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Water system · PWSID SC1820001

DCWA KNIGHTSVILLE (SC1820001)

SUMMERVILLE, SC · ~40,141 people served

Check your exact address → SUMMERVILLE overview
43
Action needed
PurityRadar safety score

PWSID

SC1820001

State

South Carolina

City

SUMMERVILLE

Population served

40,141

Primary source

SWP

Score history

▼ 57 points — the score moved from 100 to 43 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 43

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

8.1 ppt

limit 4 ppt

Above EPA limit · 2.0×

PFOA

Perfluorooctanoic acid

6.5 ppt

limit 4 ppt

Above EPA limit · 1.6×

Lithium

11,600 ppt

limit —

No federal limit

PFPeA

7 ppt

limit —

No federal limit

PFHxA

6.1 ppt

limit —

No federal limit

PFBA

5 ppt

limit —

No federal limit

PFBS

4.6 ppt

limit —

No federal limit

PFHpA

3 ppt

limit —

No federal limit

Violations & enforcement

4

Violations on record

0

Unaddressed

3

Health-based

15

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2010. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began May 2010 Resolved
Monitoring & reporting · EPA contaminant 3014 began May 2010 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2005 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2005 Resolved

Recent enforcement actions

  • State action · SIF Jul 2010
  • State action · SIE Jul 2010
  • State action · SIA Jul 2010
  • State action · SOX Jul 2010
  • State action · SIA Jul 2010
  • State action · SIE Jul 2010
  • State action · SOX Jul 2010
  • State action · SOX May 2010

This profile is built from EPA public records for system SC1820001 — 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.