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Tap water quality report

Waterbury, CT

EPA monitoring detected 58 contaminants across the 4 water suppliers serving Waterbury. 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.

4
water suppliers
142,528
people served
58
contaminants found
Connecticut rankings Lead in Connecticut PFAS in Connecticut

What was found in Waterbury'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
71 µg/L 0.7%
of the EPA limit 10000 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 2200.5 µg/L — CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
2/4 SYR4
Nitrate-Nitrite
69.5 µg/L 0.7%
of the EPA limit 10000 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 2184 µg/L — CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
2/4 SYR4
Fluoride
909 µg/L 23%
of the EPA limit 4000 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 1063 µg/L — CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
2/4 SYR4
Copper
237.5 µg/L 18%
of the EPA limit 1300 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 391.55 µg/L — WOLCOTT WATER DEPARTMENT · 2,550 people · 2019
4/4 SYR4
TTHM
83.62 µg/L 105%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 90.7 µg/L — WATERTOWN WATER & SEWER AUTHORITY · 9,972 people · 2019
4/4 SYR4
Chloroform
34.475 µg/L
No EPA limit set
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 79.55 µg/L — WATERTOWN WATER & SEWER AUTHORITY · 9,972 people · 2019
4/4 SYR4
Total Haloacetic Acids (HAA5)
54.69 µg/L 91%
of the EPA limit 60 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 60.3 µg/L — WATERTOWN WATER & SEWER AUTHORITY · 9,972 people · 2019
4/4 SYR4
Cyanide
50 µg/L 25%
of the EPA limit 200 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Trichloroacetic Acid
37.85 µg/L
No EPA limit set
Highest in the city: WOLCOTT WATER DEPARTMENT · 2,550 people · 2019
3/4 SYR4
Barium
11.45 µg/L 0.6%
of the EPA limit 2000 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 29 µg/L — CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
2/4 SYR4
Dichloroacetic Acid
26.75 µg/L
No EPA limit set
Highest in the city: WATERTOWN WATER & SEWER AUTHORITY · 9,972 people · 2019
3/4 SYR4
1,2,4-Trichlorobenzene
24.4 µg/L 35%
of the EPA limit 70 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Nitrite
16.4 µg/L 1.6%
of the EPA limit 1000 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
2/4 SYR4
Lead
15.6 µg/L 104%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
4/4 SYR4
Bromodichloromethane
5.62 µg/L
No EPA limit set
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 11.15 µg/L — CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
4/4 SYR4
Monobromoacetic Acid
11 µg/L
No EPA limit set
Highest in the city: WOLCOTT WATER DEPARTMENT · 2,550 people · 2019
2/4 SYR4
Monochloroacetic Acid
6.8 µg/L
No EPA limit set
Highest in the city: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
3/4 SYR4
Gross Alpha, Excl. Radon And U
3 pCi/L 20%
of the EPA limit 15 pCi/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 5.081 pCi/L — CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
2/4 SYR4
Dibromochloromethane
0.7750 µg/L
No EPA limit set
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 4 µg/L — WOLCOTT WATER DEPARTMENT · 2,550 people · 2019
4/4 SYR4
Bromoform
0.5000 µg/L
No EPA limit set
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
Highest in the city: 3.1 µg/L — CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
2/4 SYR4
Combined Radium (-226 And -228)
2.27 pCi/L 45%
of the EPA limit 5 pCi/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2015
2/4 SYR4
Toxaphene
2.2 µg/L 73%
of the EPA limit 3 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Combined Uranium
1.49 µg/L 5%
of the EPA limit 30 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Chromium
1 µg/L 1%
of the EPA limit 100 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Selenium
1 µg/L 2%
of the EPA limit 50 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Thallium, Total
1 µg/L 50%
of the EPA limit 2 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Dibromoacetic Acid
0.8700 µg/L
No EPA limit set
Highest in the city: WATERTOWN WATER & SEWER AUTHORITY · 9,972 people · 2019
2/4 SYR4
Antimony, Total
0.8000 µg/L 13%
of the EPA limit 6 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
1,1,1-Trichloroethane
0.5000 µg/L 0.3%
of the EPA limit 200 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
1,1,2-Trichloroethane
0.5000 µg/L 10%
of the EPA limit 5 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
1,1-Dichloroethylene
0.5000 µg/L 7.1%
of the EPA limit 7 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
1,2-Dichloroethane
0.5000 µg/L 10%
of the EPA limit 5 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
1,2-Dichloropropane
0.5000 µg/L 10%
of the EPA limit 5 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Benzene
0.5000 µg/L 10%
of the EPA limit 5 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Chlorobenzene
0.5000 µg/L 0.5%
of the EPA limit 100 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Carbon Tetrachloride
0.5000 µg/L 10%
of the EPA limit 5 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Dichloromethane
0.5000 µg/L 10%
of the EPA limit 5 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Ethylbenzene
0.5000 µg/L 0.1%
of the EPA limit 700 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Styrene
0.5000 µg/L 0.5%
of the EPA limit 100 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Tetrachloroethylene
0.5000 µg/L 10%
of the EPA limit 5 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Toluene
0.5000 µg/L 0.1%
of the EPA limit 1000 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Trichloroethylene
0.5000 µg/L 10%
of the EPA limit 5 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Vinyl Chloride
0.5000 µg/L 25%
of the EPA limit 2 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
cis-1,2-Dichloroethylene
0.5000 µg/L 0.7%
of the EPA limit 70 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
O-Dichlorobenzene
0.5000 µg/L 0.1%
of the EPA limit 600 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
P-Dichlorobenzene
0.5000 µg/L 0.7%
of the EPA limit 75 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
trans-1,2-Dichloroethylene
0.5000 µg/L 0.5%
of the EPA limit 100 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
2,4,5-TP
0.4400 µg/L 0.9%
of the EPA limit 50 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Beryllium, Total
0.3000 µg/L 7.5%
of the EPA limit 4 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Cadmium
0.3000 µg/L 6%
of the EPA limit 5 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
2,4-D
0.2200 µg/L 0.3%
of the EPA limit 70 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Methoxychlor
0.2200 µg/L 0.5%
of the EPA limit 40 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Mercury
0.2000 µg/L 10%
of the EPA limit 2 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Asbestos
0.1700 MFL 2.4%
of the EPA limit 7 MFL
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Bhc-Gamma
0.0440 µg/L 22%
of the EPA limit 0.2000 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Endrin
0.0220 µg/L 1.1%
of the EPA limit 2 µg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2019
1/4 SYR4
Lead
0.0040 mg/L 27%
of the EPA limit 0.0150 mg/L
Main supplier: WATERBURY WATER DEPARTMENT · 107,271 people · 2025
4/4 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 Waterbury

SupplierPopulation served
WATERBURY WATER DEPARTMENT 107,271
CTWC - NAUGATUCK REGION-CENTRAL SYSTEM 22,735
WATERTOWN WATER & SEWER AUTHORITY 9,972
WOLCOTT WATER DEPARTMENT 2,550

Frequently asked questions about Waterbury tap water

Is Waterbury tap water safe to drink?

EPA testing detected 58 contaminants in the water serving Waterbury. 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 Waterbury?

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

What contaminants are in Waterbury's water?

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