Home/ Directory/ SD/ WILLOW LAKE

Water system · PWSID SD4600370

WILLOW LAKE

WILLOW LAKE, SD · ~255 people served

Check your exact address → WILLOW LAKE overview
100
Excellent
PurityRadar safety score

PWSID

SD4600370

State

South Dakota

City

WILLOW LAKE

Population served

255

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

12

Violations on record

0

Unaddressed

12

Health-based

49

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Feb 2023. Official EPA record →

Treatment technique · EPA contaminant 0400 health-based began Nov 2020 Resolved
Treatment technique · EPA contaminant 0400 health-based began Feb 2015 Resolved
Treatment technique · EPA contaminant 0400 health-based began Feb 2011 Resolved
Treatment technique · EPA contaminant 0400 health-based began Feb 2006 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2001 Resolved
Max contaminant level (MCL) · Total coliform health-based began Dec 1999 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 1997 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 1994 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 1993 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 1992 Resolved
Max contaminant level (MCL) · Total coliform health-based began Dec 1991 Resolved
Max contaminant level (MCL) · Total coliform health-based began Oct 1991 Resolved

Recent enforcement actions

  • State action · SOX Feb 2023
  • State action · SIA Nov 2020
  • State action · SOX Apr 2016
  • State action · SIA Mar 2014
  • State action · SOX Mar 2011
  • State action · SIA Feb 2011
  • State action · SOX Aug 2007
  • State action · SIA Feb 2006

This profile is built from EPA public records for system SD4600370 — 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.