Water Quality: Danbury, CT
13 water systems • 64,443 people served
Multiple Health ViolationsWater Quality Summary
Danbury is served by 13 public water systems with a combined service population of 64,443 people, and has 1,192 EPA Safe Drinking Water Act violations on record. Critically, 34 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Danbury's violation count is 372% above the national average for Connecticut. Contaminants associated with violations include Disinfection Byproducts, E. coli, Gross Alpha, Selenium, Stage 2 DBP.
Contaminants Found
Broad category of chemicals formed during disinfection, associated with increased cancer risk and adverse reproductive effects.
Common source: Reaction of disinfectants (chlorine, ozone, chloramines) with organic matter
Causes gastrointestinal illness; certain strains (e.g., O157:H7) can cause severe kidney failure and death.
Common source: Fecal contamination from humans or animals entering the water supply
EPA limit: Zero (no E. coli permitted in drinking water)
Alpha-emitting radioactive particles increase cancer risk, particularly from bone and other internal cancers.
Common source: Natural uranium and radium in geological formations
EPA limit: 15 pCi/L (excluding radon and uranium)
Hair loss, nail brittleness, and nervous system damage at elevated concentrations.
Common source: Natural geological deposits, mining discharges, oil refinery waste
EPA limit: 0.05 mg/L (50 ppb)
Trihalomethanes and haloacetic acids that increase cancer risk and may cause adverse reproductive outcomes.
Common source: Chlorine disinfection reacting with natural organic matter in source water
EPA limit: TTHM: 0.080 mg/L; HAA5: 0.060 mg/L
Water Systems Serving Danbury
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| DANBURY WATER DEPARTMENT | CT0340011 | Surface Water | 62,055 | 19 |
| LAKE WAUBEEKA ASSOCIATION | CT0340171 | Surface Water | 712 | 8 |
| STONY HILL VILLAGE CONDOMINIUM ASSN | CT0180251 | Groundwater | 392 | 470 |
| AQUA VISTA ASSOC, INC | CT0340111 | Groundwater | 388 | 22 |
| HAWTHORNE TERRACE ASSOC | CT0340151 | Groundwater | 156 | 71 |
| BROOKFIELD HILLS CONDOMINIUM UNIT OWNERS | CT0180171 | Groundwater | 144 | 51 |
| SNUG HARBOR DEVELOPMENT CORP | CT0340231 | Groundwater | 144 | 17 |
| DANBURY WATER DEPT-RIDGEVIEW GARDENS | CT0340051 | Groundwater | 116 | 111 |
| CORNELL HILLS ASSOC, INC | CT0340181 | Surface Water | 108 | 68 |
| WOODCREEK VILLAGE CONDOMINIUM ASSN, INC | CT0180201 | Groundwater | 72 | 47 |
| CEDAR TERRACE PROP OWNERS ASSN | CT0340141 | Groundwater | 66 | 131 |
| ELMWOOD COURT, LLC | CT0090114 | Groundwater | 54 | 120 |
| 39 HOP BROOK RD - APT COMPLEX | CT0189971 | Groundwater | 36 | 57 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Connecticut
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.