PWSID
CA1910212
State
California
City
SAN DIMAS
Population served
27,072
Primary source
Groundwater
Score history
▼ 50 points — the score moved from 100 to 50 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 Jul 2024). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
16 ppt
limit 4 ppt
PFOA
Perfluorooctanoic acid
5.2 ppt
limit 4 ppt
PFHxS
Perfluorohexanesulfonic acid
6.2 ppt
limit 10 ppt
Violations & enforcement
1
Violations on record
0
Unaddressed
0
Health-based
3
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Aug 2002. Official EPA record →
Recent enforcement actions
- State action · SFJ Aug 2002
- State action · SOX Nov 2000
- State action · SFL Nov 2000
This profile is built from EPA public records for system CA1910212 — 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.