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Tap water quality report

Millis, MA

EPA monitoring detected 25 contaminants across the 1 water supplier serving Millis. 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
9,055
people served
25
contaminants found
Massachusetts rankings Lead in Massachusetts PFAS in Massachusetts

What was found in Millis'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
3218.5 µg/L 32%
of the EPA limit 10000 µg/L
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Fluoride
1330 µg/L 33%
of the EPA limit 4000 µg/L
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Copper
100 µg/L 7.7%
of the EPA limit 1300 µg/L
Main supplier: MILLIS WATER DEPT · 9,055 people · 2014
1/1 SYR4
Barium
41.44 µg/L 2.1%
of the EPA limit 2000 µg/L
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
TTHM
18.95 µg/L 24%
of the EPA limit 80 µg/L
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Bromoform
8.01 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Dibromochloromethane
7.09 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Trichloroethylene
6.8835 µg/L 138%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
6.5 µg/L 11%
of the EPA limit 60 µg/L
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Bromodichloromethane
5.434 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Chloroform
2.904 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Dibromoacetic Acid
2.8075 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Dichloroacetic Acid
2.348 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Trichloroacetic Acid
1.731 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Monochloroacetic Acid
1.68 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Tetrachloroethylene
1.12 µg/L 22%
of the EPA limit 5 µg/L
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
cis-1,2-Dichloroethylene
0.8430 µg/L 1.2%
of the EPA limit 70 µg/L
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
1,1-Dichloroethylene
0.7000 µg/L 10%
of the EPA limit 7 µg/L
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
Monobromoacetic Acid
0.5100 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2019
1/1 SYR4
PFBS
0.0091 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2024
1/1 UCMR-5
PFOS
0.0073 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2024
1/1 UCMR-5
PFOA
0.0069 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2024
1/1 UCMR-5
Pfhxa
0.0030 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2024
1/1 UCMR-5
Pfpea
0.0030 µg/L
No EPA limit set
Main supplier: MILLIS WATER DEPT · 9,055 people · 2024
1/1 UCMR-5
Lead
0.0015 mg/L 10%
of the EPA limit 0.0150 mg/L
Main supplier: MILLIS WATER DEPT · 9,055 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 Millis

SupplierPopulation served
MILLIS WATER DEPT 9,055

Frequently asked questions about Millis tap water

Is Millis tap water safe to drink?

EPA testing detected 25 contaminants in the water serving Millis. 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 Millis?

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

What contaminants are in Millis's water?

The contaminants EPA monitoring detected in Millis include Nitrate, Fluoride, Copper, Barium, TTHM. 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.