PWSID
CA3610029
State
California
City
MONTCLAIR
Population served
56,017
Primary source
SWP
Score history
▼ 19 points — the score moved from 100 to 81 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 2025). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
5.6 ppt
limit 4 ppt
PFHxS
Perfluorohexanesulfonic acid
5.4 ppt
limit 10 ppt
PFBA
9.3 ppt
limit —
PFPeA
3.5 ppt
limit —
PFHxA
3.3 ppt
limit —
Violations & enforcement
1
Violations on record
0
Unaddressed
0
Health-based
27
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Jun 2013. Official EPA record →
Recent enforcement actions
- State action · SOX Jun 2013
- State action · SFJ Jun 2013
- State action · SID Sep 1988
- State action · SIF Sep 1988
- State action · SIE Sep 1988
- State action · SIC Sep 1988
- State action · SFK Sep 1988
- State action · SFL Sep 1988
This profile is built from EPA public records for system CA3610029 — 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.