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Tap water quality report

Chefornak, AK

EPA monitoring detected 20 contaminants across the 1 water supplier serving Chefornak. 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
513
people served
20
contaminants found
Alaska rankings Lead in Alaska PFAS in Alaska

What was found in Chefornak'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
Nitrate-Nitrite
955 µg/L 9.6%
of the EPA limit 10000 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2019
1/1 SYR4
Nitrate
654 µg/L 6.5%
of the EPA limit 10000 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2017
1/1 SYR4
TTHM
454.62 µg/L 568%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2014
1/1 SYR4
Fluoride
310 µg/L 7.8%
of the EPA limit 4000 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2018
1/1 SYR4
Dibromochloromethane
184.815 µg/L
No EPA limit set
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2014
1/1 SYR4
Bromodichloromethane
129.15 µg/L
No EPA limit set
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2014
1/1 SYR4
Barium
121 µg/L 6.1%
of the EPA limit 2000 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2018
1/1 SYR4
Chloroform
94.54 µg/L
No EPA limit set
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2014
1/1 SYR4
Copper
85.15 µg/L 6.6%
of the EPA limit 1300 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2018
1/1 SYR4
Total Haloacetic Acids (HAA5)
68.94 µg/L 115%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2014
1/1 SYR4
Bromoform
66.556 µg/L
No EPA limit set
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2014
1/1 SYR4
Trichloroacetic Acid
52.6355 µg/L
No EPA limit set
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2014
1/1 SYR4
Lead
16.87 µg/L 112%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2018
1/1 SYR4
Dichloroacetic Acid
15.34 µg/L
No EPA limit set
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2014
1/1 SYR4
Dibromoacetic Acid
9.274 µg/L
No EPA limit set
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2014
1/1 SYR4
Combined Radium (-226 And -228)
4.8 pCi/L 96%
of the EPA limit 5 pCi/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2017
1/1 SYR4
Chromium
2.03 µg/L 2%
of the EPA limit 100 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2018
1/1 SYR4
Arsenic
1.99 µg/L 20%
of the EPA limit 10 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2015
1/1 SYR4
Toluene
0.8700 µg/L 0.1%
of the EPA limit 1000 µg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 people · 2019
1/1 SYR4
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: CHEFORNAK WATER SYSTEM · 513 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 Chefornak

SupplierPopulation served
CHEFORNAK WATER SYSTEM 513

Frequently asked questions about Chefornak tap water

Is Chefornak tap water safe to drink?

EPA testing detected 20 contaminants in the water serving Chefornak. 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 Chefornak?

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

What contaminants are in Chefornak's water?

The contaminants EPA monitoring detected in Chefornak include Nitrate-Nitrite, Nitrate, TTHM, Fluoride, Dibromochloromethane. 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.