Dibromochloromethane
City of Trinidad
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | N/A | 0 | 0 | N/A |
2015 | ND | 1 | 0 | ND |
2016 | 0.793 ppb | 8 | 8 | 0.610 ppb - 0.970 ppb |
2017 | 0.749 ppb | 9 | 8 | ND - 1.20 ppb |
2018 | 0.714 ppb | 9 | 8 | ND - 0.990 ppb |
2019 | 0.731 ppb | 9 | 8 | ND - 1.20 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 | Result |
---|---|
2015-07-13 | ND |
2016-02-08 | 0.720 ppb |
2016-02-08 | 0.820 ppb |
2016-05-09 | 0.610 ppb |
2016-05-09 | 0.710 ppb |
2016-08-15 | 0.760 ppb |
2016-08-15 | 0.920 ppb |
2016-11-14 | 0.830 ppb |
2016-11-14 | 0.970 ppb |
2017-02-06 | 0.770 ppb |
2017-02-06 | 0.670 ppb |
2017-05-08 | 0.810 ppb |
2017-05-08 | 1.000 ppb |
2017-07-10 | ND |
2017-08-14 | 0.930 ppb |
2017-08-14 | 1.20 ppb |
2017-11-06 | 0.630 ppb |
2017-11-06 | 0.730 ppb |
2018-02-05 | 0.650 ppb |
2018-02-05 | 0.670 ppb |
2018-05-07 | 0.740 ppb |
2018-05-07 | 0.770 ppb |
2018-07-09 | ND |
2018-08-06 | 0.810 ppb |
2018-08-06 | 0.990 ppb |
2018-11-05 | 0.810 ppb |
2018-11-05 | 0.990 ppb |
2019-02-04 | 0.660 ppb |
2019-02-04 | 0.790 ppb |
2019-05-06 | 0.750 ppb |
2019-05-06 | 0.900 ppb |
2019-06-24 | ND |
2019-08-05 | 1.20 ppb |
2019-08-05 | 1.10 ppb |
2019-11-04 | 0.530 ppb |
2019-11-04 | 0.650 ppb |