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
Get alerted when San Jose's water gets a violation
We'll only email you about this water system. Unsubscribe anytime.
Worried about what's in your tap?
See which water filters are certified to remove the contaminants found in your area.
Find a filter that matches your waterFrequently asked questions
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.
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