Dibromochloromethane

Stoughton Waterworks

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
2013	N/A	0	0	N/A
2014	0.258 ppb	6	2	ND - 1.000 ppb
2015	1.28 ppb	2	2	0.860 ppb - 1.70 ppb
2016	0.735 ppb	2	2	0.370 ppb - 1.10 ppb
2017	0.474 ppb	5	3	ND - 1.60 ppb
2018	1.33 ppb	2	2	0.460 ppb - 2.20 ppb
2019	1.27 ppb	2	2	0.730 ppb - 1.80 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
2014-03-05	773163	ND
2014-03-05	773172	ND
2014-03-05	773166	ND
2014-03-05	773169	ND
2014-07-23	805340	1.000 ppb
2014-08-11	809428	0.550 ppb
2015-08-19	878028	0.860 ppb
2015-08-19	878029	1.70 ppb
2016-07-27	935782	1.10 ppb
2016-07-27	935783	0.370 ppb
2017-04-26	985399	ND
2017-04-26	985404	0.240 ppb
2017-05-02	986309	ND
2017-08-02	1008452	0.530 ppb
2017-08-02	1008451	1.60 ppb
2018-07-16	1067520	0.460 ppb
2018-07-16	1067519	2.20 ppb
2019-07-09	1133098	0.730 ppb
2019-07-09	1133097	1.80 ppb