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Treatment Plant

Wastewater Operations is responsible for the operation, maintenance, and oversight of the City of Vacaville’s Easterly Wastewater Treatment Plant (WWTP). The plant operates 24/7 and treats an average of 10 million gallons of wastewater per day (10 MGD) and has an average dry weather treatment capacity of 15 MGD. The plant operates under a National Pollutant Discharge Elimination System (NPDES) permit issued and regulated by the Central Valley Regional Water Quality Control Board (Regional Board) to provide tertiary level treatment.

Treated wastewater (effluent) is released into Alamo Creek, where it travels to Cache Slough, and eventually out to the Delta.

In addition to operating the Easterly WWTP, Wastewater Operations actively participates in a preventative maintenance program designed to minimize required maintenance and repair; works with Utilities Engineering on design and design review of special projects such as the Tertiary Project; updates and maintains all systems manuals for reference and operation; treats and disinfects biosolids which are then taken to the landfill and used as cover material; and administers the volunteer operator-in-training certification program.

In 2016, Wastewater Operations:

  • Successfully treated over 2.6 billion gallons of wastewater
  • Safely handled over 500,000 gallons of sodium hypochlorite and 146,000 gallons of sodium bisulfite without any harm to people, property, or the environment
  • Completed over 1,100 preventive maintenance work orders
  • Dewatered, spread, dried, and hauled 1,600 wet tons of biosolids.

 Jeff Cooley
 Utilities Operations Manager      707-469-6400
 Tim Erskine
 Chief Plant Operator  707-469-6400