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Tap water quality report

Danbury Water Department

EPA monitoring tested this supplier for 109 contaminants and detected 23. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
23
detected
62,055
people served
4
health-based violations
Connecticut rankingsLead in ConnecticutPFAS in Connecticut
Water source
Surface water
Ownership
Local government
Counties served
Fairfield

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

4
health-based violations
298
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2021-07-01 → 2021-07-31
TT Health-based Resolved 2021-07-01 → 2021-07-31
TT Health-based Resolved 2021-07-01 → 2021-07-31
TT Health-based Resolved 2021-07-01 → 2021-07-31
MR Monitoring Resolved 2021-10-01 → 2021-12-31
MR Monitoring Resolved 2020-12-30
MR Monitoring Resolved 2019-07-01 → 2019-09-30
MR Monitoring Resolved 2019-07-01 → 2019-09-30
MR Monitoring Resolved 2019-07-01 → 2019-09-30
MR Monitoring Resolved 2019-07-01 → 2019-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFOA 0.0054 µg/L 7/8 2025
PFBS 0.0043 µg/L 4/8 2025
Pfpea 0.0034 µg/L 3/8 2025
Pfhxa 0.0036 µg/L 2/8 2025

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
14 µg/L
No EPA limit set
worst single sample: 19.5 µg/L
296/296 SYR4 2012–2019
Chloroform
54.25 µg/L
No EPA limit set
worst single sample: 78 µg/L
296/296 SYR4 2012–2019
Dibromochloromethane
3.712 µg/L
No EPA limit set
worst single sample: 5.7 µg/L
295/296 SYR4 2012–2019
TTHM
69.98 µg/L 87%
of the EPA limit 80 µg/L
worst single sample: 96 µg/L
282/282 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
38.502 µg/L 64%
of the EPA limit 60 µg/L
worst single sample: 48 µg/L
277/280 SYR4 2012–2019
Trichloroacetic Acid
19 µg/L
No EPA limit set
worst single sample: 25.4 µg/L
275/280 SYR4 2012–2019
Dichloroacetic Acid
18 µg/L
No EPA limit set
worst single sample: 28.8 µg/L
267/280 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 109/109 LCR 2026
Monochloroacetic Acid
4 µg/L
No EPA limit set
worst single sample: 5.3 µg/L
95/280 SYR4 2012–2019
Monobromoacetic Acid
1.53 µg/L
No EPA limit set
worst single sample: 4.7 µg/L
88/280 SYR4 2012–2019
Dibromoacetic Acid
1.285 µg/L
No EPA limit set
worst single sample: 1.5 µg/L
84/280 SYR4 2012–2019
Copper
450 µg/L 35%
of the EPA limit 1300 µg/L
worst single sample: 500 µg/L
76/77 SYR4 2012–2019
Nitrate
583 µg/L 5.8%
of the EPA limit 10000 µg/L
worst single sample: 640 µg/L
40/60 SYR4 2012–2019
Barium
22.2 µg/L 1.1%
of the EPA limit 2000 µg/L
worst single sample: 26 µg/L
37/37 SYR4 2012–2019
Fluoride
887 µg/L 22%
of the EPA limit 4000 µg/L
worst single sample: 950 µg/L
23/37 SYR4 2012–2019
Nitrate-Nitrite
580 µg/L 5.8%
of the EPA limit 10000 µg/L
worst single sample: 640 µg/L
21/34 SYR4 2012–2019
Lead
5.4 µg/L 36%
of the EPA limit 15 µg/L
worst single sample: 7 µg/L
17/77 SYR4 2012–2019
Di(2-ethylhexyl) Phthalate
1.5 µg/L 25%
of the EPA limit 6 µg/L
 1/10 SYR4 2013–2019
Nitrite
21 µg/L 2.1%
of the EPA limit 1000 µg/L
 1/30 SYR4 2012–2019
86 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DAY, DAVID M.
Phone
203-797-4539
Email
[email protected]

Frequently asked questions about Danbury Water Department

Is Danbury Water Department tap water safe to drink?

EPA monitoring detected 23 contaminants in Danbury Water Department's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Danbury Water Department's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Danbury Water Department serve?

Danbury Water Department reports serving 62,055 people in Connecticut, per its EPA record.

Has Danbury Water Department had any water quality violations?

The EPA has 298 violations on file for Danbury Water Department, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.