U

Unalaska, AK

—no score

Contamination score

Higher = more contaminated vs. other cities.

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

Unalaska Water System

PWSID:
AK2260309
Source:
Surface water
Serves:
9,400 people

EPA & DEP violations

Unalaska Water System

PWSID AK226030920 violations

  • TTHM — MR violation

    medium severityResolved

    TTHM MR violation (Resolved).

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

  • Total Haloacetic Acids (HAA5) — MR violation

    medium severityResolved

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

    EPA SDWIS · MR · Began Oct 1, 2025 · 10 months 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 ↗

  • Surface Water Treatment Rule — MR violation

    medium severityResolved

    Surface Water Treatment Rule MR violation (Resolved).

    EPA SDWIS · MR · Began May 1, 2024 · 2 years ago · Source ↗

  • Chlorine — MR violation

    medium severityResolved

    Chlorine MR violation (Resolved).

    EPA SDWIS · MR · Began May 1, 2024 · 2 years ago · Source ↗

  • Total Haloacetic Acids (HAA5) — MR violation

    medium severityResolved

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

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

  • Nitrate — MR violation

    medium severityResolved

    Nitrate MR violation (Resolved).

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

  • TTHM — MR violation

    medium severityResolved

    TTHM MR violation (Resolved).

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

  • CARBON, TOTAL — MR violation

    medium severityResolved

    CARBON, TOTAL MR violation (Resolved).

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

  • CARBON, TOTAL — MR violation

    medium severityResolved

    CARBON, TOTAL MR violation (Resolved).

    EPA SDWIS · MR · Began Jul 1, 2023 · 3 years ago · Source ↗

  • Surface Water Treatment Rule — MR violation

    medium severityResolved

    Surface Water Treatment Rule MR violation (Resolved).

    EPA SDWIS · MR · Began May 1, 2022 · 4 years ago · Source ↗

  • Revised Total Coliform Rule — MON violation

    medium severityResolved

    Revised Total Coliform Rule MON violation (Resolved).

    EPA SDWIS · MON · Began May 1, 2022 · 4 years ago · Source ↗

  • Chlorine — MR violation

    medium severityResolved

    Chlorine MR violation (Resolved).

    EPA SDWIS · MR · Began Apr 1, 2022 · 4 years ago · Source ↗

  • Revised Total Coliform Rule — MON violation

    medium severityResolved

    Revised Total Coliform Rule MON violation (Resolved).

    EPA SDWIS · MON · Began Nov 1, 2021 · 4 years ago · Source ↗

  • Revised Total Coliform Rule — MON violation

    medium severityResolved

    Revised Total Coliform Rule MON violation (Resolved).

    EPA SDWIS · MON · Began May 1, 2018 · 8 years ago · Source ↗

  • Surface Water Treatment Rule — MR violation

    medium severityResolved

    Surface Water Treatment Rule MR violation (Resolved).

    EPA SDWIS · MR · Began May 1, 2018 · 8 years ago · Source ↗

  • Chlorine — MR violation

    medium severityResolved

    Chlorine MR violation (Resolved).

    EPA SDWIS · MR · Began Apr 1, 2018 · 8 years ago · Source ↗

  • Combined Uranium — MR violation

    medium severityResolved

    Combined Uranium MR violation (Resolved).

    EPA SDWIS · MR · Began Jan 1, 2017 · 9 years ago · Source ↗

  • Gross Alpha, Excl. Radon and U — MR violation

    medium severityResolved

    Gross Alpha, Excl. Radon and U MR violation (Resolved).

    EPA SDWIS · MR · Began Jan 1, 2017 · 9 years ago · Source ↗

  • Gross Alpha, Excl. Radon and U — MR violation

    medium severityResolved

    Gross Alpha, Excl. Radon and U MR violation (Resolved).

    EPA SDWIS · MR · Began Jan 1, 2017 · 9 years ago · Source ↗

Water-related lawsuits

No lawsuits on record.

In the news & sources

No coverage linked yet.