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Tap water quality report

Plymouth, CT

EPA monitoring detected 23 contaminants across the 3 water suppliers serving Plymouth. 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
61,475
people served
23
contaminants found
Connecticut rankings Lead in Connecticut PFAS in Connecticut

What was found in Plymouth'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
3600 µg/L 277%
of the EPA limit, in the worst sample — 1300 µg/L
 3/3 SYR4
Nitrate
2419 µg/L 24%
of the EPA limit 10000 µg/L
 3/3 SYR4
Nitrate-Nitrite
2419 µg/L 24%
of the EPA limit 10000 µg/L
 3/3 SYR4
Fluoride
1100 µg/L 28%
of the EPA limit 4000 µg/L
 1/3 SYR4
Barium
350 µg/L 18%
of the EPA limit 2000 µg/L
 3/3 SYR4
Lead
150 µg/L 1000%
of the EPA limit, in the worst sample — 15 µg/L
 3/3 SYR4
TTHM
101 µg/L 126%
of the EPA limit, in the worst sample — 80 µg/L
 3/3 SYR4
Chloroform
88 µg/L
No EPA limit set
 3/3 SYR4
Total Haloacetic Acids (HAA5)
65 µg/L 108%
of the EPA limit, in the worst sample — 60 µg/L
 3/3 SYR4
Trichloroacetic Acid
32 µg/L
No EPA limit set
 1/3 SYR4
Dichloroacetic Acid
31 µg/L
No EPA limit set
 2/3 SYR4
Bromodichloromethane
11 µg/L
No EPA limit set
 3/3 SYR4
Monobromoacetic Acid
11 µg/L
No EPA limit set
 1/3 SYR4
Dibromochloromethane
7.7 µg/L
No EPA limit set
 3/3 SYR4
Bromoform
5.7 µg/L
No EPA limit set
 3/3 SYR4
Monochloroacetic Acid
5 µg/L
No EPA limit set
 1/3 SYR4
Dibromoacetic Acid
2 µg/L
No EPA limit set
 3/3 SYR4
Gross Alpha, Excl. Radon And U
1.46 pCi/L 9.7%
of the EPA limit 15 pCi/L
 1/3 SYR4
Di(2-ethylhexyl) Phthalate
1.3 µg/L 22%
of the EPA limit 6 µg/L
 2/3 SYR4
Combined Radium (-226 And -228)
0.9850 pCi/L 20%
of the EPA limit 5 pCi/L
 1/3 SYR4
PFOA
0.0041 µg/L
No EPA limit set
 1/3 UCMR-5
Pfpea
0.0031 µg/L
No EPA limit set
 1/3 UCMR-5
Lead
0.0028 mg/L 19%
of the EPA limit 0.0150 mg/L
 3/3 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 Plymouth

SupplierPopulation served
BRISTOL WATER DEPARTMENT 52,079
CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM 5,607
CTWC - NAUGATUCK REG-THOMASTON SYSTEM 3,789

Frequently asked questions about Plymouth tap water

Is Plymouth tap water safe to drink?

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

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

What contaminants are in Plymouth's water?

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