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Community Water System · PWS AK2320094

Nsbu - Atqasuk

Anchorage, Alaska 99518 - drinking water served from surface water sources to 284 people, tracked in EPA SDWIS and UCMR5.

284
People served
357
EPA violations
51
Health-based
Untested
UCMR5 result

The verdict

EPA records 357 drinking-water violations at Nsbu - Atqasuk, 14% of them health-based - above the Alaska per-system average.

357
Total EPA violations on record
14%
Health-based (MCL / treatment failure)
284
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Nsbu - Atqasuk

Nsbu - Atqasuk is a native american-owned community water system that delivers drinking water to 284 residents in Anchorage, Alaska (North Slope Borough County) through 72 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 357 total violations for this system , of which 51 (14%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 239 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 Surface Water Treatment Rule, recorded in 124 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. Statewide, 10 of 30 UCMR5-tested systems have reported PFAS detections (33.3%).

Nsbu - Atqasuk's 357 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
284
Total Violations
357
Health-Based Violations
51
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Native American
Connections
72
County
North Slope Borough
School/Daycare
No
MCL Violations
0
Monitoring Violations
239
Treatment Tech Violations
51

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule MR 124 2024
Surface Water Treatment Rule TT 51 1998
Coliform (TCR) MR 19 2011
Chlorine MR 11 2024
Consumer Confidence Rule Other 6 2019
Fluoride MR 5 1990
Nitrate MR 4 2000
DICHLOROMETHANE MR 3 2000
1,1,1-Trichloroethane MR 3 2000
Xylenes, Total MR 3 2000
CHLOROBENZENE MR 3 2000
Toluene MR 3 2000
Ethylbenzene MR 3 2000
1,2-Dichloropropane MR 3 2000
cis-1,2-Dichloroethylene MR 3 2000
trans-1,2-Dichloroethylene MR 3 2000
1,1-Dichloroethylene MR 3 2000
Trichloroethylene MR 3 2000
1,2-Dichloroethane MR 3 2000
1,2,4-Trichlorobenzene MR 3 2000
1,1,2-Trichloroethane MR 3 2000
Tetrachloroethylene MR 3 2000
Styrene MR 3 2000
Benzene MR 3 2000
Lead and Copper Rule MR 3 1997
p-Dichlorobenzene MR 3 2000
o-Dichlorobenzene MR 3 2000
Carbon tetrachloride MR 3 2000
Long Term 2 Enhanced Surface Water Treatment Rule MR 1 2008
Arsenic MR 1 1989

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 Nsbu - Atqasuk.

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 AK2320094 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 Surface Water Treatment Rule MR 124 SDWIS / AK2320094 / 0200
2024 Chlorine MR 11 SDWIS / AK2320094 / 0999
2019 Consumer Confidence Rule Other 6 SDWIS / AK2320094 / 7000
2011 Coliform (TCR) MR 19 SDWIS / AK2320094 / 3100
2008 Long Term 2 Enhanced Surface Water Treatment Rule MR 1 SDWIS / AK2320094 / 0800
2000 Nitrate MR 4 SDWIS / AK2320094 / 1040
2000 DICHLOROMETHANE MR 3 SDWIS / AK2320094 / 2964
2000 1,1,1-Trichloroethane MR 3 SDWIS / AK2320094 / 2981
2000 Xylenes, Total MR 3 SDWIS / AK2320094 / 2955
2000 CHLOROBENZENE MR 3 SDWIS / AK2320094 / 2989
2000 Toluene MR 3 SDWIS / AK2320094 / 2991
2000 Ethylbenzene MR 3 SDWIS / AK2320094 / 2992
2000 1,2-Dichloropropane MR 3 SDWIS / AK2320094 / 2983
2000 cis-1,2-Dichloroethylene MR 3 SDWIS / AK2320094 / 2380
2000 trans-1,2-Dichloroethylene MR 3 SDWIS / AK2320094 / 2979

How Nsbu - Atqasuk Compares

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

Metric Nsbu - Atqasuk Alaska avg Federal benchmark
Total violations 357 201.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 51 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 284 650 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 Nsbu - Atqasuk water safe to drink? ▼
Nsbu - Atqasuk (PWS ID: AK2320094) has 357 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 284 people using Surface Water sources.
How many people does Nsbu - Atqasuk serve? ▼
Nsbu - Atqasuk serves 284 people in Anchorage, Alaska. It is a Native American-owned system using Surface Water water sources with 72 service connections.
What type of violations does Nsbu - Atqasuk have? ▼
Nsbu - Atqasuk has 357 total violations: 51 health-based violations (MCL exceedances or treatment failures), 239 monitoring/reporting violations, and 51 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Nsbu - Atqasuk water? ▼
No PFAS testing data is available for Nsbu - Atqasuk under the EPA's UCMR5 monitoring program.
What water source does Nsbu - Atqasuk use? ▼
Nsbu - Atqasuk uses Surface Water 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.