S

Sidney, MT

—no score

Contamination score

Higher = more contaminated vs. other cities.

⚠️11 health-based violations on record.
0
Water sources
20
Violations
0
Pollution sources
0
Self-reported
0
Lawsuits

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Reported illness & cancer claims

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Self-reported issues

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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

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Public water systems

Sidney City Of

PWSID:
MT0000330
Source:
Ground water
Serves:
5,000 people

Dry Redwater Regional Water Authority

PWSID:
MT0004839
Source:
Ground water
Serves:
365 people

Richland Co Valley View Wua

PWSID:
MT0000514
Source:
Ground water
Serves:
85 people

Mount Pleasant Estates

PWSID:
MT0000644
Source:
Ground water
Serves:
45 people

EPA & DEP violations

City-wide

20 violations

  • TTHM — MCL violation

    high severityHealth-basedUnaddressed

    TTHM MCL violation (Unaddressed).

    EPA SDWIS · MCL · Began Apr 1, 2026 · 4 months ago · Source ↗

  • TTHM — MCL violation

    high severityHealth-basedArchived

    TTHM MCL violation (Archived).

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

  • TTHM — MCL violation

    high severityHealth-basedArchived

    TTHM MCL violation (Archived).

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

  • TTHM — MCL violation

    high severityHealth-basedArchived

    TTHM MCL violation (Archived).

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

  • TTHM — MCL violation

    high severityHealth-basedArchived

    TTHM MCL violation (Archived).

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

  • TTHM — MCL violation

    high severityHealth-basedArchived

    TTHM MCL violation (Archived).

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

  • Lead and Copper Rule — MR violation

    medium severityResolved

    Lead and Copper Rule MR violation (Resolved).

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

  • TTHM — MCL violation

    high severityHealth-basedArchived

    TTHM MCL violation (Archived).

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

  • Lead and Copper Rule — MR violation

    medium severityResolved

    Lead and Copper Rule MR violation (Resolved).

    EPA SDWIS · MR · 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 severityResolved

    Consumer Confidence Rule Other violation (Resolved).

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

  • TTHM — MCL violation

    high severityHealth-basedArchived

    TTHM 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 May 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 Apr 1, 2024 · 2 years ago · Source ↗

  • TTHM — MCL violation

    high severityHealth-basedArchived

    TTHM MCL violation (Archived).

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

  • TTHM — MCL violation

    high severityHealth-basedArchived

    TTHM MCL violation (Archived).

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

  • TTHM — MCL violation

    high severityHealth-basedArchived

    TTHM MCL violation (Archived).

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

  • Lead and Copper Rule — MR violation

    medium severityResolved

    Lead and Copper Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Oct 1, 2021 · 4 years ago · Source ↗

Water-related lawsuits

No lawsuits on record.

In the news & sources

No coverage linked yet.