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Tap water quality report

Unalaska Water

EPA monitoring tested this supplier for 79 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

79
contaminants tested
17
detected
9,400
people served
3
health-based violations
Alaska rankingsLead in AlaskaPFAS in Alaska
Water source
Surface water
Ownership
Local government
Counties served
Aleutians West Census Area

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.

3
health-based violations
300
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2004-01-01 → 2004-01-31
TT Health-based Resolved 2003-03-01 → 2003-03-31
TT Health-based Resolved 2003-01-01 → 2003-01-31
MR Monitoring Resolved 2025-10-01 → 2025-12-31
MR Monitoring Resolved 2025-10-01 → 2025-12-31
MON Monitoring Resolved 2024-05-01 → 2024-05-31
MR Monitoring Resolved 2024-05-01 → 2024-05-31
MR Monitoring Resolved 2024-05-01 → 2024-05-31
MR Monitoring Resolved 2024-01-01 → 2024-12-31
MR Monitoring Resolved 2024-01-01 → 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
Copper
1189 µg/L 91%
of the EPA limit 1300 µg/L
worst single sample: 2700 µg/L
60/60 SYR4 2012–2018
Lead
24.4 µg/L 163%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 71.7 µg/L
51/60 SYR4 2012–2018
Bromodichloromethane
9.33 µg/L
No EPA limit set
worst single sample: 11.8 µg/L
43/45 SYR4 2012–2019
Chloroform
28.61 µg/L
No EPA limit set
worst single sample: 29 µg/L
43/45 SYR4 2012–2019
Dibromochloromethane
3.509 µg/L
No EPA limit set
worst single sample: 4.74 µg/L
43/45 SYR4 2012–2019
TTHM
40 µg/L 50%
of the EPA limit 80 µg/L
worst single sample: 40.8 µg/L
41/45 SYR4 2012–2019
Dichloroacetic Acid
17 µg/L
No EPA limit set
worst single sample: 20 µg/L
40/45 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
36.295 µg/L 60%
of the EPA limit 60 µg/L
worst single sample: 42 µg/L
40/45 SYR4 2012–2019
Trichloroacetic Acid
21.05 µg/L
No EPA limit set
worst single sample: 23 µg/L
40/45 SYR4 2012–2019
Lead
0.0031 mg/L 20%
of the EPA limit 0.0150 mg/L
 23/23 LCR 2024
Nitrate-Nitrite
140 µg/L 1.4%
of the EPA limit 10000 µg/L
 8/48 SYR4 2012–2019
Dibromoacetic Acid
1.275 µg/L
No EPA limit set
worst single sample: 1.34 µg/L
6/45 SYR4 2012–2019
Arsenic
2.575 µg/L 26%
of the EPA limit 10 µg/L
worst single sample: 2.66 µg/L
3/6 SYR4 2012–2018
Combined Uranium
0.3486 µg/L 1.2%
of the EPA limit 30 µg/L
worst single sample: 0.3520 µg/L
2/2 SYR4 2013
Barium
6.7 µg/L 0.3%
of the EPA limit 2000 µg/L
 1/3 SYR4 2015
Bromoform
0.5090 µg/L
No EPA limit set
 1/45 SYR4 2012–2019
Monochloroacetic Acid
21 µg/L
No EPA limit set
 1/45 SYR4 2012–2019
62 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideChromiumCombined Radium (-226 And -228)DichloromethaneEthylbenzeneFluorideHfpo-DaMercuryMonobromoacetic AcidNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HERNANDEZ, ERIK_OP2
Phone
907-581-1260
Email
[email protected]

Frequently asked questions about Unalaska Water

Is Unalaska Water tap water safe to drink?

EPA monitoring detected 17 contaminants in Unalaska Water'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 Unalaska Water's water?

EPA monitoring detected Copper, Lead, Bromodichloromethane, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does Unalaska Water serve?

Unalaska Water reports serving 9,400 people in Alaska, per its EPA record.

Has Unalaska Water had any water quality violations?

The EPA has 300 violations on file for Unalaska Water, of which 3 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.