Dibromochloromethane
Danbury Water Department
Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 2.69 ppb | 34 | 33 | ND - 5.70 ppb |
| 2019 | 2.48 ppb | 34 | 34 | 1.40 ppb - 4.60 ppb |
| 2020 | 2.53 ppb | 35 | 35 | 1.000 ppb - 4.80 ppb |
| 2021 | 1.89 ppb | 26 | 26 | 0.800 ppb - 3.70 ppb |
| 2022 | 1.95 ppb | 26 | 20 | ND - 3.89 ppb |
| 2023 | 2.04 ppb | 38 | 36 | ND - 3.80 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.1 ppb
The EWG Health Guideline of 0.1 ppb for dibromochloromethane was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-02-21 | 210745GE | 2.74 ppb |
| 2018-02-21 | 210744GE | 1.89 ppb |
| 2018-03-14 | 211584GE | 2.09 ppb |
| 2018-03-14 | 211586GE | 1.96 ppb |
| 2018-03-14 | 211588GE | 2.01 ppb |
| 2018-03-14 | 211590GE | 3.17 ppb |
| 2018-03-14 | 211598GE | 1.91 ppb |
| 2018-03-15 | 211592GE | ND |
| 2018-03-15 | 211594GE | 2.02 ppb |
| 2018-03-15 | 211596GE | 3.23 ppb |
| 2018-06-19 | 215736GE | 2.09 ppb |
| 2018-06-19 | 215738GE | 2.39 ppb |
| 2018-06-19 | 215742GE | 3.66 ppb |
| 2018-06-19 | 215744GE | 3.79 ppb |
| 2018-06-19 | 215750GE | 2.18 ppb |
| 2018-06-20 | 215746GE | 2.30 ppb |
| 2018-06-20 | 215748GE | 3.68 ppb |
| 2018-06-20 | 215740GE | 2.09 ppb |
| 2018-09-14 | DBP 200505484 | 2.70 ppb |
| 2018-09-14 | DBP 200505486 | 2.60 ppb |
| 2018-09-14 | DBP 200505491 | 5.60 ppb |
| 2018-09-14 | DBP 200505493 | 3.50 ppb |
| 2018-09-14 | DBP 200505495 | 5.70 ppb |
| 2018-09-14 | DBP 200505497 | 2.30 ppb |
| 2018-09-14 | DBP 200505499 | 3.40 ppb |
| 2018-09-17 | DBP 200505658 | 5.60 ppb |
| 2018-12-14 | DBP 200516093 | 2.10 ppb |
| 2018-12-14 | DBP 200516094 | 1.50 ppb |
| 2018-12-14 | DBP 200516095 | 1.40 ppb |
| 2018-12-14 | DBP 200516096 | 3.10 ppb |
| 2018-12-14 | DBP 200516097 | 2.80 ppb |
| 2018-12-14 | DBP 200516098 | 1.20 ppb |
| 2018-12-14 | DBP 200516099 | 3.00 ppb |
| 2018-12-14 | DBP 200516100 | 1.60 ppb |
| 2019-03-14 | DBP 200524760 | 1.90 ppb |
| 2019-03-14 | DBP 200524761 | 1.50 ppb |
| 2019-03-14 | DBP 200524762 | 1.50 ppb |
| 2019-03-14 | DBP 200524763 | 2.70 ppb |
| 2019-03-14 | DBP 200524764 | 2.20 ppb |
| 2019-03-14 | DBP 200524765 | 1.80 ppb |
| 2019-03-14 | DBP 200524766 | 2.40 ppb |
| 2019-03-14 | DBP 200524767 | 1.60 ppb |
| 2019-06-20 | DBP 200537265 | 2.20 ppb |
| 2019-06-20 | DBP 200537266 | 1.90 ppb |
| 2019-06-20 | DBP 200537267 | 1.60 ppb |
| 2019-06-20 | DBP 200537268 | 3.20 ppb |
| 2019-06-20 | DBP 200537269 | 2.80 ppb |
| 2019-06-20 | DBP 200537270 | 2.10 ppb |
| 2019-06-20 | DBP 200537271 | 3.20 ppb |
| 2019-06-20 | DBP 200537272 | 1.80 ppb |
| 2019-08-15 | VOC1 200545121 | 2.20 ppb |
| 2019-08-15 | VOC1 200545122 | 2.10 ppb |
| 2019-09-19 | DBP 200549612 | 3.50 ppb |
