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Tap water quality report

Harwinton, CT

EPA monitoring detected 23 contaminants across the 2 water suppliers serving Harwinton. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

2
water suppliers
37,955
people served
23
contaminants found
Connecticut rankings Lead in Connecticut PFAS in Connecticut

What was found in Harwinton's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Copper
4370 µg/L 336%
of the EPA limit, in the worst sample — 1300 µg/L
 2/2 SYR4
Nitrate
2200 µg/L 22%
of the EPA limit 10000 µg/L
 2/2 SYR4
Nitrate-Nitrite
2200 µg/L 22%
of the EPA limit 10000 µg/L
 2/2 SYR4
Fluoride
670 µg/L 17%
of the EPA limit 4000 µg/L
 2/2 SYR4
TTHM
110 µg/L 138%
of the EPA limit, in the worst sample — 80 µg/L
 1/2 SYR4
Chloroform
100 µg/L
No EPA limit set
 2/2 SYR4
Lead
88.4 µg/L 589%
of the EPA limit, in the worst sample — 15 µg/L
 2/2 SYR4
Total Haloacetic Acids (HAA5)
78 µg/L 130%
of the EPA limit, in the worst sample — 60 µg/L
 1/2 SYR4
Barium
60 µg/L 3%
of the EPA limit 2000 µg/L
 2/2 SYR4
Trichloroacetic Acid
48 µg/L
No EPA limit set
 1/2 SYR4
Dichloroacetic Acid
31 µg/L
No EPA limit set
 1/2 SYR4
Bromodichloromethane
5.9 µg/L
No EPA limit set
 2/2 SYR4
Monochloroacetic Acid
3.7 µg/L
No EPA limit set
 1/2 SYR4
Chromium
3 µg/L 3%
of the EPA limit 100 µg/L
 1/2 SYR4
Monobromoacetic Acid
2.6 µg/L
No EPA limit set
 1/2 SYR4
Combined Uranium
2.39 µg/L 8%
of the EPA limit 30 µg/L
 1/2 SYR4
Dibromoacetic Acid
2.1 µg/L
No EPA limit set
 1/2 SYR4
Toluene
1.5 µg/L 0.2%
of the EPA limit 1000 µg/L
 1/2 SYR4
Dibromochloromethane
1.1 µg/L
No EPA limit set
 1/2 SYR4
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
 1/2 SYR4
Styrene
0.6000 µg/L 0.6%
of the EPA limit 100 µg/L
 1/2 SYR4
Combined Radium (-226 And -228)
0.5300 pCi/L 11%
of the EPA limit 5 pCi/L
 1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 2/2 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 single worst sample on record — 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 Harwinton

SupplierPopulation served
TORRINGTON WATER COMPANY 37,915
GARDEN LANE APARTMENTS 40

Frequently asked questions about Harwinton tap water

Is Harwinton tap water safe to drink?

EPA testing detected 23 contaminants in the water serving Harwinton. 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 Harwinton?

2 public water suppliers report drinking-water monitoring for Harwinton, Connecticut to the EPA. Each is listed above with its population served.

What contaminants are in Harwinton's water?

The contaminants EPA monitoring detected in Harwinton include Copper, Nitrate, Nitrate-Nitrite, Fluoride, TTHM. The full list, with the highest level found 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.