Dibromochloromethane
Ashland Water Utility
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 |
|---|---|---|---|---|
| 2014 | 0.327 ppb | 9 | 5 | ND - 0.820 ppb |
| 2015 | 0.483 ppb | 9 | 9 | 0.350 ppb - 0.770 ppb |
| 2016 | 0.424 ppb | 8 | 8 | 0.190 ppb - 0.690 ppb |
| 2017 | 0.277 ppb | 9 | 7 | ND - 0.530 ppb |
| 2018 | 0.120 ppb | 8 | 2 | ND - 0.490 ppb |
| 2019 | 0.234 ppb | 9 | 4 | ND - 0.900 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 |
|---|---|---|
| 2014-02-12 | 770328 | 0.640 ppb |
| 2014-03-24 | 776497 | 0.820 ppb |
| 2014-05-20 | 790968 | ND |
| 2014-05-20 | 790969 | ND |
| 2014-08-12 | 809935 | 0.590 ppb |
| 2014-08-12 | 809936 | 0.640 ppb |
| 2014-08-13 | 810307 | 0.250 ppb |
| 2014-11-12 | 831461 | ND |
| 2014-11-12 | 831460 | ND |
| 2015-02-09 | 842371 | 0.610 ppb |
| 2015-02-09 | 842372 | 0.770 ppb |
| 2015-03-10 | 847368 | 0.350 ppb |
| 2015-05-13 | 859761 | 0.360 ppb |
| 2015-05-13 | 859762 | 0.400 ppb |
| 2015-08-10 | 875987 | 0.490 ppb |
| 2015-08-13 | 877134 | 0.450 ppb |
| 2015-11-12 | 893938 | 0.500 ppb |
| 2015-11-12 | 893939 | 0.420 ppb |
| 2016-02-09 | 904698 | 0.410 ppb |
| 2016-02-09 | 904699 | 0.430 ppb |
| 2016-05-10 | 920405 | 0.190 ppb |
| 2016-05-10 | 920406 | 0.210 ppb |
| 2016-08-08 | 937734 | 0.410 ppb |
| 2016-08-08 | 937735 | 0.490 ppb |
| 2016-11-07 | 957648 | 0.560 ppb |
| 2016-11-07 | 957649 | 0.690 ppb |
| 2017-02-13 | 973440 | 0.530 ppb |
| 2017-02-13 | 973439 | 0.470 ppb |
| 2017-04-03 | 980850 | 0.360 ppb |
| 2017-05-10 | 987816 | 0.260 ppb |
| 2017-05-10 | 987817 | 0.300 ppb |
| 2017-08-07 | 1009199 | ND |
| 2017-08-07 | 1009198 | ND |
| 2017-11-07 | 1028573 | 0.250 ppb |
| 2017-11-07 | 1028574 | 0.320 ppb |
| 2018-02-19 | 1041609 | 0.470 ppb |
| 2018-02-19 | 1041610 | 0.490 ppb |
| 2018-05-15 | 1055698 | ND |
| 2018-05-15 | 1055697 | ND |
| 2018-08-08 | 1072538 | ND |
| 2018-08-08 | 1072539 | ND |
| 2018-11-06 | 1091318 | ND |
| 2018-11-06 | 1091319 | ND |
| 2019-02-13 | 1104971 | 0.230 ppb |
| 2019-02-13 | 1104969 | 0.490 ppb |
| 2019-02-13 | 1104968 | 0.490 ppb |
| 2019-05-13 | 1120657 | ND |
| 2019-05-13 | 1120656 | ND |
| 2019-08-12 | 1140052 | ND |
| 2019-08-12 | 1140051 | 0.900 ppb |
| 2019-11-06 | 1159622 | ND |
| 2019-11-06 | 1159621 | ND |