Backflow testing & repair in San Ramon, CA
San Ramon (Contra Costa County) gets its water from 2 suppliers, and the one on your water bill sets your backflow rules:
- East Bay Municipal Utility District: you hire a certified tester. We test, file the results with EBMUD, and repair failed devices.
- Dublin San Ramon Services District: you hire a certified tester. We test, file the results with DSRSD, and repair failed devices.
- County
- Contra Costa County
- Water suppliers
- East Bay Municipal Utility District; Dublin San Ramon Services District
- Annual test
- EBMUD: owner hires a certified tester and DSRSD: owner hires a certified tester
- Our price
- $199 per device ($25 off for new customers), or from $180/year on a plan
- ZIP codes
- 94582, 94583
EBMUD rules for San Ramon customers
- Testers must be certified as a General Backflow Tester by AWWA, ABPA, NCBPA or ASSE and also pass an EBMUD exam.
- The completed test form is due by mail within 30 days of EBMUD’s notification.
- Since July 1, 2025, customers with a private well must test annually and submit the results (EBMUD Regulations, Section 26).
Source: EBMUD backflow program (official page), checked October 17, 2026.
DSRSD rules for San Ramon customers
- DSRSD requires annual testing and mails notices listing each assembly, its serial number, location and due date.
- Results for existing devices are submitted through the Tokay test entry website.
- Testers must be certified by AWWA, NCBPA or a similar District-approved program.
- DSRSD charges a bimonthly administration fee to customers who are required to have a backflow device.
Source: DSRSD backflow program (official page), checked October 17, 2026.
Rules for new and replacement devices in San Ramon
EBMUD
- The customer must install, test and maintain the required device and pays all of its costs.
Source: EBMUD backflow program (official page).
DSRSD
- Commercial, industrial, irrigation and multi-family services need a reduced pressure (RP) assembly; fire lines need at least a double check detector assembly.
Source: DSRSD backflow program (official page).
Installing or replacing a device takes a licensed plumbing contractor, usually with a permit. We can refer you to one we trust, test the new device once it’s in, and make minor repairs to existing ones.
Backflow questions from San Ramon property owners
Which water supplier serves San Ramon?
San Ramon is split between East Bay Municipal Utility District and Dublin San Ramon Services District. Your water bill names your supplier, and its notice sets your backflow rules.
Who tests backflow devices for EBMUD customers in San Ramon?
The property owner hires a certified tester, and the test must be performed by a tester on EBMUD’s approved backflow testers list.
Who tests backflow devices for DSRSD customers in San Ramon?
DSRSD employees don’t test backflow devices: customers hire a tester from the District’s approved list.
When is the backflow test due in San Ramon for EBMUD customers?
The completed test form is due by mail within 30 days of EBMUD’s notification.
When is the backflow test due in San Ramon for DSRSD customers?
DSRSD requires annual testing and mails notices listing each assembly, its serial number, location and due date.