Central Contra Costa Sanitary District (Central San) is a public utility agency that provides wastewater collection, treatment, and disposal services to approximately 500,000 residents and businesses in central Contra Costa County, California. Established in 1946, the district serves multiple communities including Alamo, Clayton, Danville, Lafayette, Martinez, Moraga, Orinda, Pleasant Hill, San Ramon, and Walnut Creek. The district operates a water treatment plant in Martinez, California, which processes an average of 32 million gallons of wastewater per day. The facility employs advanced treatment technologies to meet strict environmental standards before discharging treated water into Suisun Bay. Central San also maintains approximately 1,500 miles of sewer pipelines and 18 pumping stations throughout its service area. Beyond its core wastewater services, Central San operates a Household Hazardous Waste Collection Facility and provides recycled water for irrigation and industrial uses. The district is recognized for its environmental education programs, including treatment plant tours and school outreach initiatives. Central San is governed by a five-member Board of Directors, elected by voters within the district’s service area. The agency operates as a special district under California law and is funded primarily through service charges and property taxes.