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Tap water quality report

Groton, MA

EPA monitoring detected 15 contaminants across the 4 water suppliers serving Groton. 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.

4
water suppliers
7,411
people served
15
contaminants found
Massachusetts rankings Lead in Massachusetts PFAS in Massachusetts

What was found in Groton'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
990 µg/L 9.9%
of the EPA limit 10000 µg/L
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2019
3/4 SYR4
Copper
110 µg/L 8.5%
of the EPA limit 1300 µg/L
Highest in the city: WEST GROTON WATER SUPPLY DISTRICT · 1,853 people · 2019
2/4 SYR4
TTHM
24.805 µg/L 31%
of the EPA limit 80 µg/L
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2019
2/4 SYR4
Chloroform
18.7 µg/L
No EPA limit set
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2019
1/4 SYR4
Barium
10.4 µg/L 0.5%
of the EPA limit 2000 µg/L
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2018
3/4 SYR4
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2018
Highest in the city: 6 µg/L — STILL MEADOW VILLAGE CONDOMINIUMS · 50 people · 2018
3/4 SYR4
Bromodichloromethane
5.2735 µg/L
No EPA limit set
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2019
1/4 SYR4
Total Haloacetic Acids (HAA5)
4.808 µg/L 8%
of the EPA limit 60 µg/L
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2019
2/4 SYR4
Dibromochloromethane
4.368 µg/L
No EPA limit set
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2019
2/4 SYR4
Trichloroacetic Acid
3.3195 µg/L
No EPA limit set
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2019
1/4 SYR4
Dichloroacetic Acid
1.5705 µg/L
No EPA limit set
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2019
1/4 SYR4
Monobromoacetic Acid
1.14 µg/L
No EPA limit set
Highest in the city: WEST GROTON WATER SUPPLY DISTRICT · 1,853 people · 2019
1/4 SYR4
Bromoform
1.0265 µg/L
No EPA limit set
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2019
2/4 SYR4
Lead
0.0047 mg/L 31%
of the EPA limit 0.0150 mg/L
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2025
4/4 LCR
PFBS
0.0030 µg/L
No EPA limit set
Main supplier: GROTON WATER DEPARTMENT · 5,456 people · 2024
1/4 UCMR-5
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 Groton

SupplierPopulation served
GROTON WATER DEPARTMENT 5,456
WEST GROTON WATER SUPPLY DISTRICT 1,853
THE VILLAGE AT SHEPLEY HILL 52
STILL MEADOW VILLAGE CONDOMINIUMS 50

Frequently asked questions about Groton tap water

Is Groton tap water safe to drink?

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

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

What contaminants are in Groton's water?

The contaminants EPA monitoring detected in Groton include Nitrate, Copper, TTHM, Chloroform, 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.