Is Winchester Water Dept Tap Water Safe? Quality Report

Water source: Surface water
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

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	1997-06-01 → 1997-06-30
MCL	Health-based	Archived	1996-04-01 → 1996-04-30
MCL	Health-based	Archived	1995-08-01 → 1995-08-31
TT	Health-based	Resolved	1992-01-01 → 1996-06-30
MR	Monitoring	Archived	2026-01-01 → 2026-03-31
MR	Monitoring	Archived	2026-01-01 → 2026-03-31
MR	Monitoring	Archived	2026-01-01 → 2026-03-31
MR	Monitoring	Archived	2026-01-01 → 2026-03-31
MR	Monitoring	Archived	2026-01-01 → 2026-03-31
MR	Monitoring	Archived	2026-01-01 → 2026-03-31

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
Bromodichloromethane	11.165 µg/L No EPA limit set worst single sample: 12.5 µg/L	128/128	SYR4	2012–2019
Chloroform	29.23 µg/L No EPA limit set worst single sample: 37.9 µg/L	128/128	SYR4	2012–2019
Dibromochloromethane	4.466 µg/L No EPA limit set worst single sample: 5.08 µg/L	128/128	SYR4	2012–2019
TTHM	43.995 µg/L 55% of the EPA limit 80 µg/L worst single sample: 53.1 µg/L	128/128	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	11.4 µg/L 19% of the EPA limit 60 µg/L worst single sample: 16.7 µg/L	117/128	SYR4	2012–2019
Trichloroacetic Acid	5.695 µg/L No EPA limit set worst single sample: 7.19 µg/L	111/128	SYR4	2012–2019
Dichloroacetic Acid	7.304 µg/L No EPA limit set worst single sample: 12.9 µg/L	107/128	SYR4	2012–2019
Lead	0.0042 mg/L 28% of the EPA limit 0.0150 mg/L	16/16	LCR	2023
Barium	9.55 µg/L 0.5% of the EPA limit 2000 µg/L worst single sample: 9.7 µg/L	7/7	SYR4	2012–2019
Fluoride	1100 µg/L 28% of the EPA limit 4000 µg/L	5/6	SYR4	2012–2019
Bromoform	1.343 µg/L No EPA limit set worst single sample: 1.43 µg/L	4/128	SYR4	2012–2019
Antimony, Total	2 µg/L 33% of the EPA limit 6 µg/L	1/7	SYR4	2012–2019
Chromium	1.2 µg/L 1.2% of the EPA limit 100 µg/L	1/7	SYR4	2012–2019
Dibromoacetic Acid	1.01 µg/L No EPA limit set	1/128	SYR4	2012–2019
Monochloroacetic Acid	2.15 µg/L No EPA limit set	1/128	SYR4	2012–2019

86 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-PF3ONSAdonaArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitrateNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: DAVID SERRATORE
Phone: 7817217100
Email: [email protected]

Frequently asked questions about Winchester Water Dept

Is Winchester Water Dept tap water safe to drink?

EPA monitoring detected 15 contaminants in Winchester 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 Winchester Water Dept's water?

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

How many people does Winchester Water Dept serve?

Winchester Water Dept reports serving 22,970 people in Massachusetts, per its EPA record.

Has Winchester Water Dept had any water quality violations?

The EPA has 64 violations on file for Winchester Water Dept, of which 4 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.