San Jose, CA water quality
San Jose, CA is served by 29 public water systems, serving 1,411,611 people combined. Across those systems, we count 4 health-based violations in the last 5 years. The worst Tap Grade among them is C.
Water systems serving San Jose
SAN JOSE WATER
SAN JOSE, CA · 1,039,920 served
GREAT OAKS WC INC
SAN JOSE, CA · 110,088 served
CITY OF SAN JOSE - EVG/EDV/COY
SAN JOSE, CA · 101,265 served
CWSC LOS ALTOS SUBURBAN
SAN JOSE, CA · 69,973 served
CITY OF SAN JOSE - NSJ/ALVISO
SAN JOSE, CA · 45,559 served
CITY OF CUPERTINO
SAN JOSE, CA · 16,336 served
CWSC KING CITY
SAN JOSE, CA · 16,334 served
SANTA CLARA VALLEY MEDICAL CENTER
SAN JOSE, CA · 3,000 served
O'CONNOR HOSPITAL
SAN JOSE, CA · 2,500 served
WESTERN DIGITAL TECHNOLOGIES, INC.
SAN JOSE, CA · 2,439 served
MT. MADONNA COUNTY PARK
SAN JOSE, CA · 621 served
UVAS CANYON COUNTY PARK
SAN JOSE, CA · 509 served
CINNABAR HILLS GOLF CLUB
SAN JOSE, CA · 450 served
SANBORN-SKYLINE COUNTY PARK
SAN JOSE, CA · 414 served
JOSEPH GRANT COUNTY PARK
SAN JOSE, CA · 322 served
MT. PLEASANT WATER USERS ASSOCIATION
SAN JOSE, CA · 300 served
WALDEN WEST
SAN JOSE, CA · 273 served
COYOTE LAKE COUNTY PARK
SAN JOSE, CA · 216 served
METCALF MOTORCYCLE COUNTY PARK
SAN JOSE, CA · 210 served
CALERO COUNTY PARK
SAN JOSE, CA · 210 served
CHITACTAC-ADAMS COUNTY PARK
SAN JOSE, CA · 152 served
ROSEVIEW HEIGHTS MUTUAL WATER COMPANY
SAN JOSE, CA · 148 served
KENNON WATER COMPANY
SAN JOSE, CA · 142 served
FIELD SPORTS PARK/COYOTE RANCH
SAN JOSE, CA · 58 served
MURIEL WRIGHT RESIDENTIAL CENTER
SAN JOSE, CA · 52 served
HKN LLC
SAN JOSE, CA · 50 served
ABORN HEIGHTS WATER MUTUAL ASSOCIATION
SAN JOSE, CA · 45 served
SCC ANIMAL SHELTER/AIRPORT
SAN JOSE, CA · 25 served
SANTA CLARA VALLEY WATER DISTRICT
SAN JOSE, CA · 0 served
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Is San Jose, CA tap water safe to drink?
29 public water systems serve San Jose, CA, with 4 health-based violations in the last 5 years across them. The worst Tap Grade among them is C. A Tap Grade summarizes public EPA compliance records; it is not a determination that water is safe or unsafe to drink.
Does San Jose's water have lead in it?
The most recent 90th-percentile lead sample is 7.6 ppb, versus the EPA action level of 15 ppb.
Has PFAS been detected in San Jose's water?
Yes — at least one water system serving San Jose has detected PFAS under UCMR5.
Other cities in California
See all of California →Source: EPA SDWIS/ECHO · Data as of 2026Q2
TapGraded presents public EPA data for information only — it is not health advice and not a determination that any water is safe or unsafe to drink. For health concerns, contact your water utility or local health department.