WATERTOWN MUNICIPAL UTILITIES

WATERTOWN, SD · ~23,230 people served

Check your exact address → WATERTOWN overview

100

Excellent

PurityRadar safety score

PWSID

SD4600356

State

South Dakota

City

WATERTOWN

Population served

23,230

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

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

Lithium

12,400 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Nov 2016. Official EPA record →

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2016 Resolved

Monitoring & reporting · EPA contaminant 2050 began Jan 1999 Resolved

Recent enforcement actions

State action · SOX Nov 2016
State action · SIF Nov 2016
State action · SIE Oct 2016
State action · SOX Sep 2000
State action · SIF May 2000
State action · SIE Apr 2000
State action · SIA Sep 1987
State action · SIA Sep 1986

This profile is built from EPA public records for system SD4600356 — 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.