| 2019-09-19 | DBP 200549613 | 2.20 ppb |
| 2019-09-19 | DBP 200549614 | 2.40 ppb |
| 2019-09-19 | DBP 200549615 | 3.40 ppb |
| 2019-09-19 | DBP 200549616 | 3.00 ppb |
| 2019-09-19 | DBP 200549617 | 3.60 ppb |
| 2019-09-19 | DBP 200549618 | 3.10 ppb |
| 2019-09-19 | DBP 200549619 | 2.70 ppb |
| 2019-12-19 | DBP 200560926 | 2.30 ppb |
| 2019-12-19 | DBP 200560927 | 1.80 ppb |
| 2019-12-19 | DBP 200560929 | 1.40 ppb |
| 2019-12-19 | DBP 200560930 | 1.90 ppb |
| 2019-12-19 | DBP 200560931 | 4.20 ppb |
| 2019-12-19 | DBP 200560932 | 4.60 ppb |
| 2019-12-19 | DBP 200560934 | 1.70 ppb |
| 2019-12-19 | DBP 200560935 | 3.80 ppb |
| 2020-02-20 | VOC1 200566893 | 2.40 ppb |
| 2020-02-20 | VOC1 200566892 | 1.30 ppb |
| 2020-02-21 | VOC1 200566982 | 2.10 ppb |
| 2020-03-19 | DBP 200569976 | 2.60 ppb |
| 2020-03-19 | DBP 200569977 | 2.20 ppb |
| 2020-03-19 | DBP 200569978 | 2.20 ppb |
| 2020-03-19 | DBP 200569979 | 4.80 ppb |
| 2020-03-19 | DBP 200569980 | 3.90 ppb |
| 2020-03-19 | DBP 200569981 | 1.70 ppb |
| 2020-03-19 | DBP 200569982 | 4.00 ppb |
| 2020-03-19 | DBP 200569983 | 2.00 ppb |
| 2020-06-18 | DBP 200579794 | 2.90 ppb |
| 2020-06-18 | DBP 200579795 | 2.10 ppb |
| 2020-06-18 | DBP 200579796 | 2.10 ppb |
| 2020-06-18 | DBP 200579797 | 3.80 ppb |
| 2020-06-18 | DBP 200579798 | 3.60 ppb |
| 2020-06-18 | DBP 200579799 | 1.70 ppb |
| 2020-06-18 | DBP 200579800 | 4.70 ppb |
| 2020-06-18 | DBP 200579801 | 1.80 ppb |
| 2020-09-17 | DBP 200590661 | 2.80 ppb |
| 2020-09-17 | DBP 200590662 | 2.00 ppb |
| 2020-09-17 | DBP 200590663 | 2.80 ppb |
| 2020-09-17 | DBP 200590664 | 3.40 ppb |
| 2020-09-17 | DBP 200590665 | 1.80 ppb |
| 2020-09-17 | DBP 200590666 | 1.40 ppb |
| 2020-09-17 | DBP 200590667 | 3.20 ppb |
| 2020-09-17 | DBP 200590668 | 2.90 ppb |
| 2020-12-18 | DBP 200601598 | 1.70 ppb |
| 2020-12-18 | DBP 200601599 | 1.50 ppb |
| 2020-12-18 | DBP 200601600 | 1.000 ppb |
| 2020-12-18 | DBP 200601601 | 2.60 ppb |
| 2020-12-18 | DBP 200601602 | 2.80 ppb |
| 2020-12-18 | DBP 200601603 | 1.90 ppb |
| 2020-12-18 | DBP 200601604 | 3.20 ppb |
| 2020-12-18 | DBP 200601605 | 1.60 ppb |
| 2021-01-21 | VOC1 200604571 | 1.60 ppb |
| 2021-01-21 | VOC1 200604570 | 0.800 ppb |
| 2021-03-18 | DBP 200610316 | 1.60 ppb |
| 2021-03-18 | DBP 200610317 | 1.50 ppb |
| 2021-03-18 | DBP 200610318 | 1.10 ppb |
| 2021-03-18 | DBP 200610319 | 2.40 ppb |
| 2021-03-18 | DBP 200610320 | 3.70 ppb |
| 2021-03-18 | DBP 200610321 | 1.60 ppb |
| 2021-03-18 | DBP 200610322 | 2.60 ppb |
| 2021-03-18 | DBP 200610323 | 1.30 ppb |
| 2021-06-17 | DBP 200621341 | 1.80 ppb |
| 2021-06-17 | DBP 200621342 | 1.70 ppb |
| 2021-06-17 | DBP 200621343 | 2.90 ppb |
| 2021-06-17 | DBP 200621344 | 2.90 ppb |
| 2021-06-17 | DBP 200621345 | 1.20 ppb |
