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Water system · PWSID ND5301079

NORTHWEST RURAL WATER DISTRICT

WILLISTON, ND · ~5,102 people served

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

PWSID

ND5301079

State

North Dakota

City

WILLISTON

Population served

5,102

Primary source

SWP

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

Lithium

56,600 ppt

limit —

No federal limit

PFBA

6.3 ppt

limit —

No federal limit

Violations & enforcement

3

Violations on record

0

Unaddressed

0

Health-based

13

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2024. Official EPA record →

Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2023 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2023 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 1993 Resolved

Recent enforcement actions

  • State action · SOX Aug 2024
  • State action · SIF Nov 2023
  • State action · SIE Sep 2023
  • State action · SIA Sep 2023
  • State action · SOX Jun 1994
  • State action · SIF Apr 1994
  • State action · SIA Apr 1994
  • State action · SIE Apr 1994

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Manganese

5 stations · latest May 2025

0.0675 · max 2.33 mg/L · 131

Fluoride

5 stations · latest May 2025

0.08 · max 0.566 mg/L · 122

Copper

3 stations · latest May 2025

7.13 · max 20.4 ug/L · 34

Arsenic

3 stations · latest May 2025

6.39 · max 28.5 ug/L · 31

Lead

2 stations · latest May 2025

5.7 · max 6.4 ug/L · 2

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system ND5301079 — 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.