Environmental Operations Park (EOP) – Preserving Sierra Vista's Resources |
Two decades ago when the city's sewage treatment facility was originally designed, treated sewage was looked upon as something to dispose of - hence the term “wastewater.” 
Times have certainly changed, now wastewater is called effluent and it is recognized as the valuable commodity. Sierra Vista's Environmental Operations Park (EOP), processes effluent without the addition of any chemicals or the use of ultraviolet light and returns it to the underground aquifer through a natural process.
Last year, this facility recharged nearly twice as much water as Fort Huachuca used in the entire year!
In 2007, the EOP returned 2000 acre-feet of water to the aquifer. To put that number in perspective, for the entire year of 2007, Fort Huachuca used less than 1,300 acre-feet of water, so returning 2,000 acre-feet to the aquifer is an valuable tool for sustaining water in the sub basin and it makes the EOP, by far, the largest water mitigation project in the basin. Since operations began in 2002, the EOP has recharged almost 11,000 acre-feet of water…more than 3.5 million gallons!
The EOP consists of 50 acres of constructed wetlands (30 acres are recharge basins) along with native grasses. 
The best part of the natural process is that the City facility provides an inviting habitat for birds and wildlife. There is a convenient 1,800-square-foot wildlife-viewing platform with tables, benches, and native landscaping located near the wetlands for bird and wildlife enthusiasts. Both the City's yard waste composting facility and the County's regional solid waste transfer station are also located at the EOP.
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All data reported by the City of Sierra Vista on this website has been provided by the agencies and groups responsible for water management within the Upper San Pedro sub-basin and reviewed by the Upper San Pedro Partnership. All information is consistent with the information provided by those agencies to the USGS for inclusion in the 2008 Section 321 Report to Congress.