Bromodichloromethane

Dedham Westwood Water District

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

115

Samples

Samples exceeding legal limit (MCL)

107

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	1.28 ppb	6	4	ND - 5.10 ppb
2015	10.4 ppb	22	20	ND - 20.4 ppb
2016	9.81 ppb	22	20	ND - 18.1 ppb
2017	11.9 ppb	22	21	ND - 28.3 ppb
2018	13.3 ppb	21	21	0.600 ppb - 26.7 ppb
2019	9.70 ppb	22	21	ND - 19.2 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	Result
2014-01-07	5.10 ppb
2014-01-07	1.10 ppb
2014-04-08	0.800 ppb
2014-07-22	0.700 ppb
2014-07-22	ND
2014-10-22	ND
2015-01-06	11.0 ppb
2015-01-06	15.4 ppb
2015-01-06	14.8 ppb
2015-01-06	11.4 ppb
2015-03-11	4.90 ppb
2015-03-11	0.800 ppb
2015-04-07	0.600 ppb
2015-04-07	11.3 ppb
2015-04-07	12.5 ppb
2015-04-07	13.8 ppb
2015-04-07	8.90 ppb
2015-07-07	15.4 ppb
2015-07-07	18.7 ppb
2015-07-07	14.1 ppb
2015-07-07	11.1 ppb
2015-07-28	0.600 ppb
2015-07-29	ND
2015-10-06	14.5 ppb
2015-10-06	20.4 ppb
2015-10-06	16.4 ppb
2015-10-06	12.8 ppb
2015-11-17	ND
2016-01-05	0.500 ppb
2016-01-05	6.90 ppb
2016-01-05	13.0 ppb
2016-01-05	14.8 ppb
2016-01-05	13.7 ppb
2016-01-05	9.30 ppb
2016-04-05	0.500 ppb
2016-04-05	10.5 ppb
2016-04-05	12.5 ppb
2016-04-05	13.9 ppb
2016-04-05	8.30 ppb
2016-07-06	12.9 ppb
2016-07-06	12.9 ppb
2016-07-06	11.7 ppb
2016-07-06	10.5 ppb
2016-07-12	0.700 ppb
2016-07-12	ND
2016-10-04	ND
2016-10-04	15.7 ppb
2016-10-04	18.1 ppb
2016-10-04	16.9 ppb
2016-10-04	12.6 ppb
2017-01-04	0.500 ppb
2017-01-04	5.90 ppb
2017-01-04	9.80 ppb
2017-01-04	16.2 ppb
2017-01-04	17.9 ppb
2017-01-04	9.70 ppb
2017-04-04	0.700 ppb
2017-04-04	9.80 ppb
2017-04-04	12.1 ppb
2017-04-04	12.8 ppb
2017-04-04	8.30 ppb
2017-07-06	15.8 ppb
2017-07-06	21.5 ppb
2017-07-06	15.9 ppb
2017-07-06	15.8 ppb
2017-08-04	0.700 ppb
2017-08-04	ND
2017-10-04	18.6 ppb
2017-10-04	28.3 ppb
2017-10-04	21.9 ppb
2017-10-04	19.6 ppb
2017-10-19	0.600 ppb
2018-01-09	14.3 ppb
2018-01-09	26.7 ppb
2018-01-09	26.2 ppb
2018-01-09	20.4 ppb
2018-01-24	0.800 ppb
2018-01-24	5.60 ppb
2018-04-02	0.900 ppb
2018-04-03	10.3 ppb
2018-04-03	16.0 ppb
2018-04-03	16.1 ppb
2018-04-03	8.60 ppb
2018-07-03	10.1 ppb
2018-07-03	22.9 ppb
2018-07-03	15.1 ppb
2018-07-03	10.5 ppb
2018-07-11	0.600 ppb
2018-10-03	20.0 ppb
2018-10-03	20.9 ppb
2018-10-03	18.5 ppb
2018-10-03	14.4 ppb
2018-10-26	0.900 ppb
2019-01-04	10.1 ppb
2019-01-04	18.1 ppb
2019-01-04	15.8 ppb
2019-01-04	11.0 ppb
2019-01-30	0.800 ppb
2019-01-30	10.5 ppb
2019-04-02	11.1 ppb
2019-04-02	18.0 ppb
2019-04-02	17.6 ppb
2019-04-02	13.0 ppb
2019-05-16	0.800 ppb
2019-07-01	19.2 ppb
2019-07-01	11.7 ppb
2019-07-01	11.2 ppb
2019-07-01	8.60 ppb
2019-08-28	0.800 ppb
2019-08-28	ND
2019-10-01	14.5 ppb
2019-10-01	8.20 ppb
2019-10-01	7.60 ppb
2019-10-01	3.60 ppb
2019-10-23	1.10 ppb