Dibromochloromethane
Charles Town Utilities
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 0.0656 ppb | 16 | 1 | ND - 1.05 ppb |
| 2015 | 0.150 ppb | 16 | 4 | ND - 0.700 ppb |
| 2016 | 0.231 ppb | 16 | 4 | ND - 1.10 ppb |
| 2017 | 0.607 ppb | 16 | 12 | ND - 1.41 ppb |
| 2018 | 0.437 ppb | 16 | 12 | ND - 1.000 ppb |
| 2019 | 0.858 ppb | 16 | 14 | ND - 2.90 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 |
|---|---|---|
| 2014-02-11 | S2THM_21404334 | ND |
| 2014-02-11 | S2THM_21404333 | ND |
| 2014-02-11 | S2THM_21404332 | ND |
| 2014-02-11 | S2THM_21404331 | ND |
| 2014-05-13 | S2THM_21413410 | ND |
| 2014-05-13 | S2THM_21413409 | ND |
| 2014-05-13 | S2THM_21413408 | ND |
| 2014-05-13 | S2THM_21413407 | ND |
| 2014-08-14 | S2THM_21422706 | 1.05 ppb |
| 2014-08-14 | S2THM_21422705 | ND |
| 2014-08-14 | S2THM_21422707 | ND |
| 2014-08-14 | S2THM_21422708 | ND |
| 2014-11-13 | S2THM_21431835 | ND |
| 2014-11-13 | S2THM_21431834 | ND |
| 2014-11-13 | S2THM_21431833 | ND |
| 2014-11-13 | S2THM_21431832 | ND |
| 2015-02-11 | S2THM_21504316 | ND |
| 2015-02-11 | S2THM_21504315 | ND |
| 2015-02-11 | S2THM_21504314 | ND |
| 2015-02-11 | S2THM_21504313 | ND |
| 2015-05-12 | S2THM_21513332 | ND |
| 2015-05-12 | S2THM_21513333 | ND |
| 2015-05-12 | S2THM_21513335 | ND |
| 2015-05-12 | S2THM_21513334 | ND |
| 2015-08-12 | S2DBP_235440-201 | 0.600 ppb |
| 2015-08-12 | S2DBP_235439-201 | 0.600 ppb |
| 2015-08-12 | S2DBP_235438-201 | 0.700 ppb |
| 2015-08-12 | S2DBP_235437-201 | 0.500 ppb |
| 2015-11-10 | 240067-2015-DW | ND |
| 2015-11-10 | 240066-2015-DW | ND |
| 2015-11-10 | 240065-2015-DW | ND |
| 2015-11-10 | 240064-2015-DW | ND |
| 2016-02-09 | 243992-2016-DW | ND |
| 2016-02-09 | 243991-2016-DW | ND |
| 2016-02-09 | 243993-2016-DW | ND |
| 2016-02-09 | 243994-2016-DW | ND |
| 2016-05-24 | 16052798-04A | ND |
| 2016-05-24 | 16052798-03A | ND |
| 2016-05-24 | 16052798-02A | ND |
| 2016-05-24 | 16052798-01A | ND |
| 2016-08-08 | 16081300-04A | 0.700 ppb |
| 2016-08-08 | 16081300-03A | 1.10 ppb |
| 2016-08-08 | 16081300-02A | 0.900 ppb |
| 2016-08-08 | 16081300-01A | 1.000 ppb |
| 2016-11-08 | 16111182-01A | ND |
| 2016-11-08 | 16111182-04A | ND |
| 2016-11-08 | 16111182-03A | ND |
| 2016-11-08 | 16111182-02A | ND |
| 2017-02-15 | 17022194-04A | 0.330 ppb |
| 2017-02-15 | 17022194-03A | 0.380 ppb |
| 2017-02-15 | 17022194-02A | 0.390 ppb |
| 2017-02-15 | 17022194-01A | 0.350 ppb |
| 2017-05-08 | 17051238-04A | ND |
| 2017-05-08 | 17051238-03A | ND |
| 2017-05-08 | 17051238-02A | ND |
| 2017-05-08 | 17051238-01A | ND |
| 2017-08-07 | 17081305-02A | 1.25 ppb |
| 2017-08-07 | 17081305-01A | 1.32 ppb |
| 2017-08-07 | 17081305-03A | 1.33 ppb |
| 2017-08-07 | 17081305-04A | 1.18 ppb |
| 2017-11-06 | 17111125-04A | 0.540 ppb |
| 2017-11-06 | 17111125-03A | 0.590 ppb |
| 2017-11-06 | 17111125-02A | 1.41 ppb |
| 2017-11-06 | 17111125-01A | 0.640 ppb |
| 2018-02-13 | 18021960-04A | 0.540 ppb |
| 2018-02-13 | 18021960-03A | 0.500 ppb |
| 2018-02-13 | 18021960-02A | 0.400 ppb |
| 2018-02-13 | 18021960-01A | 0.530 ppb |
| 2018-05-07 | 18051270-01A | 0.290 ppb |
| 2018-05-07 | 18051270-02A | 0.370 ppb |
| 2018-05-07 | 18051270-04A | 0.380 ppb |
| 2018-05-07 | 18051270-03A | 0.340 ppb |
| 2018-08-06 | 18081432-04A | ND |
| 2018-08-06 | 18081432-03A | ND |
| 2018-08-06 | 18081432-02A | ND |
| 2018-08-06 | 18081432-01A | ND |
| 2018-11-19 | 18112739-04A | 0.860 ppb |
| 2018-11-19 | 18112739-03A | 0.850 ppb |
| 2018-11-19 | 18112739-02A | 0.930 ppb |
| 2018-11-19 | 18112739-01A | 1.000 ppb |
| 2019-02-11 | 19021406-02A | 0.670 ppb |
| 2019-02-11 | 19021406-01A | 0.990 ppb |
| 2019-02-11 | 19021406-03A | 0.670 ppb |
| 2019-02-11 | 19021406-04A | 0.560 ppb |
| 2019-05-13 | 19051896-04A | 0.510 ppb |
| 2019-05-13 | 19051896-03A | 0.550 ppb |
| 2019-05-13 | 19051896-02A | 0.860 ppb |
| 2019-05-13 | 19051896-01A | 0.590 ppb |
| 2019-08-12 | 35490706004 | ND |
| 2019-08-12 | 35490706003 | 2.00 ppb |
| 2019-08-12 | 35490706002 | ND |
| 2019-08-12 | 35490706001 | 2.90 ppb |
| 2019-11-19 | 739256001 | 0.790 ppb |
| 2019-11-19 | 739256004 | 1.000 ppb |
| 2019-11-19 | 739256003 | 0.720 ppb |
| 2019-11-19 | 739256002 | 0.910 ppb |