BIG BEND WATER SYSTEM

FORT THOMPSON, SD · ~80 people served

Check your exact address → FORT THOMPSON overview

100

Excellent

PurityRadar safety score

PWSID

084690438

State

South Dakota

City

FORT THOMPSON

Population served

Primary source

Groundwater

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

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Monitoring · Lead & Copper Rule began Jun 2021 Resolved

Monitoring & reporting · Fluoride began Jan 2020 Resolved

Monitoring & reporting · Total coliform began Apr 2012 Resolved

Other · EPA contaminant 7000 began Jul 2011 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 2010 Resolved

Monitoring & reporting · Total coliform began Dec 2008 Resolved

Other · EPA contaminant 7000 began Jul 2006 Resolved

Monitoring & reporting · Nitrite began Jan 2006 Resolved

Monitoring & reporting · Nitrate began Jan 2006 Resolved

Monitoring & reporting · Thallium began Jan 2006 Resolved

Monitoring & reporting · EPA contaminant 2032 began Jan 2005 Resolved

Monitoring & reporting · EPA contaminant 2031 began Jan 2005 Resolved

Recent enforcement actions

State action · SOX Jun 2023
State action · SOX Jul 2021
State action · SIA Jun 2012
State action · SIE Jun 2012
State action · SOX May 2012
State action · SOX Sep 2011
State action · SII Aug 2011
State action · SOX May 2011

This profile is built from EPA public records for system 084690438 — 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.