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Tap water quality report

Thomaston, CT

EPA monitoring detected 14 contaminants across the 1 water supplier serving Thomaston. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
3,789
people served
14
contaminants found
Connecticut rankings Lead in Connecticut PFAS in Connecticut

What was found in Thomaston'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
1120 µg/L 11%
of the EPA limit 10000 µg/L
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2019
1/1 SYR4
Nitrate-Nitrite
990.4999999999998 µg/L 9.9%
of the EPA limit 10000 µg/L
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2019
1/1 SYR4
Copper
168.39999999999998 µg/L 13%
of the EPA limit 1300 µg/L
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2018
1/1 SYR4
Barium
25.85 µg/L 1.3%
of the EPA limit 2000 µg/L
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2016
1/1 SYR4
Lead
13.534999999999991 µg/L 90%
of the EPA limit 15 µg/L
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2018
1/1 SYR4
TTHM
5.805 µg/L 7.3%
of the EPA limit 80 µg/L
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2019
1/1 SYR4
Dibromochloromethane
1.8099999999999994 µg/L
No EPA limit set
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2019
1/1 SYR4
Bromodichloromethane
1.7599999999999998 µg/L
No EPA limit set
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2019
1/1 SYR4
Chloroform
1.7599999999999998 µg/L
No EPA limit set
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
1.4849999999999999 µg/L 2.5%
of the EPA limit 60 µg/L
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2019
1/1 SYR4
Di(2-ethylhexyl) Phthalate
1.3 µg/L 22%
of the EPA limit 6 µg/L
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.18 µg/L
No EPA limit set
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2019
1/1 SYR4
Bromoform
0.9145 µg/L
No EPA limit set
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2019
1/1 SYR4
Lead
0.0028 mg/L 19%
of the EPA limit 0.0150 mg/L
Main supplier: CTWC - NAUGATUCK REG-THOMASTON SYSTEM · 3,789 people · 2024
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 Thomaston

SupplierPopulation served
CTWC - NAUGATUCK REG-THOMASTON SYSTEM 3,789

Frequently asked questions about Thomaston tap water

Is Thomaston tap water safe to drink?

EPA testing detected 14 contaminants in the water serving Thomaston. 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 Thomaston?

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

What contaminants are in Thomaston's water?

The contaminants EPA monitoring detected in Thomaston include Nitrate, Nitrate-Nitrite, Copper, Barium, Lead. 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.