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Tap water quality report

Lewiston, ME

EPA monitoring detected 15 contaminants across the 2 water suppliers serving Lewiston. 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.

2
water suppliers
23,793
people served
15
contaminants found
Maine rankings Lead in Maine PFAS in Maine

What was found in Lewiston'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
Fluoride
800 µg/L 20%
of the EPA limit 4000 µg/L
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2019
2/2 SYR4
Copper
253 µg/L 19%
of the EPA limit 1300 µg/L
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2019
2/2 SYR4
Nitrate
60 µg/L 0.6%
of the EPA limit 10000 µg/L
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2019
1/2 SYR4
Nitrate-Nitrite
60 µg/L 0.6%
of the EPA limit 10000 µg/L
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2019
1/2 SYR4
Chloroform
58.1 µg/L
No EPA limit set
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2014
1/2 SYR4
TTHM
56.9 µg/L 71%
of the EPA limit 80 µg/L
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
44 µg/L 73%
of the EPA limit 60 µg/L
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2019
1/2 SYR4
Lead
28.98 µg/L 193%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2019
2/2 SYR4
Dichloroacetic Acid
25.75 µg/L
No EPA limit set
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2014
1/2 SYR4
Trichloroacetic Acid
25.7 µg/L
No EPA limit set
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2014
1/2 SYR4
Arsenic
0.6710 µg/L 6.7%
of the EPA limit 10 µg/L
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2019
Highest in the city: 8.4 µg/L — SUNSET GARDENS TRAILER PARK INC · 73 people · 2018
2/2 SYR4
Bromodichloromethane
4.8 µg/L
No EPA limit set
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2014
1/2 SYR4
Barium
1.465 µg/L 0.1%
of the EPA limit 2000 µg/L
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2019
Highest in the city: 2.09 µg/L — SUNSET GARDENS TRAILER PARK INC · 73 people · 2018
2/2 SYR4
Chromium
1.1 µg/L 1.1%
of the EPA limit 100 µg/L
Highest in the city: SUNSET GARDENS TRAILER PARK INC · 73 people · 2018
1/2 SYR4
Lead
0.0023 mg/L 15%
of the EPA limit 0.0150 mg/L
Main supplier: LEWISTON WATER & SEWER DIVISION · 23,720 people · 2023
2/2 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 Lewiston

SupplierPopulation served
LEWISTON WATER & SEWER DIVISION 23,720
SUNSET GARDENS TRAILER PARK INC 73

Frequently asked questions about Lewiston tap water

Is Lewiston tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Lewiston. 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 Lewiston?

2 public water suppliers report drinking-water monitoring for Lewiston, Maine to the EPA. Each is listed above with its population served.

What contaminants are in Lewiston's water?

The contaminants EPA monitoring detected in Lewiston include Fluoride, Copper, Nitrate, Nitrate-Nitrite, Chloroform. 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.