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Community Water System · PWS AK2120169

Klawock

Klawock, Alaska 99925 - drinking water served from surface water sources to 904 people, tracked in EPA SDWIS and UCMR5.

904
People served
897
EPA violations
135
Health-based
Untested
UCMR5 result

The verdict

EPA records 897 drinking-water violations at Klawock, 15% of them health-based - above the Alaska per-system average.

897
Total EPA violations on record
15%
Health-based (MCL / treatment failure)
904
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Klawock

Klawock is a native american-owned community water system that delivers drinking water to 904 residents in Klawock, Alaska through 1,084 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 897 total violations for this system , of which 135 (15%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 569 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 Interim Enhanced Surface Water Treatment Rule, recorded in 93 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%).

Klawock's 897 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
904
Total Violations
897
Health-Based Violations
135
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Native American
Connections
1,084
School/Daycare
No
MCL Violations
100
Monitoring Violations
569
Treatment Tech Violations
35

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Interim Enhanced Surface Water Treatment Rule MR 93 2024
Total Haloacetic Acids (HAA5) MCL 70 2025
Surface Water Treatment Rule MR 49 2024
Total Haloacetic Acids (HAA5) MR 34 2017
TTHM MR 32 2017
Surface Water Treatment Rule TT 29 2018
TTHM MCL 29 2012
cis-1,2-Dichloroethylene MR 10 2017
DICHLOROMETHANE MR 10 2017
1,1-Dichloroethylene MR 10 2017
trans-1,2-Dichloroethylene MR 10 2017
1,2-Dichloropropane MR 10 2017
Trichloroethylene MR 10 2017
CHLOROBENZENE MR 10 2017
Toluene MR 10 2017
Styrene MR 10 2017
Xylenes, Total MR 10 2017
o-Dichlorobenzene MR 10 2017
p-Dichlorobenzene MR 10 2017
1,1,2-Trichloroethane MR 10 2017
Tetrachloroethylene MR 10 2017
1,2-Dichloroethane MR 10 2017
1,1,1-Trichloroethane MR 10 2017
Carbon tetrachloride MR 10 2017
Ethylbenzene MR 10 2017
1,2,4-Trichlorobenzene MR 10 2017
Benzene MR 10 2017
Vinyl chloride MR 9 2017
Consumer Confidence Rule Other 9 2021
Coliform (TCR) MR 8 2015

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 Klawock.

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 AK2120169 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 Total Haloacetic Acids (HAA5) MCL 70 SDWIS / AK2120169 / 2456
2024 Interim Enhanced Surface Water Treatment Rule MR 93 SDWIS / AK2120169 / 0300
2024 Surface Water Treatment Rule MR 49 SDWIS / AK2120169 / 0200
2021 Consumer Confidence Rule Other 9 SDWIS / AK2120169 / 7000
2020 Revised Total Coliform Rule MON 1 SDWIS / AK2120169 / 8000
2018 Surface Water Treatment Rule TT 29 SDWIS / AK2120169 / 0200
2018 E. COLI MR 3 SDWIS / AK2120169 / 3014
2017 Total Haloacetic Acids (HAA5) MR 34 SDWIS / AK2120169 / 2456
2017 TTHM MR 32 SDWIS / AK2120169 / 2950
2017 cis-1,2-Dichloroethylene MR 10 SDWIS / AK2120169 / 2380
2017 DICHLOROMETHANE MR 10 SDWIS / AK2120169 / 2964
2017 1,1-Dichloroethylene MR 10 SDWIS / AK2120169 / 2977
2017 trans-1,2-Dichloroethylene MR 10 SDWIS / AK2120169 / 2979
2017 1,2-Dichloropropane MR 10 SDWIS / AK2120169 / 2983
2017 Trichloroethylene MR 10 SDWIS / AK2120169 / 2984

How Klawock Compares

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

Metric Klawock Alaska avg Federal benchmark
Total violations 897 201.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 135 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 904 650 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 Klawock water safe to drink? ▼
Klawock (PWS ID: AK2120169) has 897 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 904 people using Surface Water sources.
How many people does Klawock serve? ▼
Klawock serves 904 people in Klawock, Alaska. It is a Native American-owned system using Surface Water water sources with 1,084 service connections.
What type of violations does Klawock have? ▼
Klawock has 897 total violations: 135 health-based violations (MCL exceedances or treatment failures), 569 monitoring/reporting violations, and 35 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Klawock water? ▼
No PFAS testing data is available for Klawock under the EPA's UCMR5 monitoring program.
What water source does Klawock use? ▼
Klawock 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.