Bromodichloromethane

Monroe 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.

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	0.128 ppb	6	1	ND - 0.770 ppb
2015	0.800 ppb	3	2	ND - 1.40 ppb
2016	0.750 ppb	3	2	ND - 1.50 ppb
2017	0.207 ppb	7	2	ND - 0.990 ppb
2018	0.600 ppb	2	1	ND - 1.20 ppb
2019	0.660 ppb	2	2	0.530 ppb - 0.790 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
2014-08-20	812026	ND
2014-08-20	812032	ND
2014-08-20	812028	ND
2014-08-20	812030	ND
2014-08-20	812036	0.770 ppb
2014-08-20	812034	ND
2015-06-03	863558	ND
2015-09-01	880134	1.000 ppb
2015-09-01	880133	1.40 ppb
2016-08-16	939687	1.50 ppb
2016-08-16	939686	0.750 ppb
2016-09-13	945408	ND
2017-06-21	999452	ND
2017-06-21	999461	ND
2017-06-21	999455	ND
2017-06-21	999458	ND
2017-07-11	1003000	ND
2017-07-11	1003180	0.460 ppb
2017-07-11	1003179	0.990 ppb
2018-09-10	1079048	ND
2018-09-10	1079047	1.20 ppb
2019-08-20	1142219	0.530 ppb
2019-08-20	1142220	0.790 ppb