Is Winchester, CT Tap Water Safe? Quality & Contaminants

What was found in Winchester's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Fluoride	1119.5 µg/L 28% of the EPA limit 4000 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Copper	243.75 µg/L 19% of the EPA limit 1300 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
TTHM	89.1 µg/L 111% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Chloroform	81.8 µg/L No EPA limit set Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Total Haloacetic Acids (HAA5)	48 µg/L 80% of the EPA limit 60 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Lead	44.685 µg/L 298% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Nitrate-Nitrite	36.17 µg/L 0.4% of the EPA limit 10000 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Trichloroacetic Acid	28.36 µg/L No EPA limit set Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Dichloroacetic Acid	20.54 µg/L No EPA limit set Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Nitrate	15 µg/L 0.2% of the EPA limit 10000 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Nitrite	13 µg/L 1.3% of the EPA limit 1000 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Barium	12.22 µg/L 0.6% of the EPA limit 2000 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Bromodichloromethane	6.2 µg/L No EPA limit set Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Dibromoacetic Acid	5.379 µg/L No EPA limit set Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Chromium	3.677 µg/L 3.7% of the EPA limit 100 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Monochloroacetic Acid	3.44 µg/L No EPA limit set Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Monobromoacetic Acid	0.8900 µg/L No EPA limit set Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Dibromochloromethane	0.6000 µg/L No EPA limit set Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Combined Radium (-226 And -228)	0.5470 pCi/L 11% of the EPA limit 5 pCi/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Beryllium, Total	0.3100 µg/L 7.8% of the EPA limit 4 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Gross Alpha, Excl. Radon And U	0.2920 pCi/L 1.9% of the EPA limit 15 pCi/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Cadmium	0.2300 µg/L 4.6% of the EPA limit 5 µg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2019	1/1	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: WINSTED WATER WORKS · 7,784 people · 2025	1/1	LCR

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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Winchester

Supplier	Population served
WINSTED WATER WORKS	7,784

Frequently asked questions about Winchester tap water

Is Winchester tap water safe to drink?

EPA testing detected 23 contaminants in the water serving Winchester. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Winchester?

1 public water supplier report drinking-water monitoring for Winchester, Connecticut to the EPA. Each is listed above with its population served.

What contaminants are in Winchester's water?

The contaminants EPA monitoring detected in Winchester include Fluoride, Copper, TTHM, Chloroform, Total Haloacetic Acids (HAA5). The full list, with the level at the main supplier and the data source, is in the table above.

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.