Bromodichloromethane

Morton

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

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	0.286 ppb	12	4	ND - 1.31 ppb
2015	1.18 ppb	2	2	0.628 ppb - 1.74 ppb
2016	1.01 ppb	13	7	ND - 5.74 ppb
2017	1.06 ppb	16	8	ND - 10.8 ppb
2018	0.0310 ppb	17	1	ND - 0.527 ppb
2019	0.218 ppb	20	8	ND - 0.622 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-02-18	4022051-02	1.31 ppb
2014-02-18	4022051-03	0.759 ppb
2014-02-18	4022051-04	0.750 ppb
2014-02-18	4022051-01	ND
2014-05-19	4052630-01	ND
2014-05-19	4052630-02	ND
2014-05-19	4052630-03	ND
2014-05-19	4052630-04	ND
2014-08-12	4082110-01	ND
2014-08-12	4082110-02	ND
2014-08-12	4082110-03	0.606 ppb
2014-08-12	4082110-04	ND
2015-02-09	5021078-01	0.628 ppb
2015-11-09	5111270-01	1.74 ppb
2016-02-17	6022508-01	5.74 ppb
2016-05-19	6053097-01	0.526 ppb
2016-05-19	6053097-03	ND
2016-05-19	6053097-04	ND
2016-05-19	6053097-02	0.732 ppb
2016-08-04	6080947-01	3.83 ppb
2016-08-04	6080947-03	1.12 ppb
2016-08-04	6080947-04	ND
2016-08-04	6080947-02	0.615 ppb
2016-11-07	6111097-03	ND
2016-11-07	6111097-02	ND
2016-11-07	6111097-04	ND
2016-11-07	6111097-01	0.560 ppb
2017-02-01	7020110-02	0.979 ppb
2017-02-01	7020110-04	ND
2017-02-01	7020110-03	0.806 ppb
2017-02-01	7020110-01	0.684 ppb
2017-05-30	7054898-04	10.8 ppb
2017-05-30	7054898-02	0.638 ppb
2017-05-30	7054898-01	1.44 ppb
2017-06-05	7060486-01	ND
2017-08-31	7085714-03	ND
2017-08-31	7085714-02	ND
2017-08-31	7085714-01	ND
2017-08-31	7085714-04	0.784 ppb
2017-11-15	7112830-03	ND
2017-11-15	7112830-01	ND
2017-11-15	7112830-04	ND
2017-11-15	7112830-02	0.797 ppb
2018-02-13	8021851-04	ND
2018-02-13	8021851-03	ND
2018-02-13	8021851-02	ND
2018-02-13	8021851-01	ND
2018-05-23	8054144-04	ND
2018-05-23	8054144-03	ND
2018-05-23	8054144-02	ND
2018-05-23	8054144-01	0.527 ppb
2018-08-23	8084699-03	ND
2018-08-23	8084699-02	ND
2018-08-23	8084699-01	ND
2018-08-23	8084699-04	ND
2018-11-19	8113365-05	ND
2018-11-19	8113365-01	ND
2018-11-19	8113365-02	ND
2018-11-19	8113365-03	ND
2018-11-19	8113365-04	ND
2019-02-14	9022566-01	0.622 ppb
2019-02-14	9022566-02	0.537 ppb
2019-02-14	9022566-03	0.545 ppb
2019-02-14	9022566-04	0.545 ppb
2019-02-14	9022566-05	0.503 ppb
2019-05-15	9053222-03	ND
2019-05-15	9053222-01	ND
2019-05-15	9053222-05	0.513 ppb
2019-05-15	9053222-04	0.539 ppb
2019-05-15	9053222-02	ND
2019-08-22	9084920-01	ND
2019-08-22	9084920-05	ND
2019-08-22	9084920-04	0.548 ppb
2019-08-22	9084920-03	ND
2019-08-22	9084920-02	ND
2019-11-21	9113951-05	ND
2019-11-21	9113951-04	ND
2019-11-21	9113951-03	ND
2019-11-21	9113951-02	ND
2019-11-21	9113951-01	ND