L

Lewistown, MT

—no score

Contamination score

Higher = more contaminated vs. other cities.

⚠️10 health-based violations on record.
0
Water sources
20
Violations
0
Pollution sources
0
Self-reported
0
Lawsuits

Share this with friends & family you care about ❤️

Help someone you love know what's in their water — we'll email them Lewistown's report. No sign-ups, no list.

Reported illness & cancer claims

No claims reported yet. Be the first to add one.

Claims are aggregated from public records and community reports and may be unverified. If you believe your illness is linked to local water, request a consultation.

Self-reported issues

No issues reported yet. Be the first to report one.

Pollution sources & reported claims near your water

Factories, greenhouses, and contaminated sites mapped around the water supply. Tap any circle for detail.

Critical High Medium Reported claim

Get water alerts for Lewistown, MT

We'll email you when a new violation, lawsuit, or health report appears for Lewistown's water. Free, unsubscribe anytime.

Home water filtration system

Protect your home

Improve Lewistown's water

A certified filtration system can remove lead, PFAS, nitrates, and the contaminants flagged on this page. Get a free, no-obligation quote tailored to your home.

What are you interested in?

By submitting you agree to be contacted about water treatment options.

Public water systems

Spring Creek Colony Lewistown

PWSID:
MT0000433
Source:
Ground water
Serves:
48 people

Deerfield Hutterite Colony

PWSID:
MT0000431
Source:
Ground water
Serves:
51 people

King Ranch Colony

PWSID:
MT0000432
Source:
Ground water
Serves:
56 people

Mountain Acres Mb Hm Pk

PWSID:
MT0003809
Source:
Ground water
Serves:
320 people

Lewistown City Of

PWSID:
MT0000271
Source:
Ground water
Serves:
5,923 people

EPA & DEP violations

City-wide

20 violations

  • Revised Total Coliform Rule — MON violation

    medium severityResolved

    Revised Total Coliform Rule MON violation (Resolved).

    EPA SDWIS · MON · Began Feb 1, 2026 · 6 months ago · Source ↗

  • Nitrate-Nitrite — MCL violation

    high severityHealth-basedArchived

    Nitrate-Nitrite MCL violation (Archived).

    EPA SDWIS · MCL · Began Jan 1, 2026 · 7 months ago · Source ↗

  • Nitrate-Nitrite — MCL violation

    high severityHealth-basedArchived

    Nitrate-Nitrite MCL violation (Archived).

    EPA SDWIS · MCL · Began Oct 1, 2025 · 10 months ago · Source ↗

  • Consumer Confidence Rule — Other violation

    medium severityResolved

    Consumer Confidence Rule Other violation (Resolved).

    EPA SDWIS · Other · Began Jul 1, 2025 · 1 year ago · Source ↗

  • Consumer Confidence Rule — Other violation

    medium severityResolved

    Consumer Confidence Rule Other violation (Resolved).

    EPA SDWIS · Other · Began Jul 1, 2025 · 1 year ago · Source ↗

  • Nitrate-Nitrite — MCL violation

    high severityHealth-basedArchived

    Nitrate-Nitrite MCL violation (Archived).

    EPA SDWIS · MCL · Began Jul 1, 2025 · 1 year ago · Source ↗

  • Nitrate-Nitrite — MCL violation

    high severityHealth-basedArchived

    Nitrate-Nitrite MCL violation (Archived).

    EPA SDWIS · MCL · Began Apr 1, 2025 · 1 year ago · Source ↗

  • TTHM — MR violation

    medium severityArchived

    TTHM MR violation (Archived).

    EPA SDWIS · MR · Began Jan 1, 2025 · 1 year ago · Source ↗

  • Total Haloacetic Acids (HAA5) — MR violation

    medium severityArchived

    Total Haloacetic Acids (HAA5) MR violation (Archived).

    EPA SDWIS · MR · Began Jan 1, 2025 · 1 year ago · Source ↗

  • Nitrate-Nitrite — MCL violation

    high severityHealth-basedArchived

    Nitrate-Nitrite MCL violation (Archived).

    EPA SDWIS · MCL · Began Jan 1, 2025 · 1 year ago · Source ↗

  • Lead and Copper Rule — MR violation

    medium severityUnaddressed

    Lead and Copper Rule MR violation (Unaddressed).

    EPA SDWIS · MR · Began Dec 30, 2024 · 1 year ago · Source ↗

  • Nitrate-Nitrite — MCL violation

    high severityHealth-basedArchived

    Nitrate-Nitrite MCL violation (Archived).

    EPA SDWIS · MCL · Began Oct 1, 2024 · 1 year ago · Source ↗

  • Revised Total Coliform Rule — MON violation

    medium severityResolved

    Revised Total Coliform Rule MON violation (Resolved).

    EPA SDWIS · MON · Began Sep 1, 2024 · 1 year ago · Source ↗

  • Consumer Confidence Rule — Other violation

    medium severityUnaddressed

    Consumer Confidence Rule Other violation (Unaddressed).

    EPA SDWIS · Other · Began Jul 1, 2024 · 2 years ago · Source ↗

  • Nitrate-Nitrite — MCL violation

    high severityHealth-basedArchived

    Nitrate-Nitrite MCL violation (Archived).

    EPA SDWIS · MCL · Began Jul 1, 2024 · 2 years ago · Source ↗

  • Revised Total Coliform Rule — MON violation

    medium severityResolved

    Revised Total Coliform Rule MON violation (Resolved).

    EPA SDWIS · MON · Began Jun 1, 2024 · 2 years ago · Source ↗

  • Nitrate-Nitrite — MCL violation

    high severityHealth-basedArchived

    Nitrate-Nitrite MCL violation (Archived).

    EPA SDWIS · MCL · Began Apr 1, 2024 · 2 years ago · Source ↗

  • Nitrate-Nitrite — MCL violation

    high severityHealth-basedArchived

    Nitrate-Nitrite MCL violation (Archived).

    EPA SDWIS · MCL · Began Jan 1, 2024 · 2 years ago · Source ↗

  • Nitrate-Nitrite — MR violation

    medium severityResolved

    Nitrate-Nitrite MR violation (Resolved).

    EPA SDWIS · MR · Began Oct 1, 2023 · 2 years ago · Source ↗

  • Nitrate-Nitrite — MCL violation

    high severityHealth-basedArchived

    Nitrate-Nitrite MCL violation (Archived).

    EPA SDWIS · MCL · Began Oct 1, 2023 · 2 years ago · Source ↗

Water-related lawsuits

No lawsuits on record.

In the news & sources

No coverage linked yet.