Public water system · AK2260040
ActiveKoliganek Water System
At a glance
Koliganek Water System (PWSID AK2260040) is an active community water system in Dillingham Census Area County, Alaska. It reports serving 170 people through 40 service connections. Its primary water source is groundwater, and EPA lists it as Native American-owned. Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in March 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
170
Service connections
40
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Koliganek Water System compare with other water systems in Dillingham Census Area County?
By EPA's size categories, Koliganek Water System is a very small system (500 people or fewer). Dillingham Census Area County has 24 active public water systems. Its population served is about 41% below the county average of 288 people per system, and accounts for 2.5% of the 6,913 people reported by systems filed under the county. Across Alaska, the 1,322 active systems average 653 people each. Nationally, the average active community water system reports serving 6,703 people, so Koliganek Water System is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Alaska has 406 active community water systems, 31% of the state's 1,322 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,054 Alaska systems (80%) list groundwater as their primary source.
Who owns and regulates Koliganek Water System?
EPA lists Koliganek Water System as Native American-owned. The AK state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 12 of the 24 active systems in Dillingham Census Area County (50%) are also Native American-owned.
Does Koliganek Water System have drinking water violations?
Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in March 2024. The violations listed here began between August 2018 and March 2024. By type: 5 monitoring and reporting, 4 required treatment not met, 2 public notice, recordkeeping or other and 1 monitoring. The contaminant or rule involved most often is Groundwater Rule (4 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2024-03-20 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2024-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2023-07-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2021-10-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2019-10-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2019-09-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2018-08-27 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2018-08-27 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2018-08-27 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2018-08-27 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Koliganek Water System: frequently asked questions
Who runs Koliganek Water System?
Koliganek Water System (PWSID AK2260040) is a community water system Native American-owned. It is regulated by the AK state drinking water program.
How many people does Koliganek Water System serve?
Koliganek Water System reports serving 170 people through 40 service connections in Dillingham Census Area County, Alaska.
Where does Koliganek Water System get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Koliganek Water System have any drinking water violations?
Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in March 2024. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Koliganek Water System's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in March 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the AK state drinking water program.
Where can I find Koliganek Water System's water quality report?
As a community water system, Koliganek Water System must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Dillingham Census Area County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Dillingham Water System | Dillingham Census Area | 2,419 | Community | Groundwater |
| Togiak Water System | Dillingham Census Area | 910 | Community | Groundwater |
| New Stuyahok Water System | Dillingham Census Area | 566 | Community | Groundwater |
| Bbahc - Kanakanak Hospital | Dillingham Census Area | 305 | Community | Groundwater |
| Silver Bay Seafoods - Wood River | Dillingham Census Area | 300 | Transient non-community | Groundwater |
| Manokotak Water System | Dillingham Census Area | 293 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Koliganek Water System, PWSID AK2260040, Alaska”, https://aquacensus.com/water-systems/alaska/koliganek-water-system-ak2260040 (data as of October 1, 2026).