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Tap water quality report

Koliganek, AK

EPA monitoring detected 7 contaminants across the 1 water supplier serving Koliganek. 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
170
people served
7
contaminants found
Alaska rankings Lead in Alaska PFAS in Alaska

What was found in Koliganek'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
1708 µg/L 131%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
Main supplier: KOLIGANEK WATER SYSTEM · 170 people · 2013
1/1 SYR4
Nitrate
377 µg/L 3.8%
of the EPA limit 10000 µg/L
Main supplier: KOLIGANEK WATER SYSTEM · 170 people · 2016
1/1 SYR4
Nitrate-Nitrite
345.2 µg/L 3.5%
of the EPA limit 10000 µg/L
Main supplier: KOLIGANEK WATER SYSTEM · 170 people · 2019
1/1 SYR4
Lead
5.964 µg/L 40%
of the EPA limit 15 µg/L
Main supplier: KOLIGANEK WATER SYSTEM · 170 people · 2013
1/1 SYR4
Barium
5.89 µg/L 0.3%
of the EPA limit 2000 µg/L
Main supplier: KOLIGANEK WATER SYSTEM · 170 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
3.8 pCi/L 76%
of the EPA limit 5 pCi/L
Main supplier: KOLIGANEK WATER SYSTEM · 170 people · 2017
1/1 SYR4
Lead
0.0058 mg/L 39%
of the EPA limit 0.0150 mg/L
Main supplier: KOLIGANEK WATER SYSTEM · 170 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 Koliganek

SupplierPopulation served
KOLIGANEK WATER SYSTEM 170

Frequently asked questions about Koliganek tap water

Is Koliganek tap water safe to drink?

EPA testing detected 7 contaminants in the water serving Koliganek. 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 Koliganek?

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

What contaminants are in Koliganek's water?

The contaminants EPA monitoring detected in Koliganek include Copper, Nitrate, Nitrate-Nitrite, Lead, Barium. 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.