| 2021-06-17 | DBP 200621346 | 1.40 ppb |
| 2021-06-17 | DBP 200621347 | 2.50 ppb |
| 2021-06-17 | DBP 200621348 | 1.80 ppb |
| 2021-12-13 | 277826X | 0.970 ppb |
| 2021-12-14 | 277822 | 1.62 ppb |
| 2021-12-14 | 277828X | 2.84 ppb |
| 2021-12-14 | 277830X | 2.63 ppb |
| 2021-12-14 | 277832X | 1.26 ppb |
| 2021-12-14 | 277834X | 2.60 ppb |
| 2021-12-14 | 277836X | 1.32 ppb |
| 2021-12-14 | 277824X | 1.46 ppb |
| 2022-01-20 | 279326 | 1.95 ppb |
| 2022-01-20 | 279325 | ND |
| 2022-06-14 | 288296 | 3.42 ppb |
| 2022-06-14 | 288298 | 3.08 ppb |
| 2022-06-14 | 288302 | 3.21 ppb |
| 2022-06-14 | 288304 | 1.56 ppb |
| 2022-06-15 | 288300 | 1.84 ppb |
| 2022-06-15 | 288290 | 1.82 ppb |
| 2022-06-15 | 288292 | 1.58 ppb |
| 2022-06-15 | 288294 | 1.32 ppb |
| 2022-09-14 | 296289 | 2.80 ppb |
| 2022-09-15 | 296291 | 3.30 ppb |
| 2022-09-15 | 296293 | 3.50 ppb |
| 2022-09-15 | 296295 | 3.16 ppb |
| 2022-09-15 | 296297 | 3.89 ppb |
| 2022-09-15 | 296299 | 3.00 ppb |
| 2022-09-15 | 296301 | 2.70 ppb |
| 2022-09-15 | 296307 | 3.87 ppb |
| 2022-12-13 | 303027 | ND |
| 2022-12-13 | 303030 | 1.72 ppb |
| 2022-12-13 | 303034 | ND |
| 2022-12-13 | 303036 | 1.33 ppb |
| 2022-12-13 | 303038 | ND |
| 2022-12-14 | 303032 | 1.64 ppb |
| 2022-12-15 | 303025 | ND |
| 2022-12-15 | 303023 | ND |
| 2023-02-09 | 306232 | ND |
| 2023-02-09 | 306231 | ND |
| 2023-03-06 | 307813 | 1.62 ppb |
| 2023-03-07 | 307811 | 1.55 ppb |
| 2023-03-07 | 307812 | 1.21 ppb |
| 2023-03-07 | 307817 | 1.82 ppb |
| 2023-03-07 | 307818 | 1.000 ppb |
| 2023-03-07 | 307814 | 1.31 ppb |
| 2023-03-07 | 307816 | 1.000 ppb |
| 2023-03-08 | 307815 | 1.02 ppb |
| 2023-06-06 | N3F0423-01PPS | 2.50 ppb |
| 2023-06-06 | N3F0423-03PPS | 1.80 ppb |
| 2023-06-06 | N3F0423-06PPS | 2.30 ppb |
| 2023-06-06 | N3F0423-08PPS | 1.60 ppb |
| 2023-06-06 | N3F0423-01 | 2.50 ppb |
| 2023-06-06 | N3F0423-03 | 1.80 ppb |
| 2023-06-06 | N3F0423-06 | 2.30 ppb |
| 2023-06-06 | N3F0423-08 | 1.60 ppb |
| 2023-06-07 | N3F0423-07 | 3.20 ppb |
| 2023-06-07 | N3F0423-04 | 3.30 ppb |
| 2023-06-07 | N3F0423-02 | 2.10 ppb |
| 2023-06-08 | N3F0423-05 | 3.00 ppb |
| 2023-09-12 | CO99982 | 2.70 ppb |
| 2023-09-12 | CO99983 | 2.30 ppb |
| 2023-09-12 | CO99989 | 1.90 ppb |
| 2023-09-13 | CO99986 | 3.70 ppb |
| 2023-09-13 | CO99987 | 3.50 ppb |
| 2023-09-13 | CO99988 | 3.80 ppb |
| 2023-09-14 | CO99984 | 1.80 ppb |
| 2023-09-14 | CO99985 | 3.40 ppb |
| 2023-12-11 | CP68213 | 1.000 ppb |
| 2023-12-12 | CP68214 | 3.20 ppb |
| 2023-12-12 | CP68211 | 1.80 ppb |
| 2023-12-12 | CP68212 | 1.30 ppb |
| 2023-12-12 | CP68216 | 1.60 ppb |
| 2023-12-12 | CP68217 | 3.20 ppb |
| 2023-12-12 | CP68218 | 1.20 ppb |
| 2023-12-13 | CP68215 | 2.60 ppb |