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Tap water quality report

Klawock

EPA monitoring tested this supplier for 37 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

37
contaminants tested
11
detected
904
people served
139
health-based violations
Alaska rankingsLead in AlaskaPFAS in Alaska
Water source
Surface water
Ownership
Native American

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

139
health-based violations
718
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2026-01-01 → 2026-03-31
MCL Health-based Archived 2025-10-01 → 2025-12-31
MCL Health-based Archived 2025-10-01 → 2025-12-31
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2025-04-01 → 2025-06-30
MCL Health-based Archived 2025-04-01 → 2025-06-30
MCL Health-based Archived 2025-01-01 → 2025-03-31
MCL Health-based Archived 2025-01-01 → 2025-03-31
MCL Health-based Archived 2024-10-01 → 2024-12-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
117.65 µg/L 147%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 136 µg/L
32/33 SYR4 2012–2019
Chloroform
127 µg/L
No EPA limit set
worst single sample: 133 µg/L
31/32 SYR4 2012–2019
Bromodichloromethane
3.612 µg/L
No EPA limit set
worst single sample: 3.8 µg/L
29/32 SYR4 2012–2019
Trichloroacetic Acid
77.4 µg/L
No EPA limit set
worst single sample: 90 µg/L
27/30 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
96.775 µg/L 161%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
worst single sample: 144.8 µg/L
26/30 SYR4 2012–2019
Dichloroacetic Acid
31 µg/L
No EPA limit set
worst single sample: 47 µg/L
23/30 SYR4 2012–2019
Copper
615.45 µg/L 47%
of the EPA limit 1300 µg/L
worst single sample: 700 µg/L
20/20 SYR4 2015–2018
Lead
3.648 µg/L 24%
of the EPA limit 15 µg/L
worst single sample: 6.87 µg/L
19/20 SYR4 2015–2018
Lead
0.0036 mg/L 24%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2024
Monochloroacetic Acid
7.18 µg/L
No EPA limit set
worst single sample: 7.8 µg/L
5/30 SYR4 2012–2019
Combined Radium (-226 And -228)
1.66 pCi/L 33%
of the EPA limit 5 pCi/L
 1/1 SYR4 2016
26 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneBenzeneBromoformChlorobenzeneCarbon TetrachlorideDichloromethaneDibromoacetic AcidDibromochloromethaneEthylbenzeneMonobromoacetic AcidNitrate-NitriteStyreneTetrachloroethyleneTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
CITY OF KLAWOCK
Phone
907-755-2261
Email
[email protected]

Frequently asked questions about Klawock

Is Klawock tap water safe to drink?

EPA monitoring detected 11 contaminants in Klawock's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Klawock's water?

EPA monitoring detected TTHM, Chloroform, Bromodichloromethane, Trichloroacetic Acid, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Klawock serve?

Klawock reports serving 904 people in Alaska, per its EPA record.

Has Klawock had any water quality violations?

The EPA has 718 violations on file for Klawock, of which 139 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.