Dibromochloromethane
Miami Water Users Association
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 |
|---|---|---|---|---|
| 2014 | 0.0750 ppb | 8 | 3 | ND - 0.230 ppb |
| 2015 | 0.308 ppb | 8 | 7 | ND - 0.650 ppb |
| 2016 | 0.549 ppb | 8 | 8 | 0.330 ppb - 0.970 ppb |
| 2017 | 0.350 ppb | 8 | 7 | ND - 0.980 ppb |
| 2018 | 2.46 ppb | 8 | 8 | 1.10 ppb - 3.70 ppb |
| 2019 | 1.09 ppb | 8 | 8 | 0.320 ppb - 2.60 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 |
|---|---|---|
| 2014-02-18 | 1402756-001A | ND |
| 2014-03-03 | 2014007450 | 0.190 ppb |
| 2014-05-06 | 2014015063 | 0.230 ppb |
| 2014-06-03 | 2014017886 | ND |
| 2014-08-14 | 2014025788 | 0.180 ppb |
| 2014-09-10 | 2014028953 | ND |
| 2014-11-05 | 2014034628 | ND |
| 2014-12-08 | 2014037345 | ND |
| 2015-02-02 | 2015003748 | 0.200 ppb |
| 2015-03-10 | 2015007920 | 0.390 ppb |
| 2015-05-06 | 2015013677 | 0.160 ppb |
| 2015-06-10 | 2015017256 | ND |
| 2015-08-17 | 2015023907 | 0.200 ppb |
| 2015-09-01 | 2015026370 | 0.300 ppb |
| 2015-11-19 | 2015034724 | 0.560 ppb |
| 2015-12-08 | 2015036021 | 0.650 ppb |
| 2016-02-09 | 2016003930 | 0.970 ppb |
| 2016-03-08 | 2016006831 | 0.630 ppb |
| 2016-05-04 | 2016012645 | 0.500 ppb |
| 2016-06-07 | 2016016216 | 0.330 ppb |
| 2016-08-08 | 2016022728 | 0.380 ppb |
| 2016-09-06 | 2016026188 | 0.400 ppb |
| 2016-11-09 | 2016032846 | 0.580 ppb |
| 2016-12-07 | 2016035212 | 0.600 ppb |
| 2017-02-08 | 2017003807 | 0.600 ppb |
| 2017-03-08 | 2017006878 | 0.430 ppb |
| 2017-05-03 | 2017013372 | 0.310 ppb |
| 2017-06-07 | 2017016979 | 0.210 ppb |
| 2017-08-08 | 2017022968 | ND |
| 2017-09-20 | 2017027405 | 0.130 ppb |
| 2017-11-14 | 2017033032 | 0.140 ppb |
| 2017-12-18 | 2017035683 | 0.980 ppb |
| 2018-02-07 | 2018004057 | 1.10 ppb |
| 2018-03-07 | 2018006793 | 1.20 ppb |
| 2018-05-16 | 2018013964 | 2.30 ppb |
| 2018-06-12 | 2018016467 | 3.10 ppb |
| 2018-08-14 | 2018022857 | 3.70 ppb |
| 2018-09-11 | 2018025689 | 2.80 ppb |
| 2018-11-06 | 2018031631 | 2.80 ppb |
| 2018-12-04 | 2018033624 | 2.70 ppb |
| 2019-02-05 | 2019002997 | 2.40 ppb |
| 2019-03-12 | 2019006236 | 2.60 ppb |
| 2019-05-14 | 2019013298 | 0.320 ppb |
| 2019-06-11 | 2019016197 | 0.560 ppb |
| 2019-08-07 | 2019021835 | 0.520 ppb |
| 2019-09-18 | 2019026566 | 0.580 ppb |
| 2019-11-12 | 2019032240 | 0.850 ppb |
| 2019-12-10 | 2019034888 | 0.850 ppb |