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City of Surprise - SPA 2 Facility

Location: Surprise, Arizona
Project Type: Design-Build-Operate
Capacity: 1.2 MGD expandable to 2.4 MGD
Footprint: 0.75 acres
Process Design: Hybrid Sequencing Batch Reactor (SBR)

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The City of Surprise has been named Arizona’s fastest-growing city and was challenged to provide the necessary infrastructure to support this growth. The developers and home builders of Special Planning Areas (SPA) 2, 3, 4, and 5 knew it would be years before the City of Surprise could provide water and sewer services for new developments, so they began searching for an immediate wastewater solution.

The City, developers and home builders contracted with PERC Water to design, build, and operate four new regional water recycling facilities to support SPA 2, 3, 4, and 5. We have completed construction on both SPA 2 and SPA 3 and have designed and obtained the permits for SPA 4 and SPA 5.

SPA 2 is one of eight PERC Water recycling facilities in Maricopa County, Arizona. Phase I of SPA 2 was completed in September 2007 and provides 1.2 MGD of treatment capacity. Possible future expansions would allow for a capacity to 2.4 MGD. Similar to SPA 3, this facility was designed to treat low initial flows and will eventually support approximately 4,800 homes and, after expansion, 9,600 homes.

For more details on the SPA 2 Water Recycling Facilities, including key design features, please contact us at