PCRWRD Arivaca Junction WWTF - Secondary Wastewater Treatment in Santa Cruz County, Arizona

The PCRWRD Arivaca Junction WWTF is a municipal wastewater treatment facility located in Santa Cruz County, Arizona, serving a population of approximately 1,090 residents. The plant provides secondary treatment, a standard level for small communities in the United States, ensuring that effluent meets basic environmental standards before discharge. With a designed capacity of 378.54 m³/day and an average daily flow of 189.27 m³/day, the plant operates at about 50% of its capacity. As a facility in the United States, it operates under the Clean Water Act, with National Pollutant Discharge Elimination System (NPDES) permits issued by the Arizona Department of Environmental Quality, which set limits on effluent quality to protect receiving waters. The plant's treated effluent is discharged into local waterways that ultimately drain into the Santa Cruz River watershed, which flows south into Mexico and eventually into the Gulf of California. The region's arid climate makes water quality management critical for sustaining local aquatic habitats and downstream ecosystems.

The plant discharges into the Santa Cruz River watershed, which flows through southern Arizona and into Sonora, Mexico, before reaching the Gulf of California. This arid region relies on treated wastewater to maintain base flows in the river, supporting riparian habitats and wildlife. The Santa Cruz River is an important migratory corridor for birds and sustains diverse aquatic life in an otherwise dry landscape.