Bromodichloromethane

Shiloh Waterworks 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

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	2.18 ppb	4	2	ND - 4.35 ppb
2015	0.620 ppb	4	2	ND - 1.24 ppb
2016	2.51 ppb	4	4	2.06 ppb - 2.95 ppb
2017	ND	4	0	ND
2018	ND	4	0	ND
2019	3.55 ppb	4	4	3.00 ppb - 4.10 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
2014-08-08	1324664	ND
2014-08-08	1324663	4.35 ppb
2014-08-08	1324664	ND
2014-08-08	1324663	4.35 ppb
2015-08-10	1418292	1.24 ppb
2015-08-10	1418292	1.24 ppb
2015-08-10	1418295	ND
2015-08-10	1418295	ND
2016-08-08	1514245	2.06 ppb
2016-08-08	1514246	2.95 ppb
2016-08-08	1514246	2.95 ppb
2016-08-08	1514245	2.06 ppb
2017-08-17	35331378050	ND
2017-08-17	35331378050	ND
2017-08-17	35331378049	ND
2017-08-17	35331378049	ND
2018-08-28	35414243002	ND
2018-08-28	35414243001	ND
2018-08-28	35414243001	ND
2018-08-28	35414243002	ND
2019-08-26	35494455001	3.00 ppb
2019-08-26	35494455002	4.10 ppb
2019-08-26	35494455001	3.00 ppb
2019-08-26	35494455002	4.10 ppb