Tap WaterIndex

← Massachusetts

Tap water quality report

Hamilton Water Dept

EPA monitoring tested this supplier for 92 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

92
contaminants tested
12
detected
7,674
people served
15
health-based violations
Massachusetts rankingsLead in MassachusettsPFAS in Massachusetts
Water source
Ground water
Ownership
Local government
Counties served
Essex

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.

15
health-based violations
70
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2011-11-01 → 2011-11-30
MCL Health-based Resolved 2011-11-01 → 2011-11-30
MCL Health-based Resolved 2009-07-01 → 2009-07-31
MCL Health-based Resolved 2009-07-01 → 2009-07-31
MCL Health-based Archived 2000-06-01 → 2000-06-30
MCL Health-based Archived 1999-10-01 → 1999-10-31
MCL Health-based Archived 1999-02-01 → 1999-02-28
MCL Health-based Archived 1998-09-01 → 1998-09-30
MCL Health-based Archived 1997-02-01 → 1997-02-28

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0064 µg/L 4/4 2023
PFOS 0.0112 µg/L 3/4 2023
PFOA 0.0111 µg/L 2/4 2023
Pfhxa 0.0032 µg/L 1/4 2023
Pfpea 0.0030 µg/L 1/4 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
7014.5 µg/L 70%
of the EPA limit 10000 µg/L
worst single sample: 8600 µg/L
70/70 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
55 µg/L 92%
of the EPA limit 60 µg/L
worst single sample: 76 µg/L
61/72 SYR4 2012–2019
TTHM
82.6 µg/L 103%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 120 µg/L
59/59 SYR4 2012–2019
Lead
0.0027 mg/L 18%
of the EPA limit 0.0150 mg/L
 29/29 LCR 2025
Tetrachloroethylene
1.49 µg/L 30%
of the EPA limit 5 µg/L
worst single sample: 2.3 µg/L
19/70 SYR4 2012–2019
Barium
130 µg/L 6.5%
of the EPA limit 2000 µg/L
worst single sample: 140 µg/L
6/6 SYR4 2012–2018
Fluoride
1180 µg/L 30%
of the EPA limit 4000 µg/L
worst single sample: 1200 µg/L
5/6 SYR4 2012–2018
80 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, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
TIMOTHY J OLSON
Phone
9786265226
Email
[email protected]

Frequently asked questions about Hamilton Water Dept

Is Hamilton Water Dept tap water safe to drink?

EPA monitoring detected 12 contaminants in Hamilton Water 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 Hamilton Water Dept's water?

EPA monitoring detected Nitrate, Total Haloacetic Acids (HAA5), TTHM, Lead, Tetrachloroethylene, and others. The full list with the level and data source for each is above.

How many people does Hamilton Water Dept serve?

Hamilton Water Dept reports serving 7,674 people in Massachusetts, per its EPA record.

Has Hamilton Water Dept had any water quality violations?

The EPA has 70 violations on file for Hamilton Water Dept, of which 15 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.