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Tap water quality report

Dalton, MA

EPA monitoring detected 12 contaminants across the 1 water supplier serving Dalton. 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
6,330
people served
12
contaminants found
Massachusetts rankings Lead in Massachusetts PFAS in Massachusetts

What was found in Dalton'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
308 µg/L 3.1%
of the EPA limit 10000 µg/L
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2019
1/1 SYR4
TTHM
70.5 µg/L 88%
of the EPA limit 80 µg/L
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2019
1/1 SYR4
Chloroform
63 µg/L
No EPA limit set
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
47.1 µg/L 79%
of the EPA limit 60 µg/L
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2019
1/1 SYR4
Trichloroacetic Acid
31.5 µg/L
No EPA limit set
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2019
1/1 SYR4
Dichloroacetic Acid
17.5 µg/L
No EPA limit set
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2019
1/1 SYR4
Bromodichloromethane
4.21 µg/L
No EPA limit set
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2019
1/1 SYR4
Copper
3.9 µg/L 0.3%
of the EPA limit 1300 µg/L
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2015
1/1 SYR4
Gross Beta Particle Activity
3.4 pCi/L
No EPA limit set
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2015
1/1 SYR4
Monochloroacetic Acid
2.12 µg/L
No EPA limit set
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2019
1/1 SYR4
Monobromoacetic Acid
0.9295 µg/L
No EPA limit set
Main supplier: DALTON FIRE DISTRICT · 6,330 people · 2019
1/1 SYR4
Lead
0.0011 mg/L 7.3%
of the EPA limit 0.0150 mg/L
Main supplier: DALTON FIRE DISTRICT · 6,330 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 Dalton

SupplierPopulation served
DALTON FIRE DISTRICT 6,330

Frequently asked questions about Dalton tap water

Is Dalton tap water safe to drink?

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

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

What contaminants are in Dalton's water?

The contaminants EPA monitoring detected in Dalton include Nitrate, TTHM, Chloroform, Total Haloacetic Acids (HAA5), Trichloroacetic Acid. 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.