Bromodichloromethane

Verona 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	0.122 ppb	9	1	ND - 1.10 ppb
2015	0.800 ppb	2	1	ND - 1.60 ppb
2016	1.20 ppb	2	1	ND - 2.40 ppb
2017	0.300 ppb	6	1	ND - 1.80 ppb
2018	2.10 ppb	1	1	2.10 ppb
2019	2.30 ppb	1	1	2.30 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
2014-03-17	123462001	ND
2014-06-10	138119001	ND
2014-08-20	152641001	1.10 ppb
2014-09-24	159456001	ND
2014-09-24	159458001	ND
2014-09-24	159453001	ND
2014-09-24	159451001	ND
2014-10-07	162051001	ND
2014-12-08	171343001	ND
2015-08-17	211952001	1.60 ppb
2015-08-17	211954001	ND
2016-08-23	273571001	ND
2016-08-23	273555001	2.40 ppb
2017-08-28	338309001	ND
2017-08-28	338312001	ND
2017-08-28	338307001	ND
2017-08-28	338306001	ND
2017-08-28	338311001	ND
2017-08-29	338627001	1.80 ppb
2018-08-29	404005001	2.10 ppb
2019-08-27	466100001	2.30 ppb