Public water system · AK2340167
ActiveKoyuk Public Water System
At a glance
Koyuk Public Water System (PWSID AK2340167) is an active community water system in Nome Census Area County, Alaska. It reports serving 277 people through 79 service connections. Its primary water source is groundwater under influence of surface water, and EPA lists it as Native American-owned. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in March 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
277
Service connections
79
Primary source
GU
Groundwater under influence of surface water
System type
CWS
Community water system
System record
How does Koyuk Public Water System compare with other water systems in Nome Census Area County?
By EPA's size categories, Koyuk Public Water System is a very small system (500 people or fewer). Nome Census Area County has 17 active public water systems. Its population served is about half of the county average of 607 people per system, and accounts for 2.7% of the 10,325 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 Koyuk Public 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 under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules. 28 Alaska systems (2.1%) list groundwater under influence of surface water as their primary source.
Who owns and regulates Koyuk Public Water System?
EPA lists Koyuk Public 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. 16 of the 17 active systems in Nome Census Area County (94%) are also Native American-owned.
Does Koyuk Public Water System have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in March 2026. The violations listed here began between October 2024 and March 2026. By type: 7 monitoring and reporting, 3 monitoring, 1 reporting and 1 required treatment not met. The contaminant or rule involved most often is Surface Water Treatment Rule (4 of them). EPA lists 11 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2026-03-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Archived |
| 2025-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2025-07-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2025-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-05-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2025-05-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2025-05-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2024-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2024-11-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2024-11-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2024-10-17 | ReportingLSL Reporting · code 4G | Lead and Copper Rule Revisionscode 5200 | No | Resolved |
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | 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.
Koyuk Public Water System: frequently asked questions
Who runs Koyuk Public Water System?
Koyuk Public Water System (PWSID AK2340167) is a community water system Native American-owned. It is regulated by the AK state drinking water program.
How many people does Koyuk Public Water System serve?
Koyuk Public Water System reports serving 277 people through 79 service connections in Nome Census Area County, Alaska.
Where does Koyuk Public Water System get its water?
EPA SDWIS lists this system's primary water source as groundwater under influence of surface water. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules.
Does Koyuk Public Water System have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in March 2026. 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 Koyuk Public 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, one is health-based, and the most recent began in March 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the AK state drinking water program.
Where can I find Koyuk Public Water System's water quality report?
As a community water system, Koyuk Public 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 Nome Census Area County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Nome Joint Utility System | Nome Census Area | 3,920 | Community | Groundwater |
| Savoonga Water Supply | Nome Census Area | 802 | Community | Groundwater |
| Unalakleet City Water Supply | Nome Census Area | 757 | Community | Groundwater |
| Gambell Water System | Nome Census Area | 669 | Community | Groundwater under influence of surface water |
| Stebbins City Water Supply | Nome Census Area | 590 | Community | Surface water |
| Shishmaref Water System | Nome Census Area | 572 | Community | Surface water |
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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, “Koyuk Public Water System, PWSID AK2340167, Alaska”, https://aquacensus.com/water-systems/alaska/koyuk-public-water-system-ak2340167 (data as of October 1, 2026).