100
Excellent
City-wide average score
1
Systems serving this city
0
With PFAS detected (UCMR5)
0
Above an EPA PFAS limit
0
Unresolved health violations
Across all community water systems EPA records map to Jose. PFAS figures are from EPA UCMR5 (2023–25) monitoring; not every system was sampled.
Community water systems serving Jose
SANTA CLARA VALLEY WATER DISTRICTCA4310027 100› SAN JOSE WATER~1,039,920 people served 78› CWS - BAKERSFIELD~267,881 people served 59› CALIFORNIA WATER SERVICE - STOCKTON~176,266 people served 88› BAKERSFIELD, CITY OF~160,144 people served 70› CALIFORNIA WATER SERVICE CO. - ELA~152,474 people served 67› CWS - VISALIA~148,496 people served 82› CALIFORNIA WATER SERVICE CO. - DOMINGUEZ~143,996 people served 100› CWSC SALINAS~123,679 people served 100› CAL-WATER SERVICE CO.-CHICO~114,925 people served 45› GREAT OAKS WC INC~110,088 people served 83› CALIFORNIA WATER SERVICE - SAN MATEO~102,348 people served 100› CITY OF SAN JOSE - EVG/EDV/COY~101,265 people served 100› CALIFORNIA WATER SERVICE CO. - HERM/REDO~96,853 people served 100› CALIFORNIA WATER SERVICE CO. - PALOS VER~71,452 people served 100› CWSC LOS ALTOS SUBURBAN~69,973 people served 100› CALIFORNIA WATER SERVICE-S SAN FRANCISCO~64,146 people served 100› CALIFORNIA WATER SERVICE - BEAR GULCH~61,431 people served 100› CALIFORNIA WATER SERVICE - LIVERMORE~60,414 people served 46› CITY OF SAN JOSE - NSJ/ALVISO~45,559 people served 100› HAWTHORNE-CITY WATER DEPT.~44,718 people served 100› CALIFORNIA WATER SERVICE - SAN CARLOS~35,344 people served 100› CWS - SELMA~26,517 people served 100› CWS - NORTH GARDEN~22,762 people served 88› CALIFORNIA WATER SERVICE CO - WESTLAKE~19,533 people served 100› CALIFORNIA WATER SERVICE CO.-TRAVIS AFB~18,111 people served 100› CITY OF CUPERTINO~16,336 people served 100› CWSC KING CITY~16,334 people served 100› CAL-WATER SERVICE CO.-MARYSVILLE~12,419 people served 100› CAL-WATER SERVICE CO.-OROVILLE~11,106 people served 100› CALIFORNIA WATER SERVICE CO. - DIXON~10,623 people served 100› CAL-WATER SERVICE CO.-WILLOWS~7,240 people served 100› CWSC SALINAS HILLS~5,293 people served 100› COMMERCE-CITY, WATER DEPT.~4,205 people served 67› TESORO VIEJO MASTER MWC, INC.~3,885 people served 100› CWSC OAK HILLS~3,161 people served 100› CWS - KERNVILLE~2,572 people served 100› LUCERNE WATER CO. - CAL WATER SERVICE~2,129 people served 100› CWSC LAS LOMAS~2,084 people served 100› CAL-WATER SERVICE CO.-HAMILTON CITY~1,799 people served 100› CALIFORNIA WATER SERVICE CO.-LANCASTER~1,387 people served 100› CWS SOUTHLAKE SYSTEM~1,112 people served 100› WESTFIELD GARDEN MOBILE HOME PARK~942 people served 100› CALIFORNIA WATER SERVICE CO-LAKE HUGHES~929 people served 100› CALIFORNIA WATER SERVICE CO-LEONA VALLEY~878 people served 100› CWS - LOWER BODFISH WATER SYSTEM~736 people served 100› CWS - TULCO WATER COMPANY~716 people served 100› CEDAR GROVE MOBILE HOME PARK~595 people served 100› MISSION OAKS MOBILE HOME PARK~550 people served 100› RIVERBEND MHP~500 people served 100› ARMSTRONG VALLEY-CAL WATER SERVICE (PUC)~473 people served 100› COAST SPRINGS - CAL. WATER SERVICE (PUC)~388 people served 100› CWS - UPPER BODFISH WATER SYSTEM~307 people served 100› MT. PLEASANT WATER USERS ASSOCIATION~300 people served 100› CWS - LAKELAND~294 people served 100› CWS-ONYX WATER SYSTEM~284 people served 100› CWS-SPLIT MOUNTAIN WATER SYSTEM~226 people served 100› LONGHORN MOBILE HOME COMMUNITY~220 people served 100› CWS - FREMONT VALLEY~167 people served 100› BELLA LAGO MOBILE HOME PARK~152 people served 85›
Jose water FAQ
How is Jose's water quality scored?
PurityRadar computes a 0–100 score from public EPA records for the community water systems serving Jose. The city-wide figure shown is the average of those systems.
Where does the data come from?
EPA SDWIS — the federal Safe Drinking Water Information System — covering active community water systems and their health-based violations. Every figure traces back to that public record.
Is this a substitute for testing my tap?
No. System-level data can't account for your home's own plumbing (lead service lines, fixtures). For health decisions, test your tap with a certified lab and confirm with your utility.