Tap WaterIndex

← Alaska

Tap water quality report

Thorne Bay, AK

EPA monitoring detected 11 contaminants across the 1 water supplier serving Thorne Bay. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

1
water supplier
470
people served
11
contaminants found
Alaska rankings Lead in Alaska PFAS in Alaska

What was found in Thorne Bay's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Copper
1610 µg/L 124%
of the EPA limit, in the worst sample — 1300 µg/L
 1/1 SYR4
Total Haloacetic Acids (HAA5)
346.6 µg/L 578%
of the EPA limit, in the worst sample — 60 µg/L
 1/1 SYR4
Trichloroacetic Acid
270 µg/L
No EPA limit set
 1/1 SYR4
TTHM
255 µg/L 319%
of the EPA limit, in the worst sample — 80 µg/L
 1/1 SYR4
Chloroform
250 µg/L
No EPA limit set
 1/1 SYR4
Dichloroacetic Acid
71 µg/L
No EPA limit set
 1/1 SYR4
Lead
55.8 µg/L 372%
of the EPA limit, in the worst sample — 15 µg/L
 1/1 SYR4
Bromodichloromethane
6.09 µg/L
No EPA limit set
 1/1 SYR4
Monochloroacetic Acid
5.6 µg/L
No EPA limit set
 1/1 SYR4
Dibromochloromethane
0.8500 µg/L
No EPA limit set
 1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 1/1 LCR
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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Thorne Bay

SupplierPopulation served
THORNE BAY, CITY OF 470

Frequently asked questions about Thorne Bay tap water

Is Thorne Bay tap water safe to drink?

EPA testing detected 11 contaminants in the water serving Thorne Bay. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Thorne Bay?

1 public water supplier report drinking-water monitoring for Thorne Bay, Alaska to the EPA. Each is listed above with its population served.

What contaminants are in Thorne Bay's water?

The contaminants EPA monitoring detected in Thorne Bay include Copper, Total Haloacetic Acids (HAA5), Trichloroacetic Acid, TTHM, Chloroform. The full list, with the highest level found and the data source, is in the table above.

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.