Water system · PWSID CA4010016
LOS OSOS COMMUNITY SERVICES DISTRICT
PWSID
CA4010016
State
California
City
LOS OSOS
Population served
7,086
Primary source
Groundwater
Score history
▼ 71 points — the score moved from 100 to 29 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).
PFOA
Perfluorooctanoic acid
15 ppt
limit 4 ppt
PFOS
Perfluorooctanesulfonic acid
12 ppt
limit 4 ppt
PFHxS
Perfluorohexanesulfonic acid
8.4 ppt
limit 10 ppt
Lithium
16,100 ppt
limit —
PFBS
18 ppt
limit —
PFPeA
17 ppt
limit —
PFHxA
17 ppt
limit —
PFBA
6 ppt
limit —
PFHpA
5.4 ppt
limit —
Violations & enforcement
2
Violations on record
0
Unaddressed
0
Health-based
3
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Dec 2019. Official EPA record →
Recent enforcement actions
- State action · SOX Dec 2019
- State action · SFL Dec 2019
- State action · SOX Apr 2000
This profile is built from EPA public records for system CA4010016 — 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.