Bromodichloromethane

Rison Waterworks

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.

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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	ND	5	0	ND
2015	ND	2	0	ND
2016	0.913 ppb	7	4	ND - 3.09 ppb
2017	ND	2	0	ND
2018	0.280 ppb	2	1	ND - 0.560 ppb
2019	1.08 ppb	3	3	0.640 ppb - 1.80 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
2014-02-05	14037002909	ND
2014-05-05	14128006609	ND
2014-05-21	14142003902	ND
2014-05-21	14142003802	ND
2014-11-19	14324008001	ND
2015-05-04	15127010802	ND
2015-12-01	15337001701	ND
2016-01-25	16028003201	ND
2016-04-25	16119004101	ND
2016-05-02	16126015701	0.730 ppb
2016-06-13	16168005502	ND
2016-09-12	16259004101	0.860 ppb
2016-10-17	16294003301	3.09 ppb
2016-10-17	16294003401	1.71 ppb
2017-06-27	17179000902	ND
2017-10-04	17278011402	ND
2018-06-26	18179001202	ND
2018-10-23	18298000501	0.560 ppb
2019-08-05	19220004202	1.80 ppb
2019-10-22	19297000301	0.790 ppb
2019-10-22	19297000201	0.640 ppb