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Tap water quality report

Oak Bluffs, MA

EPA monitoring detected 15 contaminants across the 1 water supplier serving Oak Bluffs. 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
24,000
people served
15
contaminants found
Massachusetts rankings Lead in Massachusetts PFAS in Massachusetts

What was found in Oak Bluffs'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
2053 µg/L 21%
of the EPA limit 10000 µg/L
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2019
1/1 SYR4
Fluoride
985.5 µg/L 25%
of the EPA limit 4000 µg/L
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2018
1/1 SYR4
Copper
51 µg/L 3.9%
of the EPA limit 1300 µg/L
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2019
1/1 SYR4
Barium
35.9 µg/L 1.8%
of the EPA limit 2000 µg/L
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2018
1/1 SYR4
TTHM
7.399 µg/L 9.2%
of the EPA limit 80 µg/L
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2019
1/1 SYR4
Bromoform
2.509 µg/L
No EPA limit set
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2019
1/1 SYR4
Dibromochloromethane
2.484 µg/L
No EPA limit set
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2019
1/1 SYR4
Chloroform
1.9325 µg/L
No EPA limit set
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
1.543 µg/L 2.6%
of the EPA limit 60 µg/L
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2019
1/1 SYR4
Bromodichloromethane
1.48 µg/L
No EPA limit set
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2019
1/1 SYR4
Tetrachloroethylene
1.065 µg/L 21%
of the EPA limit 5 µg/L
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2019
1/1 SYR4
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2018
1/1 SYR4
Pfhxa
0.0040 µg/L
No EPA limit set
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2023
1/1 UCMR-5
Pfpea
0.0040 µg/L
No EPA limit set
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2023
1/1 UCMR-5
Lead
0.0039 mg/L 26%
of the EPA limit 0.0150 mg/L
Main supplier: OAK BLUFFS WATER DISTRICT · 24,000 people · 2023
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 Oak Bluffs

SupplierPopulation served
OAK BLUFFS WATER DISTRICT 24,000

Frequently asked questions about Oak Bluffs tap water

Is Oak Bluffs tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Oak Bluffs. 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 Oak Bluffs?

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

What contaminants are in Oak Bluffs's water?

The contaminants EPA monitoring detected in Oak Bluffs 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.