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Tap water quality report

Gray, ME

EPA monitoring detected 12 contaminants across the 1 water supplier serving Gray. 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
2,468
people served
12
contaminants found
Maine rankings Lead in Maine PFAS in Maine

What was found in Gray'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
3370 µg/L 34%
of the EPA limit 10000 µg/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2019
1/1 SYR4
Nitrate-Nitrite
3255 µg/L 33%
of the EPA limit 10000 µg/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2017
1/1 SYR4
Copper
766 µg/L 59%
of the EPA limit 1300 µg/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2019
1/1 SYR4
Fluoride
100 µg/L 2.5%
of the EPA limit 4000 µg/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2017
1/1 SYR4
Combined Uranium
12.6 µg/L 42%
of the EPA limit 30 µg/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2019
1/1 SYR4
Gross Alpha, Excl. Radon And U
7.12 pCi/L 47%
of the EPA limit 15 pCi/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2019
1/1 SYR4
Lead
6.075 µg/L 41%
of the EPA limit 15 µg/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2019
1/1 SYR4
Arsenic
4.99 µg/L 50%
of the EPA limit 10 µg/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2017
1/1 SYR4
Barium
3.87 µg/L 0.2%
of the EPA limit 2000 µg/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2017
1/1 SYR4
Combined Radium (-226 And -228)
2.5195 pCi/L 50%
of the EPA limit 5 pCi/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2019
1/1 SYR4
Chromium
1.37 µg/L 1.4%
of the EPA limit 100 µg/L
Main supplier: GRAY WATER DISTRICT · 2,468 people · 2017
1/1 SYR4
Lead
0.0023 mg/L 15%
of the EPA limit 0.0150 mg/L
Main supplier: GRAY WATER DISTRICT · 2,468 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 Gray

SupplierPopulation served
GRAY WATER DISTRICT 2,468

Frequently asked questions about Gray tap water

Is Gray tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Gray. 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 Gray?

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

What contaminants are in Gray's water?

The contaminants EPA monitoring detected in Gray include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Combined Uranium. 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.