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Tap water quality report

Mashpee Water District

EPA monitoring tested this supplier for 91 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

91
contaminants tested
8
detected
36,922
people served
3
health-based violations
Massachusetts rankingsLead in MassachusettsPFAS in Massachusetts
Water source
Ground water
Ownership
Local government
Counties served
Barnstable

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.

3
health-based violations
6
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1997-06-01 → 1997-06-30
MCL Health-based Resolved 1996-08-01 → 1996-08-31
MCL Health-based Resolved 1994-10-01 → 1994-10-31
MR Monitoring Resolved 1993-07-01
MR Monitoring Resolved 1993-07-01
MR Monitoring Archived 1992-06-01 → 1992-06-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0080 µg/L 1/12 2024

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
1901 µg/L 19%
of the EPA limit 10000 µg/L
worst single sample: 2540 µg/L
110/110 SYR4 2012–2019
Tetrachloroethylene
1.379 µg/L 28%
of the EPA limit 5 µg/L
worst single sample: 2.3 µg/L
35/156 SYR4 2012–2019
Barium
63.5 µg/L 3.2%
of the EPA limit 2000 µg/L
worst single sample: 140 µg/L
16/19 SYR4 2012–2018
Lead
0.0014 mg/L 9.3%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2024
Fluoride
760 µg/L 19%
of the EPA limit 4000 µg/L
 1/19 SYR4 2012–2018
Nitrite
54 µg/L 5.4%
of the EPA limit 1000 µg/L
 1/15 SYR4 2012–2017
Thallium, Total
1 µg/L 50%
of the EPA limit 2 µg/L
 1/19 SYR4 2012–2018
83 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, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MICHAEL B FREDERICKS
Phone
5084776767
Email
[email protected]

Frequently asked questions about Mashpee Water District

Is Mashpee Water District tap water safe to drink?

EPA monitoring detected 8 contaminants in Mashpee 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 Mashpee Water District's water?

EPA monitoring detected Nitrate, Tetrachloroethylene, Barium, Lead, Fluoride, and others. The full list with the level and data source for each is above.

How many people does Mashpee Water District serve?

Mashpee Water District reports serving 36,922 people in Massachusetts, per its EPA record.

Has Mashpee Water District had any water quality violations?

The EPA has 6 violations on file for Mashpee Water District, of which 3 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.