PWSID
CA3010064
State
California
City
WESTMINSTER
Population served
90,911
Primary source
SWP
Score history
▼ 16 points — the score moved from 100 to 84 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 Sep 2024). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
5.3 ppt
limit 4 ppt
PFHxS
Perfluorohexanesulfonic acid
5 ppt
limit 10 ppt
Lithium
9,210 ppt
limit —
Violations & enforcement
3
Violations on record
0
Unaddressed
2
Health-based
11
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Mar 2013. Official EPA record →
Recent enforcement actions
- State action · SIA Mar 2013
- State action · SOX Feb 2013
- EPA/federal action · EOX Mar 2000
- EPA/federal action · EOX Dec 1993
- EPA/federal action · EO+ Nov 1993
- State action · SFJ Jun 1993
- State action · SOX Jun 1993
- State action · SOX Apr 1993
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.
Arsenic
2 stations · latest Jul 2020
Copper
2 stations · latest Jul 2020
Fluoride
2 stations · latest Jul 2020
Lead
2 stations · latest Jul 2020
Nitrate
1 station · latest Jul 2020
Uranium
2 stations · latest Jul 2020
Manganese
1 station · latest Jul 2020
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 CA3010064 — 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.