Dibromochloromethane
Madison 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.
106
Samples
0
Samples exceeding legal limit (MCL)
89
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 1.01 ppb | 20 | 12 | ND - 3.01 ppb |
| 2015 | 1.82 ppb | 16 | 16 | 0.540 ppb - 3.93 ppb |
| 2016 | 1.66 ppb | 16 | 15 | ND - 3.58 ppb |
| 2017 | 1.70 ppb | 16 | 16 | 0.554 ppb - 2.98 ppb |
| 2018 | 1.19 ppb | 22 | 20 | ND - 3.14 ppb |
| 2019 | 0.967 ppb | 16 | 10 | ND - 2.91 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.1 ppb
The EWG Health Guideline of 0.1 ppb for dibromochloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-03-03 | AB47857TH | 2.71 ppb |
| 2014-03-03 | AB47856TH | ND |
| 2014-03-03 | AB47858TH | 0.885 ppb |
| 2014-03-03 | AB47855TH | 0.957 ppb |
| 2014-06-03 | AB51640TH | ND |
| 2014-06-03 | AB51639TH | 0.844 ppb |
| 2014-06-03 | AB51641TH | 0.664 ppb |
| 2014-06-03 | AB51638TH | ND |
| 2014-09-03 | L5211811-3 | ND |
| 2014-09-03 | L5211811-2 | 2.21 ppb |
| 2014-09-03 | L5211811-4 | 3.01 ppb |
| 2014-09-03 | L5211811-1 | 1.50 ppb |
| 2014-09-03 | L5211814-2 | ND |
| 2014-09-03 | L5211814-4 | ND |
| 2014-09-09 | L5240310-2 | ND |
| 2014-09-09 | L5240310-4 | ND |
| 2014-12-02 | AB59055TH | 2.01 ppb |
| 2014-12-02 | AB59054TH | 2.62 ppb |
| 2014-12-02 | AB59056TH | 2.07 ppb |
| 2014-12-02 | AB59053TH | 0.781 ppb |
| 2015-03-04 | AB62616TH | 1.21 ppb |
| 2015-03-04 | AB62614TH | 2.13 ppb |
| 2015-03-04 | AB62617TH | 1.55 ppb |
| 2015-03-04 | AB62615TH | 0.540 ppb |
| 2015-06-16 | AB67019TH | 0.609 ppb |
| 2015-06-16 | AB67017TH | 1.84 ppb |
| 2015-06-16 | AB67020TH | 2.74 ppb |
| 2015-06-16 | AB67018TH | 1.03 ppb |
| 2015-09-08 | AB70875TH | 2.41 ppb |
| 2015-09-08 | AB70873TH | 1.85 ppb |
| 2015-09-08 | AB70872TH | 1.15 ppb |
| 2015-09-08 | AB70874TH | 0.755 ppb |
| 2015-12-08 | AB74635TH | 3.50 ppb |
| 2015-12-08 | AB74634TH | 3.93 ppb |
| 2015-12-08 | AB74633TH | 2.97 ppb |
| 2015-12-08 | AB74636TH | 0.890 ppb |
| 2016-03-08 | AB78061TH | 1.47 ppb |
| 2016-03-08 | AB78060TH | 3.52 ppb |
| 2016-03-08 | AB78059TH | 2.03 ppb |
| 2016-03-08 | AB78062TH | 1.19 ppb |
| 2016-06-14 | AB82524TH | ND |
| 2016-06-14 | AB82523TH | 1.48 ppb |
| 2016-06-14 | AB82522TH | 3.58 ppb |
| 2016-06-14 | AB82525TH | 0.752 ppb |
| 2016-09-12 | AB86394TH | 1.90 ppb |
| 2016-09-12 | AB86395TH | 1.34 ppb |
| 2016-09-12 | AB86397TH | 1.36 ppb |
| 2016-09-12 | AB86396TH | 0.708 ppb |
| 2016-12-13 | AB90417TH | 1.01 ppb |
| 2016-12-13 | AB90418TH | 2.66 ppb |
| 2016-12-13 | AB90420TH | 2.74 ppb |
| 2016-12-13 | AB90419TH | 0.876 ppb |
| 2017-03-13 | AB93937TH | 1.82 ppb |
| 2017-03-13 | AB93940TH | 1.65 ppb |
| 2017-03-13 | AB93938TH | 1.96 ppb |
| 2017-03-13 | AB93939TH | 0.554 ppb |
| 2017-06-20 | AB97881TH | 0.711 ppb |
| 2017-06-20 | AB97883TH | 2.84 ppb |
| 2017-06-20 | AB97882TH | 1.83 ppb |
| 2017-06-20 | AB97880TH | 1.53 ppb |
| 2017-09-12 | AC01270TH | 0.560 ppb |
| 2017-09-12 | AC01271TH | 2.98 ppb |
| 2017-09-12 | AC01269TH | 2.78 ppb |
| 2017-09-12 | AC01272TH | 1.11 ppb |
| 2017-12-12 | AC04941TH | 0.810 ppb |
| 2017-12-12 | AC04942TH | 1.83 ppb |
| 2017-12-12 | AC04939TH | 2.74 ppb |
| 2017-12-12 | AC04940TH | 1.52 ppb |
| 2018-02-13 | JC60783-2 | 0.160 ppb |
| 2018-02-13 | JC60783-4 | 1.20 ppb |
| 2018-03-15 | AC08550TH | 0.731 ppb |
| 2018-03-15 | AC08551TH | 1.77 ppb |
| 2018-03-15 | AC08549TH | 2.40 ppb |
| 2018-03-15 | AC08552TH | 0.989 ppb |
| 2018-04-10 | JC64164-1 | 0.120 ppb |
| 2018-04-10 | JC64164-4 | 0.930 ppb |
| 2018-04-10 | JC64164-3 | 0.650 ppb |
| 2018-04-10 | JC64164-2 | ND |
| 2018-06-22 | AC12529TH | ND |
| 2018-06-22 | AC12527TH | 2.20 ppb |
| 2018-06-22 | AC12528TH | 1.69 ppb |
| 2018-06-22 | AC12526TH | 0.535 ppb |
| 2018-09-17 | AC16244TH | 0.795 ppb |
| 2018-09-17 | AC16246TH | 3.14 ppb |
| 2018-09-17 | AC16247TH | 1.68 ppb |
| 2018-09-17 | AC16245TH | 0.903 ppb |
| 2018-12-06 | AC19718TH | 1.08 ppb |
| 2018-12-06 | AC19717TH | 1.65 ppb |
| 2018-12-06 | AC19716TH | 2.20 ppb |
| 2018-12-06 | AC19715TH | 1.28 ppb |
| 2019-03-07 | AC23585TH | 0.750 ppb |
| 2019-03-07 | AC23586TH | ND |
| 2019-03-07 | AC23588TH | 2.65 ppb |
| 2019-03-07 | AC23587TH | 1.11 ppb |
| 2019-06-06 | AC27598TH | ND |
| 2019-06-06 | AC27599TH | ND |
| 2019-06-06 | AC27597TH | 2.64 ppb |
| 2019-06-06 | AC27600TH | 0.730 ppb |
| 2019-09-09 | AC32085TH | ND |
| 2019-09-09 | AC32087TH | ND |
| 2019-09-09 | AC32088TH | 1.81 ppb |
| 2019-09-09 | AC32086TH | 1.44 ppb |
| 2019-12-05 | AC36038TH | 0.653 ppb |
| 2019-12-05 | AC36039TH | ND |
| 2019-12-05 | AC36041TH | 2.91 ppb |
| 2019-12-05 | AC36040TH | 0.784 ppb |