Utilities Administration

6040 Vaca Station Road
Elmira, CA 95625

Administration Phone
(707) 469-6400

Utility Billing
(707) 449-5128

Fax
(707) 469-6480

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Wastewater Treatment

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Wastewater from homes and businesses throughout the City is collected and sent through a network of sewer lines to the Easterly Wastewater Treatment Plant. At the treatment plant, City staff work to remove as many pollutants from the wastewater as possible. This is important to minimize the risk to public health and the impact on the environment.

Utilities Wastewater Operations

Utilities Wastewater Operations is responsible for the operation and oversight of the City of Vacaville’s Easterly Wastewater Treatment Plant. The plant is a 24/7 industrial facility that uses complex processes to treat wastewater before it is released into Alamo Creek, treating an average of 7.5 million gallons of wastewater each day. The plant operates under a National Pollutant Discharge Elimination System (NPDES) permit issued and regulated by the Central Valley Regional Water Quality Control Board to provide Title 22 tertiary level treatment. Over 3.2 billion gallons of wastewater were treated in 2024.

From May 1 to October 31, the Easterly plant is required to produce Title 22 recycled water. The City adopted a Recycled Water Master Plan in 2021, which opens up opportunities to increase the region’s water supply with a sustainable and reliable alternative to surface water and groundwater.

Easterly Wastewater Treatment Plant Permit

Vacaville, CA

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Utilities Administration

Wastewater Treatment