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Tap water quality report

Danbury, CT

EPA monitoring detected 34 contaminants across the 16 water suppliers serving Danbury. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

16
water suppliers
74,295
people served
34
contaminants found
Connecticut rankings Lead in Connecticut PFAS in Connecticut

What was found in Danbury'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
8100 µg/L 81%
of the EPA limit 10000 µg/L
 12/16 SYR4
Nitrate-Nitrite
8100 µg/L 81%
of the EPA limit 10000 µg/L
 12/16 SYR4
Copper
2300 µg/L 177%
of the EPA limit, in the worst sample — 1300 µg/L
 16/16 SYR4
Fluoride
950 µg/L 24%
of the EPA limit 4000 µg/L
 11/16 SYR4
Barium
490 µg/L 25%
of the EPA limit 2000 µg/L
 12/16 SYR4
TTHM
217 µg/L 271%
of the EPA limit, in the worst sample — 80 µg/L
 10/16 SYR4
Lead
212 µg/L 1413%
of the EPA limit, in the worst sample — 15 µg/L
 16/16 SYR4
Chloroform
195 µg/L
No EPA limit set
 10/16 SYR4
Total Haloacetic Acids (HAA5)
155 µg/L 258%
of the EPA limit, in the worst sample — 60 µg/L
 10/16 SYR4
Nitrite
100 µg/L 10%
of the EPA limit 1000 µg/L
 5/16 SYR4
Dichloroacetic Acid
81 µg/L
No EPA limit set
 10/16 SYR4
Trichloroacetic Acid
74 µg/L
No EPA limit set
 9/16 SYR4
Monobromoacetic Acid
23.6 µg/L
No EPA limit set
 6/16 SYR4
Bromodichloromethane
19.5 µg/L
No EPA limit set
 10/16 SYR4
Gross Alpha, Excl. Radon And U
10.727 pCi/L 72%
of the EPA limit 15 pCi/L
 3/16 SYR4
Dibromochloromethane
10.4 µg/L
No EPA limit set
 10/16 SYR4
Selenium
10 µg/L 20%
of the EPA limit 50 µg/L
 2/16 SYR4
Monochloroacetic Acid
7.3 µg/L
No EPA limit set
 7/16 SYR4
Combined Uranium
6.9 µg/L 23%
of the EPA limit 30 µg/L
 6/16 SYR4
Gross Beta Particle Activity
5.81 pCi/L
No EPA limit set
 1/16 SYR4
Chromium
4.8 µg/L 4.8%
of the EPA limit 100 µg/L
 3/16 SYR4
Bromoform
3 µg/L
No EPA limit set
 6/16 SYR4
Dibromoacetic Acid
2.6 µg/L
No EPA limit set
 10/16 SYR4
Combined Radium (-226 And -228)
1.66 pCi/L 33%
of the EPA limit 5 pCi/L
 5/16 SYR4
Di(2-ethylhexyl) Phthalate
1.5 µg/L 25%
of the EPA limit 6 µg/L
 1/16 SYR4
Antimony, Total
1 µg/L 17%
of the EPA limit 6 µg/L
 1/16 SYR4
Beryllium, Total
1 µg/L 25%
of the EPA limit 4 µg/L
 1/16 SYR4
Cyanide
1 µg/L 0.5%
of the EPA limit 200 µg/L
 1/16 SYR4
Methoxychlor
0.2200 µg/L 0.5%
of the EPA limit 40 µg/L
 1/16 SYR4
PFOA
0.0059 µg/L
No EPA limit set
 2/16 UCMR-5
Lead
0.0056 mg/L 37%
of the EPA limit 0.0150 mg/L
 16/16 LCR
PFBS
0.0043 µg/L
No EPA limit set
 2/16 UCMR-5
Pfhxa
0.0036 µg/L
No EPA limit set
 1/16 UCMR-5
Pfpea
0.0034 µg/L
No EPA limit set
 2/16 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 Danbury

SupplierPopulation served
DANBURY WATER DEPARTMENT 62,055
BETHEL WATER DEPT 9,507
LAKE WAUBEEKA ASSOCIATION 712
AQUA VISTA ASSOC, INC 388
AQUARION-INDIAN SPRING 242
AQUARION-HOLLANDALE ESTATES 200
HAWTHORNE TERRACE ASSOC 156
AQUARION-KEN OAKS 152
SNUG HARBOR DEVELOPMENT CORP 144
AQUARION-PEARCE MANOR 133
SHADY ACRES MOBILE HOME PARK 117
DANBURY WATER DEPT-RIDGEVIEW GARDENS 116
AQUARION-ROLLING RIDGE 115
CORNELL HILLS ASSOC, INC 108
AQUARION-FIELDSTONE RIDGE 84
CEDAR TERRACE PROP OWNERS ASSN 66

Frequently asked questions about Danbury tap water

Is Danbury tap water safe to drink?

EPA testing detected 34 contaminants in the water serving Danbury. 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 Danbury?

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

What contaminants are in Danbury's water?

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