Who supplies my water · CA
Where Portola Valley's tap water comes from
EPA records point to California Water Service as the water system for Portola Valley.
San Mateo County · Population 4,282
The water system for Portola Valley
California Water Service
PWSID CA4110006 · Purity Score 95/100 (Excellent) · Confidence: moderate · Assessed at the water-system levelAbout 99% of Portola Valley's homes are inside California Water Service's service area (EPA service-area map).
System-level records from EPA. Not a test of your tap.
ZIP codes in Portola Valley
A ZIP code is a postal area, not a water service area. Your water bill names your supplier.
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Follow Portola Valley's water
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