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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 level at the main supplier 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 level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Copper
716 µg/L 55%
of the EPA limit 1300 µg/L
Main supplier: THORNE BAY, CITY OF · 470 people · 2018
1/1 SYR4
Total Haloacetic Acids (HAA5)
264 µg/L 440%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
Main supplier: THORNE BAY, CITY OF · 470 people · 2019
1/1 SYR4
Trichloroacetic Acid
250 µg/L
No EPA limit set
Main supplier: THORNE BAY, CITY OF · 470 people · 2019
1/1 SYR4
TTHM
249.65 µg/L 312%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: THORNE BAY, CITY OF · 470 people · 2019
1/1 SYR4
Chloroform
245.3 µg/L
No EPA limit set
Main supplier: THORNE BAY, CITY OF · 470 people · 2019
1/1 SYR4
Dichloroacetic Acid
47.95 µg/L
No EPA limit set
Main supplier: THORNE BAY, CITY OF · 470 people · 2019
1/1 SYR4
Lead
11.5 µg/L 77%
of the EPA limit 15 µg/L
Main supplier: THORNE BAY, CITY OF · 470 people · 2018
1/1 SYR4
Monochloroacetic Acid
5.39 µg/L
No EPA limit set
Main supplier: THORNE BAY, CITY OF · 470 people · 2019
1/1 SYR4
Bromodichloromethane
5.3675 µg/L
No EPA limit set
Main supplier: THORNE BAY, CITY OF · 470 people · 2019
1/1 SYR4
Dibromochloromethane
0.8500 µg/L
No EPA limit set
Main supplier: THORNE BAY, CITY OF · 470 people · 2019
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: THORNE BAY, CITY OF · 470 people · 2024
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 95th percentile of the system's samples — 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 level at the main supplier 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.