PWSID
CA1510031
State
California
City
SAN JOSE
Population served
160,144
Primary source
SWP
Score history
▼ 30 points — the score moved from 100 to 70 on Jun 18, 2026, as newly published EPA data was incorporated.
2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.
PFAS & contaminant readings
Latest detections from EPA’s UCMR5 monitoring (through Jun 2025). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
7.6 ppt
limit 4 ppt
PFNA
Perfluorononanoic acid
4.7 ppt
limit 10 ppt
PFHxS
Perfluorohexanesulfonic acid
4.2 ppt
limit 10 ppt
Lithium
10,500 ppt
limit —
Violations & enforcement
4
Violations on record
0
Unaddressed
2
Health-based
9
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Mar 2018. Official EPA record →
Recent enforcement actions
- State action · SOX Mar 2018
- State action · SIA May 2011
- State action · SOX May 2011
- EPA/federal action · EOX Dec 2003
- State action · SIA Jun 2002
- State action · SOX Jan 1993
- State action · SFJ Jan 1993
- State action · SFJ Sep 1992
Area water-quality monitoring
Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.
Nitrate
1 station · latest Mar 2021
Arsenic
1 station · latest Mar 2021
Copper
1 station · latest Mar 2021
Fluoride
1 station · latest Mar 2021
Lead
1 station · latest Mar 2021
Uranium
1 station · latest Mar 2021
Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.
This profile is built from EPA public records for system CA1510031 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.