WALNUT PARK

SPEARFISH, SD · ~180 people served

Check your exact address → SPEARFISH overview

100

Excellent

PurityRadar safety score

PWSID

SD4600316

State

South Dakota

City

SPEARFISH

Population served

180

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

122

Enforcement actions

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

Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Resolved

Reporting · EPA contaminant 5200 began Oct 2024 Resolved

Treatment technique · EPA contaminant 0400 health-based began Feb 2019 Resolved

Treatment technique · EPA contaminant 0700 health-based began Oct 2018 Resolved

Treatment technique · EPA contaminant 0400 health-based began May 2018 Resolved

Monitoring · Lead & Copper Rule began May 2018 Resolved

Monitoring & reporting · EPA contaminant 0999 began Apr 2018 Resolved

Treatment technique · EPA contaminant 0400 health-based began May 2017 Resolved

Treatment technique · EPA contaminant 0700 health-based began Aug 2016 Resolved

Treatment technique · EPA contaminant 0400 health-based began Feb 2016 Resolved

Monitoring & reporting · Total coliform began Sep 2013 Resolved

Monitoring & reporting · EPA contaminant 0999 began Jul 2013 Resolved

Recent enforcement actions

State action · SOX Feb 2025
State action · SOX Feb 2025
State action · SO6 Oct 2024
State action · SO6 Oct 2024
State action · SOX Aug 2019
State action · SOX Jul 2019
State action · SOX Jul 2019
State action · SIF Jun 2019

This profile is built from EPA public records for system SD4600316 — 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.