Dibromochloromethane
Roswell Municipal Water System
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.
94
Samples
0
Samples exceeding legal limit (MCL)
94
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 | 0.893 ppb | 16 | 16 | 0.290 ppb - 2.40 ppb |
| 2015 | 1.31 ppb | 16 | 16 | 0.550 ppb - 4.20 ppb |
| 2016 | 1.13 ppb | 16 | 16 | 0.300 ppb - 2.90 ppb |
| 2017 | 1.06 ppb | 16 | 16 | 0.370 ppb - 2.10 ppb |
| 2018 | 0.888 ppb | 14 | 14 | 0.460 ppb - 1.50 ppb |
| 2019 | 1.00 ppb | 16 | 16 | 0.390 ppb - 2.50 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 |
|---|---|---|
| 2014-02-19 | 2014005814 | 0.660 ppb |
| 2014-02-19 | 2014005815 | 0.580 ppb |
| 2014-02-19 | 2014005813 | 0.290 ppb |
| 2014-02-19 | 2014005812 | 2.40 ppb |
| 2014-04-22 | 2014013875 | 1.10 ppb |
| 2014-04-22 | 2014013874 | 1.10 ppb |
| 2014-04-22 | 2014013876 | 0.620 ppb |
| 2014-04-22 | 2014013877 | 0.520 ppb |
| 2014-07-24 | 2014023528 | 0.450 ppb |
| 2014-07-24 | 2014023527 | 0.600 ppb |
| 2014-07-24 | 2014023525 | 0.640 ppb |
| 2014-07-24 | 2014023526 | 1.10 ppb |
| 2014-10-22 | 2014033288 | 1.40 ppb |
| 2014-10-22 | 2014033286 | 1.20 ppb |
| 2014-10-22 | 2014033287 | 1.000 ppb |
| 2014-10-22 | 2014033285 | 0.620 ppb |
| 2015-01-20 | 2015002205 | 1.50 ppb |
| 2015-01-20 | 2015002206 | 1.10 ppb |
| 2015-01-20 | 2015002208 | 0.870 ppb |
| 2015-01-20 | 2015002207 | 0.640 ppb |
| 2015-04-14 | 2015011525 | 0.550 ppb |
| 2015-04-14 | 2015011526 | 0.770 ppb |
| 2015-04-14 | 2015011524 | 0.950 ppb |
| 2015-04-14 | 2015011523 | 2.50 ppb |
| 2015-07-14 | 2015020439 | 0.970 ppb |
| 2015-07-14 | 2015020440 | 0.790 ppb |
| 2015-07-14 | 2015020438 | 0.780 ppb |
| 2015-07-14 | 2015020441 | 1.30 ppb |
| 2015-10-27 | 2015032263 | 4.20 ppb |
| 2015-10-27 | 2015032264 | 2.10 ppb |
| 2015-10-27 | 2015032262 | 0.990 ppb |
| 2015-10-27 | 2015032261 | 0.870 ppb |
| 2016-01-26 | 2016002557 | 0.990 ppb |
| 2016-01-26 | 2016002556 | 0.990 ppb |
| 2016-01-26 | 2016002558 | 1.40 ppb |
| 2016-01-27 | 2016002555 | 2.90 ppb |
| 2016-04-20 | 2016011291 | 1.80 ppb |
| 2016-04-20 | 2016011289 | 1.10 ppb |
| 2016-04-20 | 2016011290 | 0.750 ppb |
| 2016-04-20 | 2016011292 | 0.300 ppb |
| 2016-07-25 | 2016021228 | 1.40 ppb |
| 2016-07-25 | 2016021227 | 1.20 ppb |
| 2016-07-25 | 2016021230 | 0.820 ppb |
| 2016-07-25 | 2016021229 | 0.310 ppb |
| 2016-10-17 | 2016030144 | 1.10 ppb |
| 2016-10-17 | 2016030145 | 0.440 ppb |
| 2016-10-17 | 2016030146 | 1.40 ppb |
| 2016-10-17 | 2016030143 | 1.20 ppb |
| 2017-01-17 | 2017001368 | 2.10 ppb |
| 2017-01-17 | 2017001366 | 1.70 ppb |
| 2017-01-17 | 2017001367 | 0.940 ppb |
| 2017-01-17 | 2017001369 | 0.680 ppb |
| 2017-04-17 | 2017011269 | 1.60 ppb |
| 2017-04-17 | 2017011268 | 1.50 ppb |
| 2017-04-17 | 2017011267 | 1.20 ppb |
| 2017-04-17 | 2017011270 | 0.800 ppb |
| 2017-07-25 | 2017021565 | 1.40 ppb |
| 2017-07-25 | 2017021564 | 0.370 ppb |
| 2017-07-25 | 2017021567 | 0.760 ppb |
| 2017-07-25 | 2017021566 | 1.000 ppb |
| 2017-10-26 | 2017030970 | 1.20 ppb |
| 2017-10-26 | 2017030968 | 0.750 ppb |
| 2017-10-26 | 2017030971 | 0.490 ppb |
| 2017-10-26 | 2017030969 | 0.410 ppb |
| 2018-01-18 | 2018001892 | 0.980 ppb |
| 2018-01-18 | 2018001891 | 1.50 ppb |
| 2018-01-18 | 2018001890 | 0.650 ppb |
| 2018-04-05 | 2018009845 | 0.530 ppb |
| 2018-04-05 | 2018009844 | 0.980 ppb |
| 2018-04-05 | 2018009843 | 0.700 ppb |
| 2018-07-02 | 2018018267 | 0.980 ppb |
| 2018-07-02 | 2018018266 | 0.990 ppb |
| 2018-07-02 | 2018018265 | 0.460 ppb |
| 2018-07-02 | 2018018268 | 0.510 ppb |
| 2018-10-09 | 2018028897 | 0.950 ppb |
| 2018-10-09 | 2018028898 | 0.600 ppb |
| 2018-10-09 | 2018028899 | 1.50 ppb |
| 2018-10-09 | 2018028900 | 1.10 ppb |
| 2019-01-09 | 2019000681 | 0.920 ppb |
| 2019-01-09 | 2019000682 | 1.10 ppb |
| 2019-01-09 | 2019000683 | 0.770 ppb |
| 2019-01-09 | 2019000684 | 1.20 ppb |
| 2019-04-02 | 2019008479 | 2.00 ppb |
| 2019-04-02 | 2019008480 | 0.390 ppb |
| 2019-04-02 | 2019008481 | 0.780 ppb |
| 2019-04-02 | 2019008478 | 1.20 ppb |
| 2019-07-09 | 2019018727 | 0.470 ppb |
| 2019-07-09 | 2019018730 | 1.10 ppb |
| 2019-07-09 | 2019018729 | 0.620 ppb |
| 2019-07-09 | 2019018728 | 2.50 ppb |
| 2019-10-03 | 2019028342 | 1.30 ppb |
| 2019-10-03 | 2019028341 | 0.620 ppb |
| 2019-10-03 | 2019028340 | 0.680 ppb |
| 2019-10-03 | 2019028339 | 0.410 ppb |