Is Acton Water Supply District Tap Water Safe? Quality Report

Water source: Ground water under surface influence
Ownership: Local government
Counties served: Middlesex

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.

health-based violations

113

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2014-12-01 → 2014-12-31
MCL	Health-based	Resolved	2014-12-01 → 2014-12-31
MCL	Health-based	Resolved	2014-10-01 → 2014-10-31
MCL	Health-based	Resolved	2014-10-01 → 2014-10-31
MCL	Health-based	Resolved	2014-07-01 → 2014-07-31
MCL	Health-based	Resolved	2014-07-01 → 2014-07-31
MCL	Health-based	Resolved	2013-11-01 → 2013-11-30
MCL	Health-based	Resolved	2013-11-01 → 2013-11-30
MCL	Health-based	Resolved	2012-09-01 → 2012-09-30
MCL	Health-based	Resolved	2012-09-01 → 2012-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
PFOA	0.0134 µg/L	10/10	2024
Pfhxa	0.0071 µg/L	9/10	2024
Pfpea	0.0084 µg/L	8/10	2024
PFOS	0.0049 µg/L	6/10	2024
PFBS	0.0037 µg/L	5/10	2024
Pfba	0.0206 µg/L	4/10	2024
Pfhpa	0.0052 µg/L	4/10	2024
PFHXS	0.0032 µg/L	1/10	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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	4660 µg/L 47% of the EPA limit 10000 µg/L worst single sample: 6300 µg/L	188/200	SYR4	2012–2019
Bromodichloromethane	19.505 µg/L No EPA limit set worst single sample: 28 µg/L	112/112	SYR4	2012–2019
Dibromochloromethane	11.78 µg/L No EPA limit set worst single sample: 15.2 µg/L	112/112	SYR4	2012–2019
TTHM	82.345 µg/L 103% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 105 µg/L	112/112	SYR4	2012–2019
Chloroform	56.6 µg/L No EPA limit set worst single sample: 78.2 µg/L	109/112	SYR4	2012–2019
Bromoform	4.08 µg/L No EPA limit set worst single sample: 11.2 µg/L	93/112	SYR4	2012–2019
Copper	126.75 µg/L 9.8% of the EPA limit 1300 µg/L worst single sample: 8100 µg/L	86/125	SYR4	2012–2019
Arsenic	31 µg/L 310% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 96 µg/L	85/114	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	12.655 µg/L 21% of the EPA limit 60 µg/L worst single sample: 24.8 µg/L	74/112	SYR4	2012–2019
Trichloroacetic Acid	9.66 µg/L No EPA limit set worst single sample: 16.2 µg/L	56/112	SYR4	2012–2019
Dichloroacetic Acid	4.4255 µg/L No EPA limit set worst single sample: 10.8 µg/L	50/112	SYR4	2012–2019
Dibromoacetic Acid	2.329 µg/L No EPA limit set worst single sample: 3.04 µg/L	27/112	SYR4	2012–2019
Barium	79.25 µg/L 4% of the EPA limit 2000 µg/L worst single sample: 90 µg/L	26/26	SYR4	2012–2018
Lead	0.0036 mg/L 24% of the EPA limit 0.0150 mg/L	25/25	LCR	2025
1,1-Dichloroethylene	7.17 µg/L 102% of the EPA limit, at the 95th percentile of samples — 7 µg/L worst single sample: 10.8 µg/L	16/140	SYR4	2012–2019
Fluoride	1025 µg/L 26% of the EPA limit 4000 µg/L worst single sample: 1100 µg/L	16/26	SYR4	2012–2018
Monochloroacetic Acid	3.45 µg/L No EPA limit set worst single sample: 3.69 µg/L	4/112	SYR4	2012–2019
Monobromoacetic Acid	5.376 µg/L No EPA limit set worst single sample: 5.55 µg/L	3/112	SYR4	2012–2019
Chromium	1.8 µg/L 1.8% of the EPA limit 100 µg/L	1/26	SYR4	2012–2018

75 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,2,4-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 TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: MATTHEW L MOSTOLLER
Phone: 9782639107
Email: [email protected]

Frequently asked questions about Acton Water Supply District

Is Acton Water Supply District tap water safe to drink?

EPA monitoring detected 27 contaminants in Acton Water Supply 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 Acton Water Supply District's water?

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

How many people does Acton Water Supply District serve?

Acton Water Supply District reports serving 21,285 people in Massachusetts, per its EPA record.

Has Acton Water Supply District had any water quality violations?

The EPA has 113 violations on file for Acton Water Supply District, of which 37 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.