Dibromochloromethane

Jay Peak 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	0.125 ppb	4	1	ND - 0.500 ppb
2015	0.550 ppb	2	1	ND - 1.10 ppb
2016	0.450 ppb	2	1	ND - 0.900 ppb
2017	0.1000 ppb	6	1	ND - 0.600 ppb
2018	0.350 ppb	2	1	ND - 0.700 ppb
2019	0.350 ppb	2	1	ND - 0.700 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
2014-07-08	1407-13205-002	ND
2014-07-08	1407-13205-001	ND
2014-08-19	1408-16892-003	ND
2014-08-19	1408-16892-001	0.500 ppb
2015-09-22	1509-20440-003	ND
2015-09-22	1509-20440-001	1.10 ppb
2016-08-23	1608-18689-003	ND
2016-08-23	1608-18689-001	0.900 ppb
2017-02-21	1702-03644-002	ND
2017-08-10	1708-18580-003	ND
2017-08-10	1708-18580-001	0.600 ppb
2017-08-10	1708-18581-002	ND
2017-08-10	1708-18581-001	ND
2017-08-15	1708-18944-001	ND
2018-08-21	1808-21102-003	ND
2018-08-21	1808-21102-001	0.700 ppb
2019-09-16	1909-23748-001	0.700 ppb
2019-09-16	1909-23748-003	ND