Home/ Directory/ SD/ TRI-COUNTY RURAL WATER SYSTEM

Water system · PWSID SD4600112

TRI-COUNTY RURAL WATER SYSTEM

EAGLE BUTTE, SD · ~2,190 people served

Check your exact address → EAGLE BUTTE overview
100
Excellent
PurityRadar safety score

PWSID

SD4600112

State

South Dakota

City

EAGLE BUTTE

Population served

2,190

Primary source

Surface water

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

Latest detections from EPA’s UCMR5 monitoring (through Jul 2025). Levels in parts per trillion (ppt).

Lithium

48,300 ppt

limit —

No federal limit

Violations & enforcement

61

Violations on record

0

Unaddressed

15

Health-based

153

Enforcement actions

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

Monitoring · Lead & Copper Rule began Dec 2022 Resolved
Monitoring & reporting · EPA contaminant 0999 began Oct 2022 Resolved
Other began May 2013 Resolved
Treatment technique · EPA contaminant 0300 health-based began Mar 2009 Resolved
Treatment technique · EPA contaminant 0300 health-based began Dec 2008 Resolved
Treatment technique · EPA contaminant 0300 health-based began Nov 2006 Resolved
Other · EPA contaminant 7500 began Apr 2006 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2006 Resolved
Other · EPA contaminant 7500 began Jan 2006 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2006 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2005 Resolved
Other · EPA contaminant 7000 began Oct 2005 Resolved

Recent enforcement actions

  • State action · SOX May 2023
  • State action · SIF Jan 2023
  • State action · SIE Jan 2023
  • State action · SIE Jan 2023
  • State action · SOX Jan 2023
  • State action · SOX Apr 2014
  • State action · SO6 Jan 2014
  • State action · SOX May 2010

This profile is built from EPA public records for system SD4600112 — 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.