About Central San

Treatment Plant

We’re your friendly neighborhood sewer utility… and so much more!

The Central Contra Costa Sanitary District (Central San) has been protecting public health and the environment since 1946 by collecting and treating wastewater from approximately 476,400 residents and 3,000 businesses in central Contra Costa County, California.

70th Logo

This year marks our 70th Anniversary!

Our headquarters is located at:
5019 Imhoff Place, Martinez, CA 94553

Map of service area
Our service area

Our service area includes Alamo, Clayton, Concord, Danville, Lafayette, Moraga, Orinda, Pacheco, Pleasant Hill, Walnut Creek; portions of Martinez and San Ramon; and unincorporated communities with the central County area.

Whatever goes down your drains travels through our 1500-mile sewer system to our wastewater treatment plant near the corner of Interstate 680 and Highway 4 in Martinez CA. We treat and disinfect about 35.6 million gallons of wastewater every day. Most of that treated water goes into Suisun Bay, but some of it receives further processing to produce nearly 2 million gallons of recycled water daily for landscape irrigation and industrial use.

We also operate a Household Hazardous Waste Collection Facility and Residential Recycled Water Fill Station, and sponsor several pharmaceutical collection/disposal sites within the communities we serve.

CCCSD logo


Follow the Flow

Here’s an overview of what we do to make wastewater clean:


Maintaining the Flow

Here’s an overview of how we maintain the public sewer system:


Please visit our website for more information: CentralSan.org.

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