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Water system · PWSID SD4600007

BIG STONE CITY

BIG STONE CITY, SD · ~412 people served

Check your exact address → BIG STONE CITY overview
100
Excellent
PurityRadar safety score

PWSID

SD4600007

State

South Dakota

City

BIG STONE CITY

Population served

412

Primary source

GWP

Score history

No change since tracking began Jun 18, 2026.

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

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

40

Violations on record

0

Unaddressed

0

Health-based

25

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2022. Official EPA record →

Monitoring · Lead & Copper Rule began Nov 2021 Resolved
Monitoring & reporting · EPA contaminant 0999 began Oct 2021 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 2018 Resolved
Monitoring & reporting · Total coliform began Oct 2014 Resolved
Other · EPA contaminant 7500 began Jul 2008 Resolved
Other · EPA contaminant 7000 began Jul 2007 Resolved
Monitoring & reporting · Total coliform began Jun 2007 Resolved
Monitoring & reporting · Nitrate began Jan 1995 Resolved
Monitoring & reporting · EPA contaminant 2306 began Jan 1993 Resolved
Monitoring & reporting · EPA contaminant 2050 began Jan 1993 Resolved
Monitoring & reporting · EPA contaminant 2067 began Jan 1993 Resolved
Monitoring & reporting · EPA contaminant 2065 began Jan 1993 Resolved

Recent enforcement actions

  • State action · SOX Sep 2022
  • State action · SOX Jan 2022
  • State action · SIF Dec 2021
  • State action · SIF Dec 2021
  • State action · SIE Dec 2021
  • State action · SIE Dec 2021
  • State action · SIF Apr 2019
  • State action · SOX Dec 2018

This profile is built from EPA public records for system SD4600007 — 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.