States ›Alaska ›Yukon-Koyukuk Census Area ›Chalkyitsik

Chalkyitsik, AK Tap Water Quality 2026

Water quality report for Chalkyitsik, AK — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Chalkyitsik's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Chalkyitsik Village Water PWSID: AK2300183 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 5.50 ppb, 37% of the action level and no violations are open. PFAS has never been sampled at this system.

D

Chalkyitsik earns a D for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 5.50 ppb — 37% of the federal action level
PFAS never sampled at this system
213 violations since 2015, 38 health-based
No violations currently open
Chalkyitsik's lead level vs. all Alaska community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 5.50 ppb — 37% of the federal action level
✓ Lower lead than 16% of Alaska utilities
Population Served
~3 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
213 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
37% of EPA action level
5.50 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
103.8% of EPA action level
1,350 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 5.50 ppb, 37% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Lead and Copper Rule MONITORING AND REPORTING — TT 2026 Unaddressed
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2026 Archived
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2026 Archived
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2025 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.136 MG/L 0.060 mg/L 2025 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Unaddressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2025 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
TTHM MCL EXCEEDANCE 0.122 MG/L 0.080 mg/L 2025 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.273 MG/L 0.060 mg/L 2025 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2024 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2024 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.149 MG/L 0.060 mg/L 2024 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2024 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2024 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2024 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2024 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2024 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
TTHM MCL EXCEEDANCE 0.089 MG/L 0.080 mg/L 2024 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.12 MG/L 0.060 mg/L 2024 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
TTHM MCL EXCEEDANCE 0.103 MG/L 0.080 mg/L 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Public Notice OTHER — — 2024 Resolved
TTHM MCL EXCEEDANCE 0.091 MG/L 0.080 mg/L 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
TTHM MCL EXCEEDANCE 0.108 MG/L 0.080 mg/L 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.062 MG/L 0.060 mg/L 2023 Resolved
TTHM MCL EXCEEDANCE 0.132 MG/L 0.080 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2023 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2023 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
TTHM MCL EXCEEDANCE 0.107 MG/L 0.080 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
Public Notice OTHER — — 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
TTHM MCL EXCEEDANCE 0.124 MG/L 0.080 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.065 MG/L 0.060 mg/L 2023 Resolved
Public Notice OTHER — — 2023 Resolved
TTHM MCL EXCEEDANCE 0.14 MG/L 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.077 MG/L 0.060 mg/L 2022 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Resolved
TTHM MCL EXCEEDANCE 0.103 MG/L 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2022 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2022 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2022 Resolved
TTHM MCL EXCEEDANCE 0.123 MG/L 0.080 mg/L 2022 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2022 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2022 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2022 Resolved
TTHM MCL EXCEEDANCE 0.123 MG/L 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2022 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2021 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2021 Resolved
TTHM MCL EXCEEDANCE 0.101 MG/L 0.080 mg/L 2021 Resolved
Public Notice OTHER — — 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Archived
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2021 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2021 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021 Resolved
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2021 Resolved
Public Notice OTHER — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
TTHM MCL EXCEEDANCE 0.099 MG/L 0.080 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.067 MG/L 0.060 mg/L 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021 Resolved
Public Notice OTHER — — 2021 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021 Resolved
TTHM MCL EXCEEDANCE 0.099 MG/L 0.080 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.067 MG/L 0.060 mg/L 2021 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2021 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2021 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2021 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2021 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2021 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2021 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2021 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2021 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2021 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2021 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2021 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2021 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2021 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.067 MG/L 0.060 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 0.099 MG/L 0.080 mg/L 2020 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2020 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2019 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2019 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2019 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2018 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2018 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2018 Resolved
E. COLI MONITORING AND REPORTING — 0 2017 Resolved
E. COLI MONITORING AND REPORTING — 0 2017 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2017 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2017 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2017 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2017 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2016 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2016 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.077 MG/L 0.060 mg/L 2015 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.126 MG/L 0.060 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 0.093 MG/L 0.080 mg/L 2015 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.116 MG/L 0.060 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 0.091 MG/L 0.080 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

213 violations are on record since 2015, of which 38 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Chalkyitsik Village Water
PWSID AK2300183
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served
Service connections 3
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Chalkyitsik tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 5.50 ppb, 37% of the action level.
Does Chalkyitsik water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Chalkyitsik? ▼
Chalkyitsik Village Water (PWSID AK2300183). Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2025-08-13. Inspectors recorded 2 significant deficiencies.

What Should Chalkyitsik Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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