Bromodichloromethane

Richton Park

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
2013	N/A	0	0	N/A
2014	0.306 ppb	12	5	ND - 0.868 ppb
2015	0.792 ppb	2	2	0.631 ppb - 0.953 ppb
2016	0.597 ppb	2	2	0.564 ppb - 0.629 ppb
2017	ND	2	0	ND
2018	2.75 ppb	2	2	0.543 ppb - 4.95 ppb
2019	1.33 ppb	2	2	0.894 ppb - 1.77 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
2014-01-08	4012095-01	ND
2014-01-08	4012095-02	ND
2014-01-08	4012095-03	ND
2014-01-08	4012095-04	ND
2014-04-09	4041873-01	0.700 ppb
2014-04-09	4041873-02	ND
2014-04-09	4041873-04	0.681 ppb
2014-04-09	4041873-03	ND
2014-07-09	4071973-04	0.742 ppb
2014-07-09	4071973-03	ND
2014-07-09	4071973-02	0.682 ppb
2014-07-09	4071973-01	0.868 ppb
2015-07-08	5071730-01	0.631 ppb
2015-07-08	5071730-02	0.953 ppb
2016-07-29	6081032-01	0.564 ppb
2016-07-29	6081032-02	0.629 ppb
2017-07-31	7081015-01	ND
2017-07-31	7081015-02	ND
2018-07-31	8080156-01	0.543 ppb
2018-07-31	8080156-02	4.95 ppb
2019-07-30	9080132-01	0.894 ppb
2019-07-30	9080132-02	1.77 ppb