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Tap water quality report

Onset Fire Districtwater Dept.

EPA monitoring tested this supplier for 92 contaminants and detected 7. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

92
contaminants tested
7
detected
5,392
people served
16
health-based violations
Massachusetts rankingsLead in MassachusettsPFAS in Massachusetts
Water source
Ground water
Ownership
Local government
Counties served
Plymouth

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.

16
health-based violations
59
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2019-05-01 → 2019-05-31
MCL Health-based Resolved 2013-11-01 → 2013-11-30
MCL Health-based Resolved 2013-11-01 → 2013-11-30
MCL Health-based Resolved 2013-01-01 → 2013-01-31
MCL Health-based Resolved 2013-01-01 → 2013-01-31
MCL Health-based Resolved 2012-12-01 → 2012-12-31
MCL Health-based Resolved 2012-12-01 → 2012-12-31
MCL Health-based Resolved 2012-11-01 → 2012-11-30
MCL Health-based Resolved 2012-11-01 → 2012-11-30
MCL Health-based Resolved 2012-02-01 → 2012-02-29

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFOS 0.0071 µg/L 1/4 2025

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
490 µg/L 4.9%
of the EPA limit 10000 µg/L
worst single sample: 500 µg/L
58/64 SYR4 2012–2019
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
 16/16 LCR 2023
Tetrachloroethylene
1.58 µg/L 32%
of the EPA limit 5 µg/L
worst single sample: 1.7 µg/L
7/62 SYR4 2012–2019
Antimony, Total
4 µg/L 67%
of the EPA limit 6 µg/L
 1/3 SYR4 2012–2018
Barium
16 µg/L 0.8%
of the EPA limit 2000 µg/L
 1/3 SYR4 2012–2018
Copper
130 µg/L 10%
of the EPA limit 1300 µg/L
 1/4 SYR4 2013
85 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-PF3ONSAdonaArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneFluorideHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DAVID R CANDEIAS
Phone
5082950603
Email
[email protected]

Frequently asked questions about Onset Fire Districtwater Dept.

Is Onset Fire Districtwater Dept. tap water safe to drink?

EPA monitoring detected 7 contaminants in Onset Fire Districtwater Dept.'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 Onset Fire Districtwater Dept.'s water?

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

How many people does Onset Fire Districtwater Dept. serve?

Onset Fire Districtwater Dept. reports serving 5,392 people in Massachusetts, per its EPA record.

Has Onset Fire Districtwater Dept. had any water quality violations?

The EPA has 59 violations on file for Onset Fire Districtwater Dept., of which 16 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.