Marana WWTF - Advanced Wastewater Treatment in Marana, Arizona

Marana WWTF is an advanced wastewater treatment facility located in Marana, Pima County, Arizona. Serving a population of 4,860, the plant is part of the municipal infrastructure that supports this growing community in the Sonoran Desert region. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other contaminants. With a designed capacity of 13,494.95 volume units and a current discharge volume of 832.79, the facility operates well below its capacity. As a U.S. plant, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Arizona Department of Environmental Quality. The treated effluent from Marana WWTF discharges into the Santa Cruz River watershed, which flows south into Mexico and eventually contributes to the Gulf of California. The plant's advanced treatment helps protect the fragile desert riparian ecosystem and supports water quality in the region, which is important for both wildlife and downstream water users.

The plant discharges into the Santa Cruz River basin, a vital watercourse in the Sonoran Desert that supports diverse aquatic and riparian life. The river flows through arid landscapes and is a critical migratory corridor for birds. Downstream, the Santa Cruz River joins the Gila River, which ultimately drains into the Colorado River and the Gulf of California. Advanced treatment at this plant helps reduce nutrient loading and protects the ecological health of this sensitive desert watershed.