Tap WaterIndex

← Massachusetts

Tap water quality report

Oak Bluffs Water District

EPA monitoring tested this supplier for 102 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

102
contaminants tested
15
detected
24,000
people served
29
health-based violations
Massachusetts rankingsLead in MassachusettsPFAS in Massachusetts
Water source
Ground water
Ownership
Local government
Counties served
Dukes

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

29
health-based violations
149
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2013-06-01 → 2013-06-30
MCL Health-based Resolved 2013-06-01 → 2013-06-30
MCL Health-based Resolved 2013-05-01 → 2013-05-31
MCL Health-based Resolved 2013-05-01 → 2013-05-31
MCL Health-based Resolved 2012-11-01 → 2012-11-30
MCL Health-based Resolved 2012-11-01 → 2012-11-30
MCL Health-based Resolved 2010-04-01 → 2010-04-30
MCL Health-based Resolved 2010-04-01 → 2010-04-30
MCL Health-based Resolved 2009-12-01 → 2009-12-31
MCL Health-based Resolved 2009-12-01 → 2009-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfhxa 0.0040 µg/L 2/10 2023
Pfpea 0.0040 µg/L 2/10 2023

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
2053 µg/L 21%
of the EPA limit 10000 µg/L
worst single sample: 2360 µg/L
80/80 SYR4 2012–2019
TTHM
7.399 µg/L 9.2%
of the EPA limit 80 µg/L
worst single sample: 9.75 µg/L
47/48 SYR4 2014–2019
Tetrachloroethylene
1.065 µg/L 21%
of the EPA limit 5 µg/L
worst single sample: 1.9 µg/L
46/254 SYR4 2012–2019
Chloroform
1.9325 µg/L
No EPA limit set
worst single sample: 1.96 µg/L
24/24 SYR4 2015–2019
Copper
51 µg/L 3.9%
of the EPA limit 1300 µg/L
worst single sample: 71 µg/L
17/38 SYR4 2013–2019
Dibromochloromethane
2.484 µg/L
No EPA limit set
worst single sample: 2.52 µg/L
13/24 SYR4 2015–2019
Lead
0.0039 mg/L 26%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2023
Bromodichloromethane
1.48 µg/L
No EPA limit set
worst single sample: 1.49 µg/L
11/24 SYR4 2015–2019
Bromoform
2.509 µg/L
No EPA limit set
worst single sample: 2.95 µg/L
10/24 SYR4 2015–2019
Barium
35.9 µg/L 1.8%
of the EPA limit 2000 µg/L
worst single sample: 38 µg/L
8/9 SYR4 2012–2018
Fluoride
985.5 µg/L 25%
of the EPA limit 4000 µg/L
worst single sample: 1010 µg/L
8/9 SYR4 2012–2018
Total Haloacetic Acids (HAA5)
1.543 µg/L 2.6%
of the EPA limit 60 µg/L
worst single sample: 1.56 µg/L
2/54 SYR4 2014–2019
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
 1/9 SYR4 2012–2018
87 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDichloroacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTolueneToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MICHAEL G SILVIA
Phone
5086935527
Email
[email protected]

Frequently asked questions about Oak Bluffs Water District

Is Oak Bluffs Water District tap water safe to drink?

EPA monitoring detected 15 contaminants in Oak Bluffs Water District's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Oak Bluffs Water District's water?

EPA monitoring detected Nitrate, TTHM, Tetrachloroethylene, Chloroform, Copper, and others. The full list with the level and data source for each is above.

How many people does Oak Bluffs Water District serve?

Oak Bluffs Water District reports serving 24,000 people in Massachusetts, per its EPA record.

Has Oak Bluffs Water District had any water quality violations?

The EPA has 149 violations on file for Oak Bluffs Water District, of which 29 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.