Service areas and water districts
Backflow testing is required by your water supplier, and each one sets its own rules: who may test, deadlines, and how results are filed. Find your city, or the water district named on your notice.
Santa Clara County
Cities
- Campbell
- Cupertino
- Gilroy
- Los Altos
- Los Altos Hills
- Los Gatos
- Milpitas
- Morgan Hill
- Mountain View
- Palo Alto
- San Jose
- Santa Clara
- Saratoga
- Sunnyvale
Water districts
- California Water Service – Los Altos Suburban District · testing & minor repairs
- City of Gilroy Water · testing & minor repairs
- City of Milpitas Water · testing & minor repairs
- City of Morgan Hill Water · testing & minor repairs
- City of Mountain View Water · district tests; we make minor repairs
- City of Santa Clara Water & Sewer Utilities · testing & minor repairs
- City of Sunnyvale Water · testing & minor repairs
- Great Oaks Water Company · testing & minor repairs
- City of Palo Alto Utilities · testing & minor repairs
- Purissima Hills Water District · district tests; we make minor repairs
- San José Municipal Water System · testing & minor repairs
- San Jose Water · district tests; we make minor repairs
San Mateo County & San Francisco
Cities
- Atherton
- Belmont
- Brisbane
- Burlingame
- Daly City
- East Palo Alto
- Foster City
- Hillsborough
- Menlo Park
- Millbrae
- Pacifica
- Redwood City
- San Bruno
- San Carlos
- San Francisco
- San Mateo
- South San Francisco
Water districts
- California Water Service – Bayshore District · testing & minor repairs
- California Water Service – Bear Gulch District · testing & minor repairs
- City of Brisbane / Guadalupe Valley Municipal Improvement District · testing & minor repairs
- City of Burlingame Water · testing & minor repairs
- City of Millbrae Water · testing & minor repairs
- City of Redwood City Water · testing & minor repairs
- City of San Bruno Water · testing & minor repairs
- Daly City Department of Water & Wastewater Resources · testing & minor repairs
- East Palo Alto water service · testing & minor repairs
- Estero Municipal Improvement District · testing & minor repairs
- Menlo Park Municipal Water · testing & minor repairs
- Mid-Peninsula Water District · testing & minor repairs
- North Coast County Water District · testing & minor repairs
- San Mateo County Environmental Health Services – Cross-Connection Control Program · testing & minor repairs
- San Francisco Public Utilities Commission · testing & minor repairs
- Town of Hillsborough Water · testing & minor repairs
East Bay, Tri-Valley & Tracy
Cities
- Alamo
- Castro Valley
- Danville
- Dublin
- Fremont
- Hayward
- Livermore
- Newark
- Oakland
- Pleasanton
- San Leandro
- San Ramon
- Tracy
- Union City
- Walnut Creek
Water districts
- Alameda County Water District · testing & minor repairs
- California Water Service – Livermore District · testing & minor repairs
- City of Hayward Water System · district tests; we make minor repairs
- City of Pleasanton Water · testing & minor repairs
- City of Tracy Water · testing & minor repairs
- Dublin San Ramon Services District · testing & minor repairs
- East Bay Municipal Utility District · testing & minor repairs
- Livermore Municipal Water · testing & minor repairs
Santa Cruz, Monterey & San Benito
Cities
- Capitola
- Carmel-by-the-Sea
- Hollister
- Monterey
- Pacific Grove
- Salinas
- Sand City
- Santa Cruz
- Seaside
- Soquel
- Watsonville
Water districts
- California American Water – Monterey County District · testing & minor repairs
- California Water Service – Salinas District · testing & minor repairs
- City of Hollister Water · testing & minor repairs
- City of Watsonville Water · testing & minor repairs
- City of Santa Cruz Water Department · testing & minor repairs
- Soquel Creek Water District · testing & minor repairs
Who tests backflow devices in each water district?
Most suppliers require the property owner to hire a certified backflow tester every year. A few test devices themselves; there,BackflowCare makes minor repairs but doesn’t offer the test.
| Water district | Who tests | Cities |
|---|---|---|
| ACWD | Owner hires a certified tester | Fremont, Newark, Union City |
| Cal Am Monterey | Owner hires a certified tester | Monterey, Carmel-by-the-Sea, Pacific Grove, Seaside, Sand City |
| Cal Water Bayshore | Owner hires a certified tester | Daly City, South San Francisco, San Mateo, San Carlos |
| Cal Water Bear Gulch | Owner hires a certified tester | Redwood City, Atherton, Menlo Park |
| Cal Water Livermore | Owner hires a certified tester | Livermore |
| Cal Water Los Altos | Owner hires a certified tester | Cupertino, Los Altos, Los Altos Hills, Mountain View, Sunnyvale |
| Cal Water Salinas | Owner hires a certified tester | Salinas |
| City of Brisbane | Owner hires a certified tester | Brisbane |
| City of Burlingame | Owner hires a certified tester | Burlingame |
| City of Gilroy | Owner hires a certified tester | Gilroy |
| City of Hayward | The district tests devices itself | Hayward |
| City of Hollister | Owner hires a certified tester | Hollister |
| City of Millbrae | Owner hires a certified tester | Millbrae |
| City of Milpitas | Owner hires a certified tester | Milpitas |
| City of Morgan Hill | Owner hires a certified tester | Morgan Hill |
| City of Mountain View | The district tests devices itself | Mountain View |
| City of Pleasanton | Owner hires a certified tester | Pleasanton |
| City of Redwood City | Owner hires a certified tester | Redwood City |
| City of San Bruno | Owner hires a certified tester | San Bruno |
| City of Santa Clara | Owner hires a certified tester | Santa Clara |
| City of Sunnyvale | Owner hires a certified tester | Sunnyvale |
| City of Tracy | Owner hires a certified tester | Tracy |
| City of Watsonville | Owner hires a certified tester | Watsonville |
| Daly City Water | Owner hires a certified tester | Daly City |
| DSRSD | Owner hires a certified tester | San Ramon, Dublin |
| East Palo Alto | Owner hires a certified tester | East Palo Alto |
| EBMUD | Owner hires a certified tester | Oakland, San Leandro, Castro Valley, Walnut Creek, Danville, Alamo, San Ramon |
| Estero MID | Owner hires a certified tester | Foster City |
| Great Oaks Water | Owner hires a certified tester | San Jose |
| Livermore Municipal Water | Owner hires a certified tester | Livermore |
| Menlo Park Municipal Water | Owner hires a certified tester | Menlo Park |
| Mid-Peninsula Water District | Owner hires a certified tester | Belmont |
| North Coast County Water | Owner hires a certified tester | Pacifica |
| Palo Alto Utilities | Owner hires a certified tester | Palo Alto |
| Purissima Hills Water | The district tests devices itself | Los Altos Hills |
| San José Municipal Water | Owner hires a certified tester | San Jose |
| San Jose Water | The district tests devices itself | San Jose, Campbell, Los Gatos, Saratoga, Cupertino |
| San Mateo County | Owner hires a certified tester | San Mateo County |
| Santa Cruz Water | Owner hires a certified tester | Santa Cruz, Capitola |
| SFPUC | Owner hires a certified tester | San Francisco |
| Soquel Creek Water | Owner hires a certified tester | Capitola, Soquel |
| Town of Hillsborough | Owner hires a certified tester | Hillsborough |
Don’t see your city? Contact us or call (888) 505-1022 and we’ll tell you whether we cover your address.
Need a backflow test or repair?
Book online in two minutes, or call us. Upfront pricing, and we file the results with your water district.