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Tap water quality report

Preston, CT

EPA monitoring detected 23 contaminants across the 3 water suppliers serving Preston. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

3
water suppliers
36,793
people served
23
contaminants found
Connecticut rankings Lead in Connecticut PFAS in Connecticut

What was found in Preston'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
Nitrate-Nitrite
3000 µg/L 30%
of the EPA limit 10000 µg/L
 3/3 SYR4
Nitrate
2500 µg/L 25%
of the EPA limit 10000 µg/L
 3/3 SYR4
Copper
1230 µg/L 95%
of the EPA limit 1300 µg/L
 3/3 SYR4
Fluoride
1000 µg/L 25%
of the EPA limit 4000 µg/L
 2/3 SYR4
Nitrite
860 µg/L 86%
of the EPA limit 1000 µg/L
 1/3 SYR4
TTHM
240.89 µg/L 301%
of the EPA limit, in the worst sample — 80 µg/L
 1/3 SYR4
Total Haloacetic Acids (HAA5)
96.6 µg/L 161%
of the EPA limit, in the worst sample — 60 µg/L
 1/3 SYR4
Chloroform
64 µg/L
No EPA limit set
 1/3 SYR4
Lead
39 µg/L 260%
of the EPA limit, in the worst sample — 15 µg/L
 3/3 SYR4
Barium
30 µg/L 1.5%
of the EPA limit 2000 µg/L
 3/3 SYR4
Bromodichloromethane
8.7 µg/L
No EPA limit set
 1/3 SYR4
Selenium
2.6 µg/L 5.2%
of the EPA limit 50 µg/L
 1/3 SYR4
Arsenic
2.3 µg/L 23%
of the EPA limit 10 µg/L
 1/3 SYR4
Combined Uranium
2.1 µg/L 7%
of the EPA limit 30 µg/L
 2/3 SYR4
Combined Radium (-226 And -228)
1.09 pCi/L 22%
of the EPA limit 5 pCi/L
 1/3 SYR4
Dibromochloromethane
0.9000 µg/L
No EPA limit set
 1/3 SYR4
Beryllium, Total
0.2000 µg/L 5%
of the EPA limit 4 µg/L
 1/3 SYR4
PFOS
0.0162 µg/L
No EPA limit set
 1/3 UCMR-5
PFHXS
0.0125 µg/L
No EPA limit set
 1/3 UCMR-5
PFOA
0.0067 µg/L
No EPA limit set
 1/3 UCMR-5
PFBS
0.0060 µg/L
No EPA limit set
 1/3 UCMR-5
Lead
0.0053 mg/L 35%
of the EPA limit 0.0150 mg/L
 3/3 LCR
Pfpea
0.0039 µg/L
No EPA limit set
 1/3 UCMR-5
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 Preston

SupplierPopulation served
NORWICH PUBLIC UTILITIES 36,163
PRESTON PLAINS WATER COMPANY 550
LINCOLN PARK ELDERLY HOUSING 80

Frequently asked questions about Preston tap water

Is Preston tap water safe to drink?

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

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

What contaminants are in Preston's water?

The contaminants EPA monitoring detected in Preston include Nitrate-Nitrite, Nitrate, Copper, Fluoride, Nitrite. 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.