Central Contra Costa Sanitary District Information

The Central Contra Costa Sanitary District (Central San) has been protecting public health and the environment since 1946. Today we collect and clean wastewater from nearly 500,000 residents and more than 15,000 businesses on over 3,000 parcels in central Contra Costa County, California. Whatever goes down our customers’ drains travels through our 1,500-mile sewer system to our treatment plant in Martinez, where we clean about 13 billion gallons of wastewater every year. We also operate a popular Household Hazardous Waste Collection Facility, provide recycled water for landscape irrigation and industrial use, and promote pollution prevention through a variety of education, outreach, and inspection programs. Please visit our website for more information about Central San: centralsan.org