Tap WaterIndex

← Alaska

Tap water quality report

Tyonek, AK

EPA monitoring detected 15 contaminants across the 1 water supplier serving Tyonek. 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
206
people served
15
contaminants found
Alaska rankings Lead in Alaska PFAS in Alaska

What was found in Tyonek'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
1055 µg/L 81%
of the EPA limit 1300 µg/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2018
1/1 SYR4
Fluoride
180 µg/L 4.5%
of the EPA limit 4000 µg/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2012
1/1 SYR4
TTHM
23.325 µg/L 29%
of the EPA limit 80 µg/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2019
1/1 SYR4
Chloroform
20.455 µg/L
No EPA limit set
Main supplier: TYONEK WATER SYSTEM · 206 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
17.44 µg/L 29%
of the EPA limit 60 µg/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2019
1/1 SYR4
Barium
14.4 µg/L 0.7%
of the EPA limit 2000 µg/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2012
1/1 SYR4
Lead
13.525 µg/L 90%
of the EPA limit 15 µg/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2018
1/1 SYR4
Trichloroacetic Acid
10.86 µg/L
No EPA limit set
Main supplier: TYONEK WATER SYSTEM · 206 people · 2019
1/1 SYR4
Dichloroacetic Acid
6.3495 µg/L
No EPA limit set
Main supplier: TYONEK WATER SYSTEM · 206 people · 2019
1/1 SYR4
Bromodichloromethane
2.893 µg/L
No EPA limit set
Main supplier: TYONEK WATER SYSTEM · 206 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
0.7900 pCi/L 16%
of the EPA limit 5 pCi/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2013
1/1 SYR4
Xylenes, Total
0.7000 µg/L 0%
of the EPA limit 10000 µg/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2019
1/1 SYR4
Arsenic
0.6171 µg/L 6.2%
of the EPA limit 10 µg/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2017
1/1 SYR4
Chromium
0.6140 µg/L 0.6%
of the EPA limit 100 µg/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2012
1/1 SYR4
Lead
0.0049 mg/L 33%
of the EPA limit 0.0150 mg/L
Main supplier: TYONEK WATER SYSTEM · 206 people · 2025
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 Tyonek

SupplierPopulation served
TYONEK WATER SYSTEM 206

Frequently asked questions about Tyonek tap water

Is Tyonek tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Tyonek. 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 Tyonek?

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

What contaminants are in Tyonek's water?

The contaminants EPA monitoring detected in Tyonek include Copper, Fluoride, TTHM, Chloroform, Total Haloacetic Acids (HAA5). 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.