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Tap water quality report

Westborough, MA

EPA monitoring detected 21 contaminants across the 1 water supplier serving Westborough. 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
21,567
people served
21
contaminants found
Massachusetts rankings Lead in Massachusetts PFAS in Massachusetts

What was found in Westborough'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
1500 µg/L 15%
of the EPA limit 10000 µg/L
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Fluoride
1140 µg/L 28%
of the EPA limit 4000 µg/L
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2018
1/1 SYR4
Copper
71.05 µg/L 5.5%
of the EPA limit 1300 µg/L
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2015
1/1 SYR4
TTHM
63.415 µg/L 79%
of the EPA limit 80 µg/L
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Barium
52.35 µg/L 2.6%
of the EPA limit 2000 µg/L
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2018
1/1 SYR4
Chloroform
38.85 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
22.045 µg/L 37%
of the EPA limit 60 µg/L
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Arsenic
21 µg/L 210%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Bromodichloromethane
17 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Dichloroacetic Acid
12 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Trichloroacetic Acid
9.72 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Dibromochloromethane
8.585 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Selenium
4.9 µg/L 9.8%
of the EPA limit 50 µg/L
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2018
1/1 SYR4
Monochloroacetic Acid
3.675 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Dibromoacetic Acid
2.395 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
Bromoform
1.59 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
cis-1,2-Dichloroethylene
0.5100 µg/L 0.7%
of the EPA limit 70 µg/L
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2019
1/1 SYR4
PFOS
0.0075 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2024
1/1 UCMR-5
PFOA
0.0058 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2024
1/1 UCMR-5
PFBS
0.0034 µg/L
No EPA limit set
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2024
1/1 UCMR-5
Lead
0.0018 mg/L 12%
of the EPA limit 0.0150 mg/L
Main supplier: WESTBOROUGH WATER DEPARTMENT · 21,567 people · 2026
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 Westborough

SupplierPopulation served
WESTBOROUGH WATER DEPARTMENT 21,567

Frequently asked questions about Westborough tap water

Is Westborough tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Westborough. 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 Westborough?

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

What contaminants are in Westborough's water?

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