Dibromochloromethane

Rock Island

Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane 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	0.313 ppb	16	5	ND - 2.50 ppb
2015	1.77 ppb	16	8	ND - 4.28 ppb
2016	0.0329 ppb	16	1	ND - 0.527 ppb
2017	0.0763 ppb	16	1	ND - 1.22 ppb
2018	0.0824 ppb	16	2	ND - 0.707 ppb
2019	0.128 ppb	16	3	ND - 0.873 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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
2014-02-10	4021168-01	ND
2014-02-10	4021168-02	ND
2014-02-10	4021168-03	ND
2014-02-10	4021168-04	ND
2014-05-12	4051869-03	ND
2014-05-12	4051869-04	ND
2014-05-13	4051869-01	ND
2014-05-13	4051869-02	ND
2014-08-11	4082245-01	0.602 ppb
2014-08-11	4082245-02	0.562 ppb
2014-08-11	4082245-03	0.690 ppb
2014-08-11	4082245-04	0.645 ppb
2014-11-10	4111484-03	ND
2014-11-10	4111484-04	ND
2014-11-10	4111484-02	ND
2014-11-10	4111484-01	2.50 ppb
2015-02-09	5021349-01	4.22 ppb
2015-02-09	5021349-04	4.27 ppb
2015-02-09	5021349-02	4.26 ppb
2015-02-09	5021349-03	4.28 ppb
2015-05-11	5051715-01	2.85 ppb
2015-05-11	5051715-04	2.80 ppb
2015-05-11	5051715-03	2.81 ppb
2015-05-11	5051715-02	2.80 ppb
2015-08-10	5082056-02	ND
2015-08-10	5082056-03	ND
2015-08-10	5082056-01	ND
2015-08-10	5082056-04	ND
2015-11-09	5111585-02	ND
2015-11-09	5111585-03	ND
2015-11-09	5111585-01	ND
2015-11-09	5111585-04	ND
2016-02-08	6021464-04	ND
2016-02-08	6021464-03	ND
2016-02-08	6021464-02	ND
2016-02-08	6021464-01	ND
2016-05-09	6051493-02	ND
2016-05-09	6051493-04	ND
2016-05-09	6051493-01	ND
2016-05-09	6051493-03	ND
2016-08-08	6081683-04	ND
2016-08-08	6081683-01	ND
2016-08-08	6081683-02	ND
2016-08-08	6081683-03	0.527 ppb
2016-11-07	6111354-01	ND
2016-11-07	6111354-04	ND
2016-11-07	6111354-02	ND
2016-11-07	6111354-03	ND
2017-02-13	7022100-01	ND
2017-02-13	7022100-04	ND
2017-02-13	7022100-03	ND
2017-02-13	7022100-02	ND
2017-05-08	7051560-03	ND
2017-05-08	7051560-04	ND
2017-05-08	7051560-01	ND
2017-05-08	7051560-02	ND
2017-08-07	7081792-02	ND
2017-08-07	7081792-04	ND
2017-08-07	7081792-01	ND
2017-08-07	7081792-03	1.22 ppb
2017-11-13	7112505-01	ND
2017-11-13	7112505-03	ND
2017-11-13	7112505-02	ND
2017-11-13	7112505-04	ND
2018-02-27	8024277-04	ND
2018-02-27	8024277-03	0.707 ppb
2018-02-27	8024277-02	ND
2018-02-27	8024277-01	ND
2018-05-07	8051546-04	ND
2018-05-07	8051546-01	ND
2018-05-07	8051546-02	ND
2018-05-07	8051546-03	0.611 ppb
2018-08-06	8081673-04	ND
2018-08-06	8081673-03	ND
2018-08-06	8081673-02	ND
2018-08-06	8081673-01	ND
2018-11-12	8112406-01	ND
2018-11-12	8112406-04	ND
2018-11-26	8114394-01	ND
2018-11-26	8114394-02	ND
2019-02-11	9021895-01	ND
2019-02-11	9021895-02	0.585 ppb
2019-02-11	9021895-03	0.873 ppb
2019-02-11	9021895-04	0.589 ppb
2019-05-13	9053036-01	ND
2019-05-13	9053036-04	ND
2019-05-13	9053036-03	ND
2019-05-13	9053036-02	ND
2019-08-12	9082817-02	ND
2019-08-12	9082817-04	ND
2019-08-12	9082817-03	ND
2019-08-12	9082817-01	ND
2019-11-18	9113380-04	ND
2019-11-18	9113380-03	ND
2019-11-18	9113380-01	ND
2019-11-25	9114632-01	ND