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Water system · PWSID SC1010001

CHARLESTON WATER SYSTEM (SC1010001)

CHARLESTON, SC · ~327,422 people served

Check your exact address → CHARLESTON overview

Fair

PurityRadar safety score

PWSID

SC1010001

State

South Carolina

City

CHARLESTON

Population served

327,422

Primary source

Surface water

Score history

▼ 32 points — the score moved from 100 to 68 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 68

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 2025). Levels in parts per trillion (ppt).

PFOS

Perfluorooctanesulfonic acid

6.5 ppt

limit 4 ppt

Above EPA limit · 1.6×

PFOA

Perfluorooctanoic acid

4.1 ppt

limit 4 ppt

Above EPA limit · 1.0×

PFPeA

4.4 ppt

limit —

No federal limit

PFHxA

3.9 ppt

limit —

No federal limit

PFBS

3.8 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2003. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2002 Resolved

Monitoring & reporting · Nitrate began Jul 1993 Resolved

Monitoring & reporting · Nitrate began Apr 1993 Resolved

Monitoring & reporting · Cadmium began Jan 1993 Resolved

Monitoring & reporting · Chromium (total) began Jan 1993 Resolved

Monitoring & reporting · Antimony began Jan 1993 Resolved

Monitoring & reporting · Barium began Jan 1993 Resolved

Monitoring & reporting · Selenium began Jan 1993 Resolved

Monitoring & reporting · Nitrate began Jan 1993 Resolved

Recent enforcement actions

State action · SOX Sep 2003
State action · SIA Jan 2003
State action · SOX Oct 1994
State action · SO8 Jan 1994
State action · SO8 Oct 1993
State action · SOX Jul 1993
State action · SOX Apr 1993
EPA/federal action · EFJ Sep 1982

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

3 stations · latest Mar 2026

0.061 · max 0.096 mg/L · 6

Lead

1 station · latest May 2020

0.0039 · max 0.0039 mg/L · 1

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 SC1010001 — 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.