Dibromochloromethane
Rehoboth District
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.
119
Samples
0
Samples exceeding legal limit (MCL)
96
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 1.02 ppb | 20 | 15 | ND - 3.05 ppb |
| 2015 | 0.827 ppb | 23 | 15 | ND - 2.46 ppb |
| 2016 | 1.01 ppb | 18 | 16 | ND - 1.96 ppb |
| 2017 | 1.37 ppb | 18 | 17 | ND - 3.99 ppb |
| 2018 | 1.32 ppb | 20 | 15 | ND - 3.98 ppb |
| 2019 | 1.36 ppb | 20 | 18 | ND - 2.86 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 |
|---|---|---|
| 2014-03-05 | S479051 | 0.960 ppb |
| 2014-03-05 | S479052 | 0.780 ppb |
| 2014-03-05 | S479053 | 1.97 ppb |
| 2014-03-05 | S479054 | 1.34 ppb |
| 2014-05-15 | S479194 | ND |
| 2014-06-02 | S479123 | 0.710 ppb |
| 2014-06-02 | S479124 | 1.42 ppb |
| 2014-06-02 | S479125 | 1.29 ppb |
| 2014-06-02 | S479126 | 1.80 ppb |
| 2014-07-28 | L5175318-1 | ND |
| 2014-09-03 | S479191 | 1.63 ppb |
| 2014-09-03 | S479192 | 1.79 ppb |
| 2014-09-03 | S536964 | 0.900 ppb |
| 2014-09-03 | S536965 | 3.05 ppb |
| 2014-10-15 | S257741 | ND |
| 2014-10-21 | S251486 | ND |
| 2014-12-01 | S316446 | 0.560 ppb |
| 2014-12-01 | S316447 | 0.730 ppb |
| 2014-12-01 | S316448 | ND |
| 2014-12-01 | S316449 | 1.55 ppb |
| 2015-01-14 | S504599 | ND |
| 2015-03-02 | S580502 | ND |
| 2015-03-02 | S580503 | 0.650 ppb |
| 2015-03-02 | S580504 | 1.25 ppb |
| 2015-03-02 | S580505 | 1.07 ppb |
| 2015-05-27 | S612405 | ND |
| 2015-06-01 | S612414 | 0.720 ppb |
| 2015-06-01 | S612415 | 0.700 ppb |
| 2015-06-01 | S612416 | 2.17 ppb |
| 2015-06-01 | S612417 | 1.79 ppb |
| 2015-08-10 | S590347 | ND |
| 2015-08-26 | S602019 | ND |
| 2015-09-09 | S602035 | 0.690 ppb |
| 2015-09-09 | S602036 | 2.46 ppb |
| 2015-09-09 | S602037 | 1.12 ppb |
| 2015-09-09 | S602038 | 1.75 ppb |
| 2015-10-20 | S614746 | ND |
| 2015-10-20 | S614747 | ND |
| 2015-11-05 | S624991 | ND |
| 2015-12-07 | S625009 | 1.25 ppb |
| 2015-12-07 | S625010 | 1.11 ppb |
| 2015-12-07 | S625011 | 0.580 ppb |
| 2015-12-07 | S625012 | 1.72 ppb |
| 2016-03-07 | S602103 | 1.04 ppb |
| 2016-03-07 | S602104 | 0.800 ppb |
| 2016-03-07 | S602105 | 0.500 ppb |
| 2016-03-07 | S602106 | 1.12 ppb |
| 2016-04-11 | S73229 | ND |
| 2016-04-11 | S73230 | ND |
| 2016-06-06 | S629046 | 0.660 ppb |
| 2016-06-06 | S629047 | 1.14 ppb |
| 2016-06-06 | S629048 | 1.49 ppb |
| 2016-06-06 | S629049 | 1.31 ppb |
