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Water system · PWSID ND5301012

WILLISTON CITY OF

WILLISTON, ND · ~26,426 people served

Check your exact address → WILLISTON overview
100
Excellent
PurityRadar safety score

PWSID

ND5301012

State

North Dakota

City

WILLISTON

Population served

26,426

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 Oct 2023). Levels in parts per trillion (ppt).

Lithium

68,500 ppt

limit —

No federal limit

Violations & enforcement

8

Violations on record

0

Unaddressed

6

Health-based

31

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2015. Official EPA record →

Monitoring & reporting · Total coliform began Nov 2014 Resolved
Monitoring & reporting · EPA contaminant 1006 began Oct 2014 Resolved
Treatment technique · EPA contaminant 0800 health-based began Jun 2014 Resolved
Treatment technique · EPA contaminant 0800 health-based began Feb 2011 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
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2005 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 1994 Resolved

Recent enforcement actions

  • State action · SIF Aug 2015
  • State action · SIF Aug 2015
  • State action · SOX May 2015
  • State action · SIA Jan 2015
  • State action · SIE Jan 2015
  • State action · SIE Dec 2014
  • State action · SIA Dec 2014
  • State action · SOX Oct 2014

This profile is built from EPA public records for system ND5301012 — 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.