PWSID
CA1910108
State
California
City
DOWNEY
Population served
11,437
Primary source
SWP
Score history
▼ 66 points — the score moved from 100 to 34 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 Nov 2024). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
21 ppt
limit 4 ppt
PFOA
Perfluorooctanoic acid
8.6 ppt
limit 4 ppt
PFHxS
Perfluorohexanesulfonic acid
3.9 ppt
limit 10 ppt
Lithium
31,000 ppt
limit —
PFHxA
6.5 ppt
limit —
PFPeA
6.4 ppt
limit —
PFBS
5.2 ppt
limit —
PFHpA
3.2 ppt
limit —
Violations & enforcement
1
Violations on record
0
Unaddressed
0
Health-based
2
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Dec 2019. Official EPA record →
Recent enforcement actions
- State action · SOX Dec 2019
- State action · SFJ Nov 2019
This profile is built from EPA public records for system CA1910108 — 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.