Bromodichloromethane
University of New Mexico
Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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 | 0.658 ppb | 4 | 4 | 0.270 ppb - 1.30 ppb |
| 2015 | 0.599 ppb | 7 | 6 | ND - 1.10 ppb |
| 2016 | 1.81 ppb | 16 | 16 | 0.150 ppb - 8.00 ppb |
| 2017 | 0.843 ppb | 16 | 16 | 0.200 ppb - 1.90 ppb |
| 2018 | 0.481 ppb | 12 | 11 | ND - 1.000 ppb |
| 2019 | 0.416 ppb | 16 | 13 | ND - 0.970 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.06 ppb
The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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 |
|---|---|---|
| 2014-01-17 | 2014001715 | 1.30 ppb |
| 2014-04-15 | 2014012256 | 0.270 ppb |
| 2014-07-15 | 2014022282 | 0.320 ppb |
| 2014-10-16 | 2014032609 | 0.740 ppb |
| 2015-01-13 | 2015001371 | 0.810 ppb |
| 2015-04-13 | 2015011311 | ND |
| 2015-07-13 | 2015020012 | 1.10 ppb |
| 2015-10-13 | 2015030755 | 0.710 ppb |
| 2015-10-13 | 2015030758 | 0.260 ppb |
| 2015-10-13 | 2015030757 | 0.390 ppb |
| 2015-10-13 | 2015030756 | 0.920 ppb |
| 2016-01-11 | 2016000871 | 8.00 ppb |
| 2016-01-11 | 2016000873 | 6.80 ppb |
| 2016-01-11 | 2016000874 | 6.30 ppb |
| 2016-01-11 | 2016000872 | 2.30 ppb |
| 2016-04-19 | 2016011059 | 0.280 ppb |
| 2016-04-19 | 2016011058 | 0.480 ppb |
| 2016-04-19 | 2016011057 | 0.620 ppb |
| 2016-04-19 | 2016011060 | 1.000 ppb |
| 2016-07-13 | 2016020056 | 0.360 ppb |
| 2016-07-13 | 2016020057 | 0.280 ppb |
| 2016-07-13 | 2016020055 | 0.150 ppb |
| 2016-07-13 | 2016020058 | 0.690 ppb |
| 2016-10-17 | 2016030075 | 0.760 ppb |
| 2016-10-17 | 2016030076 | 0.530 ppb |
| 2016-10-17 | 2016030073 | 0.250 ppb |
| 2016-10-17 | 2016030074 | 0.170 ppb |
| 2017-01-10 | 2017000734 | 1.20 ppb |
| 2017-01-10 | 2017000735 | 0.470 ppb |
| 2017-01-10 | 2017000736 | 0.640 ppb |
| 2017-01-10 | 2017000733 | 1.10 ppb |
| 2017-04-05 | 2017009776 | 1.90 ppb |
| 2017-04-05 | 2017009777 | 0.750 ppb |
| 2017-04-05 | 2017009779 | 0.400 ppb |
| 2017-04-05 | 2017009778 | 0.240 ppb |
| 2017-07-11 | 2017019663 | 0.200 ppb |
| 2017-07-11 | 2017019664 | 1.90 ppb |
| 2017-07-11 | 2017019662 | 0.770 ppb |
| 2017-07-11 | 2017019661 | 0.750 ppb |
| 2017-10-10 | 2017029146 | 1.40 ppb |
| 2017-10-10 | 2017029144 | 0.720 ppb |
| 2017-10-10 | 2017029143 | 0.690 ppb |
| 2017-10-10 | 2017029145 | 0.350 ppb |
| 2018-04-04 | 2018009641 | 0.910 ppb |
| 2018-04-04 | 2018009640 | 0.560 ppb |
| 2018-04-04 | 2018009639 | 0.430 ppb |
| 2018-04-04 | 2018009638 | 0.290 ppb |
| 2018-07-09 | 2018018568 | 1.000 ppb |
| 2018-07-09 | 2018018565 | 0.280 ppb |
| 2018-07-09 | 2018018566 | 0.620 ppb |
| 2018-07-09 | 2018018567 | 0.180 ppb |
| 2018-10-01 | 2018028078 | 0.950 ppb |
| 2018-10-01 | 2018028079 | 0.320 ppb |
| 2018-10-01 | 2018028080 | 0.230 ppb |
| 2018-10-01 | 2018028081 | ND |
| 2019-01-10 | 2019000766 | 0.970 ppb |
| 2019-01-10 | 2019000767 | 0.380 ppb |
| 2019-01-10 | 2019000768 | 0.620 ppb |
| 2019-01-10 | 2019000769 | 0.580 ppb |
| 2019-04-04 | 2019008474 | 0.440 ppb |
| 2019-04-04 | 2019008475 | 0.830 ppb |
| 2019-04-04 | 2019008476 | 0.520 ppb |
| 2019-04-04 | 2019008477 | 0.420 ppb |
| 2019-07-02 | 2019018102 | ND |
| 2019-07-02 | 2019018104 | 0.190 ppb |
| 2019-07-02 | 2019018103 | 0.330 ppb |
| 2019-07-02 | 2019018101 | 0.210 ppb |
| 2019-10-02 | 2019028147 | ND |
| 2019-10-02 | 2019028146 | ND |
| 2019-10-02 | 2019028145 | 0.670 ppb |
| 2019-10-02 | 2019028144 | 0.490 ppb |