Bromodichloromethane

City of Bandera

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	ND	3	0	ND
2015	1.68 ppb	5	1	ND - 8.40 ppb
2016	ND	3	0	ND
2017	0.333 ppb	3	1	ND - 1.000 ppb
2018	0.217 ppb	6	1	ND - 1.30 ppb
2019	0.450 ppb	4	1	ND - 1.80 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
2014-05-01	AC52597	ND
2014-05-01	AC52591	ND
2014-05-01	AC52584	ND
2015-01-14	AC76215	8.40 ppb
2015-01-14	AC76205	ND
2015-01-14	AC76231	ND
2015-05-26	AC93267	ND
2015-05-26	AC93276	ND
2016-01-21	AD19277	ND
2016-02-08	AD22471	ND
2016-05-04	AD35367	ND
2017-05-31	AD86139	1.000 ppb
2017-06-28	AD88048	ND
2017-06-28	AD88044	ND
2018-02-15	AE14143	ND
2018-02-15	AE14111	ND
2018-05-30	AE28057	ND
2018-05-30	AE28035	1.30 ppb
2018-09-18	AE40785	ND
2018-10-31	AE45056	ND
2019-01-10	AE49323	ND
2019-01-10	AE49329	ND
2019-01-10	AE49333	ND
2019-07-09	AE73679	1.80 ppb