Central Contra Costa Sanitary District

Central Contra Costa Sanitary District Providing wastewater collection & cleaning to nearly 500,000 in the East Bay. 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. Today we collect and clean wastewater from nearly 500,000 residents and more than 15,000 businesses in central Contra Costa County, California. Whatever goes down your drains travels through our 1,500-mile sewer system to our treatment plant in Martinez, where we clean about 1

3 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

We welcome your comments! Our social media comment guidelines are available at: centralsan.org/socialmedia

Curious about what happens to your dirty water after it goes down the drain?🚽🛁Join us for a FREE public tour on Thursday...
09/10/2026

Curious about what happens to your dirty water after it goes down the drain?🚽🛁

Join us for a FREE public tour on Thursday, September 24, at 4 PM to discover how we collect and clean over 13 billion gallons of wastewater every year! We'll enjoy a behind-the-scenes walking tour of Central San’s award-winning wastewater treatment plant.

Please note that tour attendees must be 10 years or older. Children under 18 must be accompanied by an adult.

To register, visit: centralsan.org/tours

09/08/2026

Thank you to everyone who joined us this summer for Central San’s 80th Anniversary Open House! We had a fantastic time sharing our work and celebrating this milestone with our customers, neighbors, community partners, and friends. Check out our highlights reel from this special day!

Planning a getaway for the long weekend? Be sure to plan a stop at Central San’s RV Waste Disposal Station!Open 24/7, ou...
09/03/2026

Planning a getaway for the long weekend? Be sure to plan a stop at Central San’s RV Waste Disposal Station!

Open 24/7, our self-service station provides a free, convenient way to safely dispose of your RV wastewater.

For directions and details, visit: centralsan.org/rv

Happy travels! 🚐

We’re very proud to share that Central San was recently honored with the Peak Performance Award - Platinum 28 from the N...
09/01/2026

We’re very proud to share that Central San was recently honored with the Peak Performance Award - Platinum 28 from the National Association of Clean Water Agencies (NACWA). The award recognizes our 28 consecutive years of 100% permit compliance.

Our team works tirelessly 24/7/365 to protect public health and the environment. Congratulations to everyone on this remarkable achievement!

Happy National Toilet Paper Day! 🧻Today, we celebrate that humble hero of the bathroom: toilet paper! Not only is TP a h...
08/26/2026

Happy National Toilet Paper Day! 🧻

Today, we celebrate that humble hero of the bathroom: toilet paper! Not only is TP a household staple, but it’s also designed to break down after flushing, making it safe for our sewer system.

In contrast, wipes are mostly made of plastic. They remain intact as they travel through our system, where they can clog pipes and damage our equipment.

So, when it comes to what to flush, stick with the classic. Here’s to toilet paper for helping to keep our sewer system working well!

Please join us in welcoming our fall 2026 Central San Interns! These students and recent graduates will spend the next s...
08/26/2026

Please join us in welcoming our fall 2026 Central San Interns! These students and recent graduates will spend the next six months growing their skills in the field and office. We can’t wait to see all the amazing things they accomplish!

Central San’s internship program offers well-paid, hands-on experience and career exploration opportunities. To learn more, please visit: https://www.centralsan.org/post/summer-student-and-internship-programs

It’s back-to-school season, and we’re excited to get back in the classroom! Our award-winning, hands-on education progra...
08/18/2026

It’s back-to-school season, and we’re excited to get back in the classroom! Our award-winning, hands-on education programs are free for teachers, schools, and families. Tell your favorite teacher and help us spread the word!

Learn more at: centralsan.org/learn

August is National Water Quality Month! Did you know that Central San conducts thousands of laboratory tests every month...
08/13/2026

August is National Water Quality Month! Did you know that Central San conducts thousands of laboratory tests every month to ensure the water we return to the environment is safe and clean? 💧🌎

You can help! Please keep wipes, trash, oil, paint, and other pollutants out of toilets and drains. Learn more at: centralsan.org/residents-pollution-prevention

We had a fantastic time at Bay Day hosted by Exploratorium earlier this month! Central San, along with our partners from...
08/12/2026

We had a fantastic time at Bay Day hosted by Exploratorium earlier this month!

Central San, along with our partners from Bay Area Clean Water Agencies (BACWA), shared hands-on activities and information about the work we do every day to protect our environment.

Thanks to everyone who stopped by our table! It was wonderful to meet so many kids and families who are dedicated to keeping our Bay healthy.

Happy 811 Day!August 11 (8/11) serves as an annual reminder to always call 811 before starting any digging project, big ...
08/11/2026

Happy 811 Day!

August 11 (8/11) serves as an annual reminder to always call 811 before starting any digging project, big or small! 🪏

Hitting a buried utility line can have serious consequences, from disrupting essential services to causing severe injury. By calling 811, you help protect underground utilities, prevent costly repairs, and keep yourself safe.

To learn more, visit: call811.com

Address

5019 Imhoff Place
Martinez, CA
94553

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

Telephone

+19252289500

Website

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