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Tap water quality report

Saint Mary'S, AK

EPA monitoring detected 13 contaminants across the 1 water supplier serving Saint Mary'S. 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
548
people served
13
contaminants found
Alaska rankings Lead in Alaska PFAS in Alaska

What was found in Saint Mary'S'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
1995 µg/L 153%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2013
1/1 SYR4
Nitrate-Nitrite
332 µg/L 3.3%
of the EPA limit 10000 µg/L
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2019
1/1 SYR4
TTHM
34.275 µg/L 43%
of the EPA limit 80 µg/L
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2019
1/1 SYR4
Chloroform
30.4 µg/L
No EPA limit set
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
26.8 µg/L 45%
of the EPA limit 60 µg/L
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2019
1/1 SYR4
Trichloroacetic Acid
14 µg/L
No EPA limit set
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2019
1/1 SYR4
Barium
13.9 µg/L 0.7%
of the EPA limit 2000 µg/L
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2019
1/1 SYR4
Dichloroacetic Acid
12.9 µg/L
No EPA limit set
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2019
1/1 SYR4
Lead
5.274 µg/L 35%
of the EPA limit 15 µg/L
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2013
1/1 SYR4
Bromodichloromethane
4.029 µg/L
No EPA limit set
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2019
1/1 SYR4
Monochloroacetic Acid
2.2 µg/L
No EPA limit set
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2019
1/1 SYR4
Dibromochloromethane
0.8880 µg/L
No EPA limit set
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2019
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: ST. MARYS WATER SYSTEM · 548 people · 2023
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 Saint Mary'S

SupplierPopulation served
ST. MARYS WATER SYSTEM 548

Frequently asked questions about Saint Mary'S tap water

Is Saint Mary'S tap water safe to drink?

EPA testing detected 13 contaminants in the water serving Saint Mary'S. 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 Saint Mary'S?

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

What contaminants are in Saint Mary'S's water?

The contaminants EPA monitoring detected in Saint Mary'S include Copper, Nitrate-Nitrite, 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.