Bromodichloromethane

North Liberty Water Supply

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	0.325 ppb	12	5	ND - 0.900 ppb
2015	0.550 ppb	2	1	ND - 1.10 ppb
2016	1.05 ppb	2	2	0.800 ppb - 1.30 ppb
2017	ND	2	0	ND
2018	1.05 ppb	2	2	0.700 ppb - 1.40 ppb
2019	0.550 ppb	2	2	0.500 ppb - 0.600 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
2014-02-12	2034461	ND
2014-02-12	2034462	ND
2014-02-12	2034463	ND
2014-02-20	2035241	0.800 ppb
2014-05-21	2052140	ND
2014-05-21	2052141	0.800 ppb
2014-05-21	2052142	0.500 ppb
2014-05-21	2052139	0.900 ppb
2014-08-21	2074571	ND
2014-08-21	2074570	ND
2014-08-21	2074569	0.900 ppb
2014-08-21	2074568	ND
2015-08-10	OE277695	1.10 ppb
2015-08-10	OE277696	ND
2016-08-04	OE410546	1.30 ppb
2016-08-04	OE410547	0.800 ppb
2017-08-22	OE555070	ND
2017-08-22	OE555071	ND
2018-08-30	OE706644	0.700 ppb
2018-08-30	OE706645	1.40 ppb
2019-08-08	OE846980	0.600 ppb
2019-08-08	OE846981	0.500 ppb