PlainWater
States → Alaska

Community Water System · PWS AK2340565

Kobuk Water System

Kobuk, Alaska 99751-0019 - drinking water served from groundwater sources to 93 people, tracked in EPA SDWIS and UCMR5.

93
People served
752
EPA violations
62
Health-based
Untested
UCMR5 result

The verdict

EPA records 752 drinking-water violations at Kobuk Water System, 8% of them health-based - above the Alaska per-system average.

752
Total EPA violations on record
8%
Health-based (MCL / treatment failure)
93
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Kobuk Water System

Kobuk Water System is a native american-owned community water system that delivers drinking water to 93 residents in Kobuk, Alaska (Northwest Arctic Borough County) through 31 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 752 total violations for this system , of which 62 (8%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 565 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Groundwater Rule, recorded in 58 violations (TT, health-based). 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. Statewide, 10 of 30 UCMR5-tested systems have reported PFAS detections (33.3%).

Kobuk Water System's 752 violations sit above the Alaska average.

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
93
Total Violations
752
Health-Based Violations
62
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
31
County
Northwest Arctic Borough
School/Daycare
No
MCL Violations
4
Monitoring Violations
565
Treatment Tech Violations
58

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Groundwater Rule TT 58 2024
Groundwater Rule MR 39 2025
Gross Alpha, Excl. Radon and U MR 30 2007
Combined Uranium MR 28 2007
Combined Radium (-226 and -228) MR 28 2007
Consumer Confidence Rule Other 21 2014
Coliform (TCR) MR 21 2015
Chlorine MR 18 2025
Nitrate MR 16 2023
Pentachlorophenol MR 13 2010
Heptachlor epoxide MR 13 2010
Heptachlor MR 13 2010
2,4,5-TP MR 13 2010
Toxaphene MR 13 2010
BHC-GAMMA MR 13 2010
Methoxychlor MR 13 2010
Total Polychlorinated Biphenyls (PCB) MR 13 2010
Chlordane MR 13 2010
2,4-D MR 13 2010
Atrazine MR 13 2010
Aldicarb sulfone MR 10 1995
Aldicarb MR 10 1995
Total Haloacetic Acids (HAA5) MR 10 2020
TTHM MR 10 2020
Aldicarb sulfoxide MR 10 1995
Public Notice Other 7 2024
Revised Total Coliform Rule MON 6 2025
1,1,1-Trichloroethane MR 5 2023
o-Dichlorobenzene MR 5 2023
Carbon tetrachloride MR 5 2023

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 Kobuk 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 AK2340565 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
2025 Groundwater Rule MR 39 SDWIS / AK2340565 / 0700
2025 Chlorine MR 18 SDWIS / AK2340565 / 0999
2025 Revised Total Coliform Rule MON 6 SDWIS / AK2340565 / 8000
2024 Groundwater Rule TT 58 SDWIS / AK2340565 / 0700
2024 Public Notice Other 7 SDWIS / AK2340565 / 7500
2024 Lead and Copper Rule MR 5 SDWIS / AK2340565 / 5000
2023 Nitrate MR 16 SDWIS / AK2340565 / 1040
2023 1,1,1-Trichloroethane MR 5 SDWIS / AK2340565 / 2981
2023 o-Dichlorobenzene MR 5 SDWIS / AK2340565 / 2968
2023 Carbon tetrachloride MR 5 SDWIS / AK2340565 / 2982
2023 Tetrachloroethylene MR 5 SDWIS / AK2340565 / 2987
2023 1,2-Dichloropropane MR 5 SDWIS / AK2340565 / 2983
2023 cis-1,2-Dichloroethylene MR 5 SDWIS / AK2340565 / 2380
2023 1,1-Dichloroethylene MR 5 SDWIS / AK2340565 / 2977
2023 Trichloroethylene MR 5 SDWIS / AK2340565 / 2984

How Kobuk Water System Compares

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

Metric Kobuk Water System Alaska avg Federal benchmark
Total violations 752 201.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 62 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 93 650 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 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Kobuk Water System water safe to drink? ▼
Kobuk Water System (PWS ID: AK2340565) has 752 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 93 people using Groundwater sources.
How many people does Kobuk Water System serve? ▼
Kobuk Water System serves 93 people in Kobuk, Alaska. It is a Native American-owned system using Groundwater water sources with 31 service connections.
What type of violations does Kobuk Water System have? ▼
Kobuk Water System has 752 total violations: 62 health-based violations (MCL exceedances or treatment failures), 565 monitoring/reporting violations, and 58 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Kobuk Water System water? ▼
No PFAS testing data is available for Kobuk Water System under the EPA's UCMR5 monitoring program.
What water source does Kobuk Water System use? ▼
Kobuk 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.
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.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.