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KOLIGANEK WATER SYSTEM

PWS ID: AK2260040 · KOLIGANEK, Alaska 99576

KOLIGANEK WATER SYSTEM serves 170 people in KOLIGANEK, Alaska using Groundwater water sources. It has 492 recorded EPA violations, including 10 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: KOLIGANEK WATER SYSTEM

KOLIGANEK WATER SYSTEM is a native american-owned community water system that delivers drinking water to 170 residents in KOLIGANEK, Alaska (Dillingham Census Area County) through 40 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 492 total violations for this system , of which 10 (2%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 349 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 43 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Alaska, EPA tracks 1,326 public water systems serving 862,218 people, with 267,144 cumulative violations and 13,963 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 201.5 violations. KOLIGANEK WATER SYSTEM's 492 violations sit above the Alaska average. Statewide, 10 of 30 UCMR5-tested systems have reported PFAS detections (33.3%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
170
Total Violations
492
Health-Based Violations
10
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
40
County
Dillingham Census Area
School/Daycare
No
MCL Violations
0
Monitoring Violations
349
Treatment Tech Violations
10

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 43 2016
Lead and Copper Rule MR 23 2024
Chlorine MR 22 2005
Nitrate MR 18 2024
Groundwater Rule TT 10 2018
Consumer Confidence Rule Other 9 2021
p-Dichlorobenzene MR 6 2014
Carbon tetrachloride MR 6 2014
Trichloroethylene MR 6 2014
Benzene MR 6 2014
Revised Total Coliform Rule MON 6 2019
Vinyl chloride MR 6 2014
1,2-Dichloroethane MR 6 2014
1,1-Dichloroethylene MR 6 2014
1,1,1-Trichloroethane MR 6 2014
Arsenic MR 5 2014
Endrin MR 4 2010
BHC-GAMMA MR 4 2010
Toxaphene MR 4 2010
Dalapon MR 4 2010
Endothall MR 4 2010
Glyphosate MR 4 2010
OXAMYL MR 4 2010
Simazine MR 4 2010
Di(2-ethylhexyl) phthalate MR 4 2010
Picloram MR 4 2010
Hexachlorocyclopentadiene MR 4 2010
Carbofuran MR 4 2010
Atrazine MR 4 2010
LASSO MR 4 2010

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for KOLIGANEK WATER SYSTEM.

Federal Source of Truth

EPA SDWIS — Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID AK2260040 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Alaska Drinking Water Authority

Alaska's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find AK regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Lead and Copper Rule MR 23 SDWIS / AK2260040 / 5000
2024 Nitrate MR 18 SDWIS / AK2260040 / 1040
2021 Consumer Confidence Rule Other 9 SDWIS / AK2260040 / 7000
2019 Revised Total Coliform Rule MON 6 SDWIS / AK2260040 / 8000
2018 Groundwater Rule TT 10 SDWIS / AK2260040 / 0700
2016 Coliform (TCR) MR 43 SDWIS / AK2260040 / 3100
2014 p-Dichlorobenzene MR 6 SDWIS / AK2260040 / 2969
2014 Carbon tetrachloride MR 6 SDWIS / AK2260040 / 2982
2014 Trichloroethylene MR 6 SDWIS / AK2260040 / 2984
2014 Benzene MR 6 SDWIS / AK2260040 / 2990
2014 Vinyl chloride MR 6 SDWIS / AK2260040 / 2976
2014 1,2-Dichloroethane MR 6 SDWIS / AK2260040 / 2980
2014 1,1-Dichloroethylene MR 6 SDWIS / AK2260040 / 2977
2014 1,1,1-Trichloroethane MR 6 SDWIS / AK2260040 / 2981
2014 Arsenic MR 5 SDWIS / AK2260040 / 1005

How KOLIGANEK WATER SYSTEM Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric KOLIGANEK WATER SYSTEM Alaska avg Federal benchmark
Total violations 492 201.5 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 10 10.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 33.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 170 650 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,326 regulated public water systems in Alaska.

Federal MCL reference — Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is KOLIGANEK WATER SYSTEM water safe to drink? ▼
KOLIGANEK WATER SYSTEM (PWS ID: AK2260040) has 492 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 170 people using Groundwater sources.
How many people does KOLIGANEK WATER SYSTEM serve? ▼
KOLIGANEK WATER SYSTEM serves 170 people in KOLIGANEK, Alaska. It is a Native American-owned system using Groundwater water sources with 40 service connections.
What type of violations does KOLIGANEK WATER SYSTEM have? ▼
KOLIGANEK WATER SYSTEM has 492 total violations: 10 health-based violations (MCL exceedances or treatment failures), 349 monitoring/reporting violations, and 10 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in KOLIGANEK WATER SYSTEM water? ▼
No PFAS testing data is available for KOLIGANEK WATER SYSTEM under the EPA's UCMR5 monitoring program.
What water source does KOLIGANEK WATER SYSTEM use? ▼
KOLIGANEK WATER SYSTEM uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial