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F0/100

UNALASKA WATER SYSTEM — Water Quality Report 2026

Serving 9,400 people · Alaska

Water Source

Surface Water

County

—

System ID

AK2260309

Violations

291

Contaminant Test Results

2 contaminants above EPA health goals

Contaminant	Detected	Limit (MCL)	Goal (MCLG)	Status
Copper (90th percentile)	1.38 mg/L	1.30 mg/L	1.30 mg/L	Over Limit
Lead (90th percentile)	0.003 mg/L	0.015 mg/L	0 mg/L	Above Goal

EPA Violation History

12

Violations (last 5yr)

0

Unresolved

0

Health-Related

TIER 3Resolved

Violation related to Coliform (pre-2016 TCR)

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: May 1, 2024 – May 31, 2024Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway

TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: May 1, 2024 – May 31, 2024Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway

TIER 3Resolved

Monitoring Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: May 1, 2024 – May 31, 2024Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway

TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2024 – December 31, 2024Enforcement: Resolving — corrective action underway

TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2024 – December 23, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway

TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2024 – December 23, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway

TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2023 – December 31, 2023Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway

TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2023 – September 30, 2023Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway

TIER 3Resolved

Violation related to Coliform (pre-2016 TCR)

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: May 1, 2022 – May 31, 2022Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway

TIER 3Resolved

Monitoring Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: May 1, 2022 – May 31, 2022Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway

TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: April 1, 2022 – June 1, 2022Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway

TIER 3Resolved

Monitoring Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: November 1, 2021 – November 30, 2021Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway

Understanding violation severity

Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.

Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly

Frequently Asked Questions About UNALASKA WATER SYSTEM

Is UNALASKA WATER SYSTEM water safe to drink?

UNALASKA WATER SYSTEM water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 291 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has UNALASKA WATER SYSTEM detected?

35 contaminants were tested in UNALASKA WATER SYSTEM's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).

Does UNALASKA WATER SYSTEM have any EPA violations?

Yes, UNALASKA WATER SYSTEM has 291 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, MON, TT. 3 are health-based violations.

How many people does UNALASKA WATER SYSTEM serve?

UNALASKA WATER SYSTEM serves approximately 9,400 people, Alaska. The system provides water to 1 community: Unalaska.

What type of water does UNALASKA WATER SYSTEM provide?

UNALASKA WATER SYSTEM sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is AK2260309.

How does UNALASKA WATER SYSTEM compare to other utilities in Alaska?

UNALASKA WATER SYSTEM scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Alaska state page for a full comparison of water systems.

Cities Served