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Easterly WWTP (002)         Plt Tour Info 

Wastewater Operations is responsible for the operation and oversight of the City of Vacaville’s Easterly Wastewater Treatment Plant (WWTP). The plant operates 24/7 and treats an average of 7.5 million gallons of wastewater per day 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 Title 22 tertiary level treatment. The plant successfully treated over 2.8 billion gallons in 2018 without a NPDES violation.

The City of Vacaville Easterly Wastewater Treatment Plant serves the City of Vacaville, the Community of Elmira, the California Medical Facility, and most of the Vaca Valley Industrial Park. The plant is located just south of Old Alamo Creek and the Solano Irrigation District's Dally Canal at the end of Vaca Station Road, east of Elmira.

The Easterly Wastewater Treatment Plant is a state-of-the-art wastewater treatment plant that utilizes many complex processes to produce treated wastewater and Title 22 recycled water. Wastewater undergoes primary, secondary and tertiary treatment and disinfection before being released into Alamo Creek, where it travels to Cache Slough, and eventually out to the Delta.

Wastewater that enters the treatment plant (influent) is about 99% water and 1% solids. The wastewater flows through a series of treatment processes that screen out large solids, remove smaller solids that sink or float, and then removes smaller materials that are dissolved in the wastewater. This treatment process involves physical, chemical and biological treatment techniques.

From May 1st to October 31st, the Easterly plant is required to produce Title 22 recycled water.  The Utilities Department is currently working on a Recycled Water Master Plan which could open the opportunity to further increase the region’s water supply with a sustainable and reliable alternative.

 Tim Erskine
 Chief Plant Operator  707-469-6400