Tap WaterIndex

← Massachusetts

Tap water quality report

Wareham, MA

EPA monitoring detected 16 contaminants across the 2 water suppliers serving Wareham. 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.

2
water suppliers
25,494
people served
16
contaminants found
Massachusetts rankings Lead in Massachusetts PFAS in Massachusetts

What was found in Wareham'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
510 µg/L 5.1%
of the EPA limit 10000 µg/L
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
2/2 SYR4
Copper
58.5 µg/L 4.5%
of the EPA limit 1300 µg/L
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
Highest in the city: 130 µg/L — ONSET FIRE DISTRICTWATER DEPT. · 5,392 people · 2013
2/2 SYR4
TTHM
18.63 µg/L 23%
of the EPA limit 80 µg/L
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
1/2 SYR4
Barium
16 µg/L 0.8%
of the EPA limit 2000 µg/L
Highest in the city: ONSET FIRE DISTRICTWATER DEPT. · 5,392 people · 2018
1/2 SYR4
Chloroform
8.04 µg/L
No EPA limit set
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
1/2 SYR4
Bromodichloromethane
6.27 µg/L
No EPA limit set
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
1/2 SYR4
Dibromochloromethane
4.565 µg/L
No EPA limit set
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
1/2 SYR4
Antimony, Total
3 µg/L 50%
of the EPA limit 6 µg/L
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2018
Highest in the city: 4 µg/L — ONSET FIRE DISTRICTWATER DEPT. · 5,392 people · 2018
2/2 SYR4
Total Haloacetic Acids (HAA5)
3.38 µg/L 5.6%
of the EPA limit 60 µg/L
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
1/2 SYR4
Dichloroacetic Acid
2.9 µg/L
No EPA limit set
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
1/2 SYR4
Trichloroacetic Acid
2.225 µg/L
No EPA limit set
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
1/2 SYR4
Bromoform
1.87 µg/L
No EPA limit set
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
1/2 SYR4
Tetrachloroethylene
0.7900 µg/L 16%
of the EPA limit 5 µg/L
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
Highest in the city: 1.58 µg/L — ONSET FIRE DISTRICTWATER DEPT. · 5,392 people · 2019
2/2 SYR4
Dibromoacetic Acid
1.095 µg/L
No EPA limit set
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2019
1/2 SYR4
PFOS
0.0071 µg/L
No EPA limit set
Highest in the city: ONSET FIRE DISTRICTWATER DEPT. · 5,392 people · 2025
1/2 UCMR-5
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
Main supplier: WAREHAM FIRE DISTRICT · 20,102 people · 2025
Highest in the city: 0.0030 mg/L — ONSET FIRE DISTRICTWATER DEPT. · 5,392 people · 2023
2/2 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 Wareham

SupplierPopulation served
WAREHAM FIRE DISTRICT 20,102
ONSET FIRE DISTRICTWATER DEPT. 5,392

Frequently asked questions about Wareham tap water

Is Wareham tap water safe to drink?

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

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

What contaminants are in Wareham's water?

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