PlainWater
States → Alaska

Community Water System · PWS AK2380638

Tetlin Utility System

Tok, Alaska 99780-0797 - drinking water served from groundwater sources to 150 people, tracked in EPA SDWIS and UCMR5.

150
People served
1,153
EPA violations
24
Health-based
Untested
UCMR5 result

The verdict

EPA records 1,153 drinking-water violations at Tetlin Utility System, 2% of them health-based - above the Alaska per-system average.

1,153
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
150
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Tetlin Utility System

Tetlin Utility System is a native american-owned community water system that delivers drinking water to 150 residents in Tok, Alaska (Southeast Fairbanks Census Area County) through 4 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 1,153 total violations for this system , of which 24 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 1,027 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 121 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%).

Tetlin Utility System's 1,153 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
150
Total Violations
1,153
Health-Based Violations
24
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
4
County
Southeast Fairbanks Census Area
School/Daycare
No
MCL Violations
14
Monitoring Violations
1,027
Treatment Tech Violations
10

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 121 2016
Heptachlor epoxide MR 27 2001
ETHYLENE DIBROMIDE MR 27 2001
Chlordane MR 27 2001
Toxaphene MR 27 2001
BHC-GAMMA MR 27 2001
Methoxychlor MR 27 2001
Pentachlorophenol MR 27 2001
2,4,5-TP MR 27 2001
Total Polychlorinated Biphenyls (PCB) MR 27 2001
Atrazine MR 27 2001
Heptachlor MR 27 2001
2,4-D MR 26 2001
2,3,7,8-TCDD MR 15 2001
Di(2-ethylhexyl) phthalate MR 15 2001
Benzo(a)pyrene MR 15 2001
Simazine MR 15 2001
Glyphosate MR 15 2001
Endothall MR 15 2001
Dinoseb MR 15 2001
LASSO MR 15 2001
Hexachlorocyclopentadiene MR 15 2001
HEXACHLOROBENZENE MR 15 2001
Diquat MR 15 2001
Dalapon MR 15 2001
Endrin MR 15 2001
p-Dichlorobenzene MR 15 2021
Carbon tetrachloride MR 15 2021
1,1-Dichloroethylene MR 15 2021
Trichloroethylene MR 15 2021

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 Tetlin Utility 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 AK2380638 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
2022 Revised Total Coliform Rule MON 9 SDWIS / AK2380638 / 8000
2022 Lead and Copper Rule MR 3 SDWIS / AK2380638 / 5000
2021 p-Dichlorobenzene MR 15 SDWIS / AK2380638 / 2969
2021 Carbon tetrachloride MR 15 SDWIS / AK2380638 / 2982
2021 1,1-Dichloroethylene MR 15 SDWIS / AK2380638 / 2977
2021 Trichloroethylene MR 15 SDWIS / AK2380638 / 2984
2021 Benzene MR 15 SDWIS / AK2380638 / 2990
2021 1,2-Dichloroethane MR 15 SDWIS / AK2380638 / 2980
2021 1,1,1-Trichloroethane MR 15 SDWIS / AK2380638 / 2981
2021 Nitrate MR 14 SDWIS / AK2380638 / 1040
2021 Vinyl chloride MR 12 SDWIS / AK2380638 / 2976
2021 1,2,4-Trichlorobenzene MR 8 SDWIS / AK2380638 / 2378
2021 o-Dichlorobenzene MR 8 SDWIS / AK2380638 / 2968
2021 CHLOROBENZENE MR 8 SDWIS / AK2380638 / 2989
2021 Toluene MR 8 SDWIS / AK2380638 / 2991

How Tetlin Utility System Compares

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

Metric Tetlin Utility System Alaska avg Federal benchmark
Total violations 1,153 201.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 24 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 150 650 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 Tetlin Utility System water safe to drink? ▼
Tetlin Utility System (PWS ID: AK2380638) has 1153 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 150 people using Groundwater sources.
How many people does Tetlin Utility System serve? ▼
Tetlin Utility System serves 150 people in Tok, Alaska. It is a Native American-owned system using Groundwater water sources with 4 service connections.
What type of violations does Tetlin Utility System have? ▼
Tetlin Utility System has 1,153 total violations: 24 health-based violations (MCL exceedances or treatment failures), 1,027 monitoring/reporting violations, and 10 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Tetlin Utility System water? ▼
No PFAS testing data is available for Tetlin Utility System under the EPA's UCMR5 monitoring program.
What water source does Tetlin Utility System use? ▼
Tetlin Utility 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.