Dibromochloromethane
Sherwood Waterworks
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 | 0.324 ppb | 7 | 6 | ND - 0.520 ppb |
| 2015 | 0.306 ppb | 8 | 5 | ND - 0.810 ppb |
| 2016 | 0.268 ppb | 8 | 5 | ND - 0.610 ppb |
| 2017 | 0.260 ppb | 4 | 2 | ND - 0.530 ppb |
| 2018 | 0.133 ppb | 4 | 1 | ND - 0.530 ppb |
| 2019 | 0.153 ppb | 4 | 1 | ND - 0.610 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 |
|---|---|---|
| 2014-01-14 | 766569 | 0.170 ppb |
| 2014-01-14 | 766571 | 0.260 ppb |
| 2014-04-15 | 780875 | ND |
| 2014-07-14 | 803546 | 0.510 ppb |
| 2014-07-14 | 803544 | 0.520 ppb |
| 2014-10-14 | 825961 | 0.360 ppb |
| 2014-10-14 | 825962 | 0.450 ppb |
| 2015-01-14 | 839128 | ND |
| 2015-01-14 | 839130 | ND |
| 2015-04-14 | 854114 | ND |
| 2015-04-14 | 854116 | 0.400 ppb |
| 2015-07-15 | 871157 | 0.600 ppb |
| 2015-07-15 | 871159 | 0.810 ppb |
| 2015-10-13 | 888656 | 0.290 ppb |
| 2015-10-13 | 888654 | 0.350 ppb |
| 2016-01-19 | 902074 | ND |
| 2016-01-19 | 902075 | ND |
| 2016-04-19 | 916435 | ND |
| 2016-04-19 | 916368 | 0.410 ppb |
| 2016-07-12 | 933136 | 0.470 ppb |
| 2016-07-12 | 933138 | 0.610 ppb |
| 2016-10-11 | 953073 | 0.250 ppb |
| 2016-10-11 | 953071 | 0.400 ppb |
| 2017-01-16 | 970434 | ND |
| 2017-04-18 | 983978 | 0.510 ppb |
| 2017-07-17 | 1005455 | 0.530 ppb |
| 2017-10-16 | 1025088 | ND |
| 2018-01-16 | 1037476 | ND |
| 2018-04-17 | 1050765 | ND |
| 2018-07-17 | 1067890 | 0.530 ppb |
| 2018-10-16 | 1087722 | ND |
| 2019-01-15 | 1101684 | ND |
| 2019-04-15 | 1116127 | ND |
| 2019-07-16 | 1135235 | 0.610 ppb |
| 2019-10-15 | 1155556 | ND |