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Non-Transient Non-Community Water System · PWS AK2380379

AK Gateway SD - Mentasta Lake

Tok, Alaska 99780-0226 - drinking water served from groundwater sources to 43 people, tracked in EPA SDWIS and UCMR5.

43
People served
252
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 252 drinking-water violations at AK Gateway SD - Mentasta Lake - above the Alaska per-system average.

252
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
43
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: AK Gateway SD - Mentasta Lake

AK Gateway SD - Mentasta Lake is a local-owned non-transient non-community water system that delivers drinking water to 43 residents in Tok, Alaska (Valdez-Cordova Census Area County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 252 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 221 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 45 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%).

AK Gateway SD - Mentasta Lake's 252 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
43
Total Violations
252
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
1
County
Valdez-Cordova Census Area
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
221
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 45 2015
Lead and Copper Rule MR 20 2002
Nitrate MR 11 2021
Pentachlorophenol MR 8 1995
Heptachlor MR 8 1995
ETHYLENE DIBROMIDE MR 8 1995
Aldicarb sulfone MR 8 1995
Aldicarb sulfoxide MR 8 1995
Aldicarb MR 8 1995
2,4-D MR 8 1995
Toxaphene MR 8 1995
BHC-GAMMA MR 8 1995
Methoxychlor MR 8 1995
Heptachlor epoxide MR 8 1995
Chlordane MR 8 1995
Atrazine MR 8 1995
Total Polychlorinated Biphenyls (PCB) MR 8 1995
2,4,5-TP MR 8 1995
Fluoride MR 2 1999
Selenium MR 2 1999
Mercury MR 2 1999
Chromium MR 2 1999
Cadmium MR 2 1999
Thallium, Total MR 2 1999
Barium MR 2 1999
Beryllium, Total MR 2 1999
Antimony, Total MR 2 1999
Nickel MR 2 1999
CYANIDE MR 2 1999
Arsenic MR 2 1999

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 AK Gateway SD - Mentasta Lake.

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 AK2380379 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
2021 Nitrate MR 11 SDWIS / AK2380379 / 1040
2015 Coliform (TCR) MR 45 SDWIS / AK2380379 / 3100
2002 Lead and Copper Rule MR 20 SDWIS / AK2380379 / 5000
1999 Fluoride MR 2 SDWIS / AK2380379 / 1025
1999 Selenium MR 2 SDWIS / AK2380379 / 1045
1999 Mercury MR 2 SDWIS / AK2380379 / 1035
1999 Chromium MR 2 SDWIS / AK2380379 / 1020
1999 Cadmium MR 2 SDWIS / AK2380379 / 1015
1999 Thallium, Total MR 2 SDWIS / AK2380379 / 1085
1999 Barium MR 2 SDWIS / AK2380379 / 1010
1999 Beryllium, Total MR 2 SDWIS / AK2380379 / 1075
1999 Antimony, Total MR 2 SDWIS / AK2380379 / 1074
1999 Nickel MR 2 SDWIS / AK2380379 / 1036
1999 CYANIDE MR 2 SDWIS / AK2380379 / 1024
1999 Arsenic MR 2 SDWIS / AK2380379 / 1005

How AK Gateway SD - Mentasta Lake Compares

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

Metric AK Gateway SD - Mentasta Lake Alaska avg Federal benchmark
Total violations 252 201.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 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 43 650 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 AK Gateway SD - Mentasta Lake water safe to drink? ▼
AK Gateway SD - Mentasta Lake (PWS ID: AK2380379) has 252 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 43 people using Groundwater sources.
How many people does AK Gateway SD - Mentasta Lake serve? ▼
AK Gateway SD - Mentasta Lake serves 43 people in Tok, Alaska. It is a Local-owned system using Groundwater water sources with 1 service connections.
What type of violations does AK Gateway SD - Mentasta Lake have? ▼
AK Gateway SD - Mentasta Lake has 252 total violations: 0 health-based violations (MCL exceedances or treatment failures), 221 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in AK Gateway SD - Mentasta Lake water? ▼
No PFAS testing data is available for AK Gateway SD - Mentasta Lake under the EPA's UCMR5 monitoring program.
What water source does AK Gateway SD - Mentasta Lake use? ▼
AK Gateway SD - Mentasta Lake uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.