Sierra Vista Environmental Operations Park

The City of Sierra Vista Environmental Operations Park (EOP) is located at Sierra Vista’s wastewater treatment facility off Highway 90 between mileposts 324 and 325, and on the west side of the San Pedro River. The project recharges the city of Sierra Vista’s A-quality treated effluent and is raising groundwater levels in a critical area that is both supporting San Pedro River flows and protecting the river from municipal groundwater pumping centers. Through the EOP’s eleven recharge basins an average 2,000 acre-feet is recharged annually, plus another 700 acre-feet incidental recharge occurs in the EOP wetlands. The annual treated effluent recharge is between approximately 2,700 and 2,900 acre-feet. Project operation began in 2002, with groundwater monitoring beginning that same year, and is ongoing.

Sierra Vista’s A quality treated effluent is recharged into basins at the city’s wastewater treatment facility, at the Environmental Operation Park (EOP). (photo credit City of Sierra Vista)


The mission of the Cochise Conservation & Recharge Network (CCRN) is to implement a regional network of land and water management projects that result in a healthy watershed, flowing San Pedro River, conservation of water resources, and a vibrant local economy.

Member Organizations

The CCRN was formed in 2015, and includes Cochise County, the City of Sierra Vista, The Nature Conservancy, Hereford Natural Resources Conservation District, the City of Bisbee, and Fort Huachuca.