Is Dillingham, AK Tap Water Safe? Quality & Contaminants

What was found in Dillingham'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.

Contaminant	Level vs EPA limit	Suppliers	Source
Copper	486.9 µg/L 37% of the EPA limit 1300 µg/L Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2018 Highest in the city: 1800 µg/L — SALMON ROE · 31 people · 2019	4/4	SYR4
Nitrate-Nitrite	986 µg/L 9.9% of the EPA limit 10000 µg/L Highest in the city: SALMON ROE · 31 people · 2018	2/4	SYR4
Nitrate	940 µg/L 9.4% of the EPA limit 10000 µg/L Highest in the city: SALMON ROE · 31 people · 2017	1/4	SYR4
Lead	7.58 µg/L 51% of the EPA limit 15 µg/L Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2018 Highest in the city: 40 µg/L — SALMON ROE · 31 people · 2019	4/4	SYR4
Barium	16.8 µg/L 0.8% of the EPA limit 2000 µg/L Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2019	1/4	SYR4
TTHM	2.9 µg/L 3.6% of the EPA limit 80 µg/L Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2019 Highest in the city: 11 µg/L — BBAHC - KANAKANAK HOSPITAL · 305 people · 2019	2/4	SYR4
Xylenes, Total	8.274 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2019	1/4	SYR4
Chloroform	2.9 µg/L No EPA limit set Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2019 Highest in the city: 7.096 µg/L — BBAHC - KANAKANAK HOSPITAL · 305 people · 2019	2/4	SYR4
Total Haloacetic Acids (HAA5)	3.685 µg/L 6.1% of the EPA limit 60 µg/L Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2019 Highest in the city: 5.492 µg/L — BBAHC - KANAKANAK HOSPITAL · 305 people · 2019	2/4	SYR4
Gross Beta Particle Activity	4.9 pCi/L No EPA limit set Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2015	1/4	SYR4
Dichloroacetic Acid	3.685 µg/L No EPA limit set Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2019	2/4	SYR4
Bromodichloromethane	2.996 µg/L No EPA limit set Highest in the city: BBAHC - KANAKANAK HOSPITAL · 305 people · 2019	1/4	SYR4
Trichloroacetic Acid	2.12 µg/L No EPA limit set Highest in the city: BBAHC - KANAKANAK HOSPITAL · 305 people · 2019	1/4	SYR4
Ethylbenzene	1.48 µg/L 0.2% of the EPA limit 700 µg/L Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2019	1/4	SYR4
Arsenic	1.1 µg/L 11% of the EPA limit 10 µg/L Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2013	1/4	SYR4
Dibromochloromethane	0.8000 µg/L No EPA limit set Highest in the city: BBAHC - KANAKANAK HOSPITAL · 305 people · 2019	1/4	SYR4
Lead	0.00040 mg/L 2.7% of the EPA limit 0.0150 mg/L Main supplier: DILLINGHAM WATER SYSTEM · 2,419 people · 2027 Highest in the city: 0.0110 mg/L — BBAHC - KANAKANAK HOSPITAL · 305 people · 2025	4/4	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 Dillingham

Supplier	Population served
DILLINGHAM WATER SYSTEM	2,419
BBAHC - KANAKANAK HOSPITAL	305
SALMON ROE	31
NINA NICHOLSON SUBDIVISION	31

Frequently asked questions about Dillingham tap water

Is Dillingham tap water safe to drink?

EPA testing detected 17 contaminants in the water serving Dillingham. 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 Dillingham?

4 public water suppliers report drinking-water monitoring for Dillingham, Alaska to the EPA. Each is listed above with its population served.

What contaminants are in Dillingham's water?

The contaminants EPA monitoring detected in Dillingham include Copper, Nitrate-Nitrite, Nitrate, 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.