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

Normal Business Hours
8:00am-5:00pm
Monday-Friday

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

E-mail Union Sanitary District
[email protected]
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 [email protected]

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