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Water system · PWSID SC4010001

COLUMBIA CITY OF (SC4010001)

COLUMBIA, SC · ~319,500 people served

Check your exact address → COLUMBIA overview
36
Action needed
PurityRadar safety score

PWSID

SC4010001

State

South Carolina

City

COLUMBIA

Population served

319,500

Primary source

Surface water

Score history

▼ 64 points — the score moved from 100 to 36 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 36

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

8.6 ppt

limit 4 ppt

Above EPA limit · 2.1×

PFOA

Perfluorooctanoic acid

6.9 ppt

limit 4 ppt

Above EPA limit · 1.7×

GenX (HFPO-DA)

GenX (HFPO-DA)

7.8 ppt

limit 10 ppt

Near EPA limit

PFPeA

6.8 ppt

limit —

No federal limit

PFHxA

5.7 ppt

limit —

No federal limit

PFBS

5.2 ppt

limit —

No federal limit

PFHpA

3 ppt

limit —

No federal limit

Violations & enforcement

18

Violations on record

0

Unaddressed

9

Health-based

57

Enforcement actions

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

Max contaminant level (MCL) · EPA contaminant 1009 health-based began Dec 2024 Resolved
Max contaminant level (MCL) · Lead & Copper Rule health-based began Apr 2021 Resolved
Monitoring & reporting · EPA contaminant 1009 began Aug 2017 Resolved
Treatment technique · EPA contaminant 0300 health-based began Nov 2015 Resolved
Treatment technique · EPA contaminant 0300 health-based began Oct 2009 Resolved
Treatment technique · EPA contaminant 0300 health-based began Apr 2009 Resolved
Treatment technique · EPA contaminant 0300 health-based began May 2007 Resolved
Treatment technique · EPA contaminant 0300 health-based began Aug 2005 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 1997 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 1997 Resolved
Monitoring & reporting · Nitrate began Jul 1993 Resolved
Monitoring & reporting · Nitrate began Apr 1993 Resolved

Recent enforcement actions

  • State action · SIF Feb 2025
  • State action · SIA Feb 2025
  • State action · SIE Feb 2025
  • State action · SOX Dec 2024
  • State action · SFM Jun 2021
  • State action · SFO Jun 2021
  • State action · SOX May 2021
  • State action · SFN Apr 2021

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

13 stations · latest Mar 2026

0.049 · max 2 mg/L · 144

Lead

8 stations · latest Sep 2025

0.003 · max 0.017 mg/L · 61

Copper

2 stations · latest Sep 2025

0.013 · max 0.015 mg/L · 2

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 SC4010001 — 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.