Bromodichloromethane
Rehoboth District
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 | 0.647 ppb | 20 | 12 | ND - 2.19 ppb |
| 2015 | 0.471 ppb | 23 | 10 | ND - 1.89 ppb |
| 2016 | 0.587 ppb | 18 | 12 | ND - 1.55 ppb |
| 2017 | 0.687 ppb | 18 | 13 | ND - 2.15 ppb |
| 2018 | 0.767 ppb | 20 | 11 | ND - 2.47 ppb |
| 2019 | 0.860 ppb | 20 | 14 | ND - 2.20 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 |
|---|---|---|
| 2014-03-05 | S479051 | ND |
| 2014-03-05 | S479052 | 0.560 ppb |
| 2014-03-05 | S479053 | 1.41 ppb |
| 2014-03-05 | S479054 | 1.01 ppb |
| 2014-05-15 | S479194 | ND |
| 2014-06-02 | S479123 | ND |
| 2014-06-02 | S479124 | 0.800 ppb |
| 2014-06-02 | S479125 | 0.810 ppb |
| 2014-06-02 | S479126 | 1.23 ppb |
| 2014-07-28 | L5175318-1 | ND |
| 2014-09-03 | S479191 | 0.940 ppb |
| 2014-09-03 | S479192 | 1.35 ppb |
| 2014-09-03 | S536964 | 0.610 ppb |
| 2014-09-03 | S536965 | 2.19 ppb |
| 2014-10-15 | S257741 | ND |
| 2014-10-21 | S251486 | ND |
| 2014-12-01 | S316446 | ND |
| 2014-12-01 | S316447 | ND |
| 2014-12-01 | S316448 | 0.840 ppb |
| 2014-12-01 | S316449 | 1.18 ppb |
| 2015-01-14 | S504599 | ND |
| 2015-03-02 | S580502 | ND |
| 2015-03-02 | S580503 | ND |
| 2015-03-02 | S580504 | 0.710 ppb |
| 2015-03-02 | S580505 | 0.670 ppb |
| 2015-05-27 | S612405 | ND |
| 2015-06-01 | S612414 | ND |
| 2015-06-01 | S612415 | ND |
| 2015-06-01 | S612416 | 1.58 ppb |
| 2015-06-01 | S612417 | 1.21 ppb |
| 2015-08-10 | S590347 | ND |
| 2015-08-26 | S602019 | ND |
| 2015-09-09 | S602035 | ND |
| 2015-09-09 | S602036 | 1.89 ppb |
| 2015-09-09 | S602037 | 0.760 ppb |
| 2015-09-09 | S602038 | 1.40 ppb |
| 2015-10-20 | S614746 | ND |
| 2015-10-20 | S614747 | ND |
| 2015-11-05 | S624991 | ND |
| 2015-12-07 | S625009 | 0.940 ppb |
| 2015-12-07 | S625010 | 0.840 ppb |
| 2015-12-07 | S625011 | ND |
| 2015-12-07 | S625012 | 0.830 ppb |
| 2016-03-07 | S602103 | 0.770 ppb |
| 2016-03-07 | S602104 | 0.560 ppb |
| 2016-03-07 | S602105 | ND |
| 2016-03-07 | S602106 | ND |
| 2016-04-11 | S73229 | ND |
| 2016-04-11 | S73230 | ND |
| 2016-06-06 | S629046 | ND |
| 2016-06-06 | S629047 | 0.770 ppb |
| 2016-06-06 | S629048 | 0.980 ppb |
| 2016-06-06 | S629049 | 0.630 ppb |
| 2016-09-07 | S670379 | 1.55 ppb |
| 2016-09-07 | S670380 | 1.20 ppb |
| 2016-09-07 | S670381 | 0.650 ppb |
| 2016-09-07 | S670382 | 1.31 ppb |
| 2016-12-05 | S670400 | 0.880 ppb |
| 2016-12-05 | S670401 | 0.600 ppb |
| 2016-12-05 | S670402 | ND |
| 2016-12-05 | S670403 | 0.660 ppb |
| 2017-01-24 | S670498 | ND |
| 2017-03-06 | S679363 | ND |
| 2017-03-06 | S679364 | 0.510 ppb |
| 2017-03-06 | S679365 | ND |
| 2017-03-06 | S679366 | 0.620 ppb |
| 2017-06-06 | S730806 | 1.07 ppb |
| 2017-06-06 | S730807 | 0.800 ppb |
| 2017-06-06 | S730808 | 0.570 ppb |
| 2017-06-06 | S730809 | 0.540 ppb |
| 2017-07-31 | S679387 | ND |
| 2017-09-05 | S737137 | 2.15 ppb |
| 2017-09-05 | S737141 | 1.51 ppb |
| 2017-09-05 | S737145 | 0.870 ppb |
| 2017-09-05 | S737149 | 1.19 ppb |
| 2017-12-04 | S659090 | 0.780 ppb |
| 2017-12-04 | S670396 | 0.730 ppb |
| 2017-12-04 | S679375 | ND |
| 2017-12-04 | S679379 | 1.02 ppb |
| 2018-01-24 | S730853 | ND |
| 2018-03-06 | S770612 | 0.660 ppb |
| 2018-03-06 | S770616 | 0.530 ppb |
| 2018-03-06 | S770620 | ND |
| 2018-03-06 | S770624 | 2.47 ppb |
| 2018-06-04 | S770754 | ND |
| 2018-06-04 | S770806 | ND |
| 2018-06-04 | S770833 | 0.600 ppb |
| 2018-06-20 | S770575 | 1.000 ppb |
| 2018-09-05 | S812289 | 1.87 ppb |
| 2018-09-05 | S812293 | 1.90 ppb |
| 2018-09-05 | S812297 | ND |
| 2018-09-05 | S812301 | 1.54 ppb |
| 2018-09-10 | S812241 | ND |
| 2018-11-09 | S812575 | ND |
| 2018-11-09 | S812577 | ND |
| 2018-12-05 | S817013 | ND |
| 2018-12-05 | S817017 | 1.74 ppb |
| 2018-12-05 | S817021 | 2.11 ppb |
| 2018-12-05 | S817029 | 0.910 ppb |
| 2019-03-04 | S847933 | 0.850 ppb |
| 2019-03-04 | S847937 | 1.01 ppb |
| 2019-03-04 | S847941 | ND |
| 2019-03-04 | S847945 | 1.22 ppb |
| 2019-04-29 | S847993 | ND |
| 2019-04-29 | S847995 | 2.20 ppb |
| 2019-05-28 | S848014 | 1.56 ppb |
| 2019-05-28 | S848015 | ND |
| 2019-06-03 | S848059 | 1.80 ppb |
| 2019-06-03 | S848063 | 0.980 ppb |
| 2019-06-03 | S848067 | ND |
| 2019-06-03 | S848071 | 1.14 ppb |
| 2019-09-03 | S864697 | 1.57 ppb |
| 2019-09-03 | S864701 | 1.03 ppb |
| 2019-09-03 | S864705 | ND |
| 2019-09-03 | S864709 | 0.590 ppb |
| 2019-12-03 | S919907 | 0.910 ppb |
| 2019-12-03 | S919911 | 0.880 ppb |
| 2019-12-03 | S919915 | ND |
| 2019-12-03 | S919919 | 1.46 ppb |