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Wastewater Treatment Plant and Administration Building
5072 Benson Road
Union City, CA 94587-2508
(510) 477-7500
(510) 477-7501 Fax

Normal Business Hours

After hours/Emergency
(510) 477-7500, press extension 1

E-mail Union Sanitary District
If you have an emergency or need immediate assistance, please call (510) 477-7500. We answer our phones 24/7/365.

The ContactUSD email is not for solicitation purposes (see: Doing Business with USD). If you request a response through the ContactUSD email, we will respond within 3 business days. PLEASE NOTE: The ContactUSD email account is NOT monitored on weekends or holidays.

For questions regarding the permitting process or to submit sewer permit applications, please email

Union Sanitary District is committed to ensuring the accessibility of its facilities to persons with disabilities, including accessibility to our website. Learn More

Current Job Openings
Please see Job Opportunities to learn more about Current Openings.



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5072 Benson Road

Union City, CA 94587-2508

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