Dibromochloromethane

Jamestown Fryeburg Water System

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.

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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	4	0	ND
2015	ND	4	0	ND
2016	0.825 ppb	4	4	0.800 ppb - 0.850 ppb
2017	0.600 ppb	4	2	ND - 1.20 ppb
2018	2.50 ppb	4	4	2.40 ppb - 2.60 ppb
2019	1.25 ppb	4	2	ND - 2.50 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
2014-08-14	L0047088-02	ND
2014-08-14	L0047088-01	ND
2014-08-14	L0047088-02	ND
2014-08-14	L0047088-01	ND
2015-08-20	35204097001	ND
2015-08-20	35204097001	ND
2015-08-20	35204097002	ND
2015-08-20	35204097002	ND
2016-08-18	LA24457-1	0.800 ppb
2016-08-18	LA24457-2	0.850 ppb
2016-08-18	LA24457-2	0.850 ppb
2016-08-18	LA24457-1	0.800 ppb
2017-08-10	35329950013	ND
2017-08-10	35329950013	ND
2017-08-10	35329950012	1.20 ppb
2017-08-10	35329950012	1.20 ppb
2018-08-20	35413455002	2.40 ppb
2018-08-20	35413455001	2.60 ppb
2018-08-20	35413455001	2.60 ppb
2018-08-20	35413455002	2.40 ppb
2019-08-27	35494462002	2.50 ppb
2019-08-27	35494462002	2.50 ppb
2019-09-04	35495523001	ND
2019-09-04	35495523001	ND