Water system · PWSID CA4010001
CITY OF ARROYO GRANDE UTILITIES DIVISION
PWSID
CA4010001
State
California
City
ARROYO GRANDE
Population served
17,963
Primary source
SWP
Score history
▼ 30 points — the score moved from 100 to 70 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
5.6 ppt
limit 4 ppt
PFOA
Perfluorooctanoic acid
4.6 ppt
limit 4 ppt
PFHxS
Perfluorohexanesulfonic acid
4.3 ppt
limit 10 ppt
Lithium
14,000 ppt
limit —
PFBS
11 ppt
limit —
PFHxA
3.3 ppt
limit —
PFPeA
3.3 ppt
limit —
Violations & enforcement
2
Violations on record
0
Unaddressed
1
Health-based
6
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Mar 2013. Official EPA record →
Recent enforcement actions
- State action · SOX Mar 2013
- State action · SFL Mar 2013
- EPA/federal action · EOX Mar 2000
- State action · SOX Apr 1997
- State action · SFJ Nov 1996
- EPA/federal action · EOX Dec 1993
This profile is built from EPA public records for system CA4010001 — 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.