Water system · PWSID SC1020002
ST JOHN'S WATER (SC1020002)
PWSID
SC1020002
State
South Carolina
City
JOHNS ISLAND
Population served
22,592
Primary source
SWP
Score history
▼ 45 points — the score moved from 100 to 55 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 Oct 2025). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
7.2 ppt
limit 4 ppt
PFOA
Perfluorooctanoic acid
5.4 ppt
limit 4 ppt
PFPeA
5.6 ppt
limit —
PFHxA
4.9 ppt
limit —
PFBS
4.5 ppt
limit —
Violations & enforcement
3
Violations on record
0
Unaddressed
0
Health-based
16
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Jul 2016. Official EPA record →
Recent enforcement actions
- State action · SIF Jul 2016
- State action · SOX Dec 2015
- State action · SIE Nov 2015
- State action · SIE Nov 2015
- State action · SIA Nov 2015
- State action · SIA Nov 2015
- State action · SOX Jul 1994
- EPA/federal action · EOX Dec 1993
This profile is built from EPA public records for system SC1020002 — 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.