San Mateo County Backflow Testing Information

The following water purveyors are a part of the San Mateo County Cross Connection Control Program as illustrated in this map:

• Mid-Peninsula Water District (City of Belmont)

• Brisbane Water Department/Guadalupe Valley Municipal Improvement District

• Burlingame Water Department

• County Service Area 7 (La Honda)

• County Service Area 11 (Pescadero)

• Cuesta La Honda Guild

• Daly City Water Department

• Estero Municipal Improvement District (City of Foster City)

• Hillsborough Water Department

• Menlo Park Municipal Water District

• Millbrae Water Department

• North Coast County Water District (City of Pacifica)

• O’Connor Tract Co-op Water Company (East Palo Alto)

• Palo Alto Park Mutual (East Palo Alto)

• American Water (East Palo Alto)

• San Bruno Water Department

• Westborough Water District (in South San Francisco) 

https://www.smchealth.org/crossconnection