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Tap water quality report

Littleton, MA

EPA monitoring detected 16 contaminants across the 1 water supplier serving Littleton. 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
9,307
people served
16
contaminants found
Massachusetts rankings Lead in Massachusetts PFAS in Massachusetts

What was found in Littleton'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
1200 µg/L 12%
of the EPA limit 10000 µg/L
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Barium
82.6 µg/L 4.1%
of the EPA limit 2000 µg/L
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2018
1/1 SYR4
Copper
33.85 µg/L 2.6%
of the EPA limit 1300 µg/L
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2018
1/1 SYR4
TTHM
25.6 µg/L 32%
of the EPA limit 80 µg/L
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Dibromochloromethane
10.626 µg/L
No EPA limit set
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Arsenic
10.25 µg/L 102%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Bromodichloromethane
6.832 µg/L
No EPA limit set
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Bromoform
4.639 µg/L
No EPA limit set
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Chloroform
3.474 µg/L
No EPA limit set
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
2.058 µg/L 3.4%
of the EPA limit 60 µg/L
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Monobromoacetic Acid
1.41 µg/L
No EPA limit set
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Dichloroacetic Acid
1.07 µg/L
No EPA limit set
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.0695 µg/L
No EPA limit set
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Bromate
1 µg/L 10%
of the EPA limit 10 µg/L
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Tetrachloroethylene
0.9400 µg/L 19%
of the EPA limit 5 µg/L
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 people · 2019
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: LITTLETON WATER DEPARTMENT · 9,307 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 Littleton

SupplierPopulation served
LITTLETON WATER DEPARTMENT 9,307

Frequently asked questions about Littleton tap water

Is Littleton tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Littleton. 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 Littleton?

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

What contaminants are in Littleton's water?

The contaminants EPA monitoring detected in Littleton include Nitrate, Barium, Copper, TTHM, Dibromochloromethane. 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.