Cesar Chavez Boulevard in San Luis, Arizona, within Yuma County. The plant serves a population of approximately 24,888 residents, placing it in the medium-agglomeration category for US wastewater infrastructure. As a US-based facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting, typically administered by the Arizona Department of Environmental Quality. For a plant serving this population size, secondary treatment is the minimum standard, with potential requirements for additional nutrient removal depending on the receiving water body's sensitivity. The plant's treated effluent likely discharges to a local waterway that drains into the Colorado River basin, ultimately reaching the Gulf of California. The region's arid climate and proximity to the US-Mexico border make water quality management critical for both agricultural and ecological uses downstream.

The plant is located in the Lower Colorado River watershed, a critical water source for agriculture and ecosystems in the arid Southwest. Treated effluent likely flows into the Colorado River, which supports diverse aquatic life and provides water for millions of people. The river ultimately drains into the Gulf of California, a biologically rich marine environment. The region's water scarcity heightens the importance of effective wastewater treatment to protect downstream water quality.