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Water system · PWSID SC1010009

SEABROOK ISLAND TOWN OF (1010009)

JOHNS ISLAND, SC · ~5,939 people served

Check your exact address → JOHNS ISLAND overview

Fair

PurityRadar safety score

PWSID

SC1010009

State

South Carolina

City

JOHNS ISLAND

Population served

5,939

Primary source

SWP

Score history

▼ 44 points — the score moved from 100 to 56 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 56

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

7.5 ppt

limit 4 ppt

Above EPA limit · 1.9×

PFOA

Perfluorooctanoic acid

5 ppt

limit 4 ppt

Above EPA limit · 1.3×

PFPeA

6.5 ppt

limit —

No federal limit

PFHxA

4.8 ppt

limit —

No federal limit

PFBS

3.4 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2025. Official EPA record →

Monitoring · Lead & Copper Rule began Jan 2024 Resolved

Monitoring & reporting · EPA contaminant 0999 began Jan 2024 Resolved

Monitoring & reporting · EPA contaminant 0200 began Jan 2024 Resolved

Other · EPA contaminant 7000 began Jul 2007 Resolved

Recent enforcement actions

State action · SIF Jan 2025
State action · SIF Jan 2025
State action · SIF Jan 2025
State action · SIE Mar 2024
State action · SIE Mar 2024
State action · SIA Mar 2024
State action · SIA Mar 2024
State action · SOX Mar 2024

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Manganese

1 station · latest Aug 2025

0.025 · max 0.047 mg/L · 11

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system SC1010009 — 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.