| 2016-09-07 | S670379 | 1.96 ppb |
| 2016-09-07 | S670380 | 1.46 ppb |
| 2016-09-07 | S670381 | 0.860 ppb |
| 2016-09-07 | S670382 | 1.67 ppb |
| 2016-12-05 | S670400 | 1.32 ppb |
| 2016-12-05 | S670401 | 0.940 ppb |
| 2016-12-05 | S670402 | 0.530 ppb |
| 2016-12-05 | S670403 | 1.44 ppb |
| 2017-01-24 | S670498 | 0.680 ppb |
| 2017-03-06 | S679363 | 0.670 ppb |
| 2017-03-06 | S679364 | 0.850 ppb |
| 2017-03-06 | S679365 | 0.630 ppb |
| 2017-03-06 | S679366 | 1.39 ppb |
| 2017-06-06 | S730806 | 1.85 ppb |
| 2017-06-06 | S730807 | 1.25 ppb |
| 2017-06-06 | S730808 | 1.20 ppb |
| 2017-06-06 | S730809 | 1.28 ppb |
| 2017-07-31 | S679387 | ND |
| 2017-09-05 | S737137 | 3.99 ppb |
| 2017-09-05 | S737141 | 2.82 ppb |
| 2017-09-05 | S737145 | 1.63 ppb |
| 2017-09-05 | S737149 | 2.39 ppb |
| 2017-12-04 | S659090 | 0.980 ppb |
| 2017-12-04 | S670396 | 1.06 ppb |
| 2017-12-04 | S679375 | 0.700 ppb |
| 2017-12-04 | S679379 | 1.28 ppb |
| 2018-01-24 | S730853 | ND |
| 2018-03-06 | S770612 | 0.900 ppb |
| 2018-03-06 | S770616 | 0.810 ppb |
| 2018-03-06 | S770620 | ND |
| 2018-03-06 | S770624 | 1.92 ppb |
| 2018-06-04 | S770754 | 1.000 ppb |
| 2018-06-04 | S770806 | 0.700 ppb |
| 2018-06-04 | S770833 | 1.46 ppb |
| 2018-06-20 | S770575 | 1.71 ppb |
| 2018-09-05 | S812289 | 3.98 ppb |
| 2018-09-05 | S812293 | 3.46 ppb |
| 2018-09-05 | S812297 | 0.980 ppb |
| 2018-09-05 | S812301 | 2.52 ppb |
| 2018-09-10 | S812241 | ND |
| 2018-11-09 | S812575 | ND |
| 2018-11-09 | S812577 | ND |
| 2018-12-05 | S817013 | 0.580 ppb |
| 2018-12-05 | S817017 | 2.68 ppb |
| 2018-12-05 | S817021 | 2.46 ppb |
| 2018-12-05 | S817029 | 1.28 ppb |
| 2019-03-04 | S847933 | 1.24 ppb |
| 2019-03-04 | S847937 | 1.34 ppb |
| 2019-03-04 | S847941 | 0.540 ppb |
| 2019-03-04 | S847945 | 1.68 ppb |
| 2019-04-29 | S847993 | ND |
| 2019-04-29 | S847995 | 2.86 ppb |
| 2019-05-28 | S848014 | 1.55 ppb |
| 2019-05-28 | S848015 | ND |
| 2019-06-03 | S848059 | 2.61 ppb |
| 2019-06-03 | S848063 | 1.77 ppb |
| 2019-06-03 | S848067 | 1.02 ppb |
| 2019-06-03 | S848071 | 2.04 ppb |
| 2019-09-03 | S864697 | 2.17 ppb |
| 2019-09-03 | S864701 | 1.69 ppb |
| 2019-09-03 | S864705 | 0.790 ppb |
| 2019-09-03 | S864709 | 0.840 ppb |
| 2019-12-03 | S919907 | 1.27 ppb |
| 2019-12-03 | S919911 | 1.25 ppb |
| 2019-12-03 | S919915 | 0.670 ppb |
| 2019-12-03 | S919919 | 1.87 ppb |