Public water system · AK2250134
ActiveLarsen Bay Water System
At a glance
Larsen Bay Water System (PWSID AK2250134) is an active community water system in Kodiak Island Borough County, Alaska. It reports serving 271 people through 89 service connections. Its primary water source is surface water, and EPA lists it as Native American-owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in March 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
271
Service connections
89
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Larsen Bay Water System compare with other water systems in Kodiak Island Borough County?
By EPA's size categories, Larsen Bay Water System is a very small system (500 people or fewer). Kodiak Island Borough County has 15 active public water systems, and Larsen Bay Water System is the 3rd-largest of them by population served. Its population served is well below the county average of 940 people per system, and accounts for 1.9% of the 14,105 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 Larsen Bay 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 150 Alaska systems (11%) list surface water as their primary source.
Who owns and regulates Larsen Bay Water System?
EPA lists Larsen Bay 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. 6 of the 15 active systems in Kodiak Island Borough County (40%) are also Native American-owned.
Does Larsen Bay Water System have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in March 2026. The violations listed here began between January 2025 and March 2026. By type: 11 monitoring and reporting and 1 monitoring. The contaminants or rules involved are Revised Total Coliform Rule, Nitrate, 1,2-Dichloropropane and Xylenes, Total. EPA lists 12 as archived. 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 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloropropanecode 2983 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Xylenes, Totalcode 2955 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Tetrachloroethylenecode 2987 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Trichloroethylenecode 2984 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylbenzenecode 2992 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Styrenecode 2996 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,1-Trichloroethanecode 2981 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | p-Dichlorobenzenecode 2969 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Archived |
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.
Larsen Bay Water System: frequently asked questions
Who runs Larsen Bay Water System?
Larsen Bay Water System (PWSID AK2250134) is a community water system Native American-owned. It is regulated by the AK state drinking water program.
How many people does Larsen Bay Water System serve?
Larsen Bay Water System reports serving 271 people through 89 service connections in Kodiak Island Borough County, Alaska.
Where does Larsen Bay Water System get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Larsen Bay Water System have any drinking water violations?
Of the 12 most recent violations in EPA's records, none 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 Larsen Bay 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, none 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 Larsen Bay Water System's water quality report?
As a community water system, Larsen Bay 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 Kodiak Island Borough County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Kodiak Water System | Kodiak Island Borough | 9,547 | Community | Surface water |
| Uscg Station Kodiak | Kodiak Island Borough | 3,092 | Community | Surface water |
| Old Harbor | Kodiak Island Borough | 246 | Community | Surface water |
| Port Lions | Kodiak Island Borough | 175 | Community | Surface water |
| Bells Flats | Kodiak Island Borough | 150 | Transient non-community | Groundwater |
| Ouzinkie Water System | Kodiak Island Borough | 144 | 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, “Larsen Bay Water System, PWSID AK2250134, Alaska”, https://aquacensus.com/water-systems/alaska/larsen-bay-water-system-ak2250134 (data as of October 1, 2026).