Dibromochloromethane

Mound City, City of

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	1.60 ppb	4	4	0.800 ppb - 2.40 ppb
2015	0.820 ppb	1	1	0.820 ppb
2016	0.465 ppb	4	3	ND - 0.720 ppb
2017	0.705 ppb	4	4	0.580 ppb - 0.860 ppb
2018	1.45 ppb	4	4	0.880 ppb - 2.30 ppb
2019	0.285 ppb	4	2	ND - 0.620 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	60813	0.800 ppb
2014-06-09	126850	2.40 ppb
2014-08-19	177539	2.00 ppb
2014-11-18	234388	1.20 ppb
2015-08-18	390232	0.820 ppb
2016-02-23	497915	0.550 ppb
2016-06-08	560871	ND
2016-09-21	627624	0.720 ppb
2016-11-30	665799	0.590 ppb
2017-02-21	711517	0.860 ppb
2017-05-22	764775	0.580 ppb
2017-08-30	829874	0.620 ppb
2017-11-28	883060	0.760 ppb
2018-02-27	907119	1.10 ppb
2018-05-28	976384	1.50 ppb
2018-08-14	1025919	2.30 ppb
2018-11-24	1081320	0.880 ppb
2019-02-04	1117697	0.620 ppb
2019-05-20	1157369	0.520 ppb
2019-08-19	1226188	ND
2019-11-13	1274815	ND