Dibromochloromethane

Caldwell County Water System-SE

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	0.250 ppb	16	4	ND - 1.000 ppb
2015	0.875 ppb	16	8	ND - 2.00 ppb
2016	0.750 ppb	16	8	ND - 2.00 ppb
2017	0.288 ppb	16	4	ND - 1.40 ppb
2018	0.0688 ppb	16	1	ND - 1.10 ppb
2019	0.169 ppb	16	2	ND - 1.50 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
2014-03-06	T-1403-012	ND
2014-03-06	T-1403-011	ND
2014-03-06	T-1403-010	ND
2014-03-06	T-1403-013	ND
2014-06-17	T-1406-021	ND
2014-06-17	T-1406-020	ND
2014-06-17	T-1406-019	ND
2014-06-17	T-1406-018	ND
2014-09-10	T-1409-036	ND
2014-09-10	T-1409-035	ND
2014-09-10	T-1409-034	ND
2014-09-10	T-1409-033	ND
2014-12-03	T-1412-010	1.000 ppb
2014-12-03	T-1412-007	1.000 ppb
2014-12-03	T-1412-008	1.000 ppb
2014-12-03	T-1412-009	1.000 ppb
2015-03-05		ND
2015-03-05		ND
2015-03-05		ND
2015-03-05		ND
2015-06-11		2.00 ppb
2015-06-11		2.00 ppb
2015-06-11		1.000 ppb
2015-06-11		2.00 ppb
2015-09-10		2.00 ppb
2015-09-10		2.00 ppb
2015-09-10		2.00 ppb
2015-09-10		1.000 ppb
2015-12-16		ND
2015-12-16		ND
2015-12-16		ND
2015-12-16		ND
2016-03-01	T-1603-008	ND
2016-03-01	T-1603-007	ND
2016-03-01	T-1603-006	ND
2016-03-01	T-1603-005	ND
2016-06-09	T-1606-014	1.000 ppb
2016-06-09	T-1606-013	1.000 ppb
2016-06-09	T-1606-015	1.000 ppb
2016-06-09	T-1606-016	1.000 ppb
2016-09-07	T-1609-004	2.00 ppb
2016-09-07	T-1609-003	2.00 ppb
2016-09-07	T-1609-002	2.00 ppb
2016-09-07	T-1609-001	2.00 ppb
2016-12-13	T-1612-017	ND
2016-12-13	T-1612-016	ND
2016-12-13	T-1612-015	ND
2016-12-13	T-1612-014	ND
2017-03-07	T-1703-006	ND
2017-03-07	T-1703-007	ND
2017-03-07	T-1703-008	ND
2017-03-07	T-1703-009	ND
2017-06-06	T-1706-008	ND
2017-06-06	T-1706-006	ND
2017-06-06	T-1706-007	ND
2017-06-06	T-1706-005	ND
2017-09-12	40053-02	1.40 ppb
2017-09-12	40053-04	1.000 ppb
2017-09-12	40053-03	1.000 ppb
2017-09-12	40053-01	1.20 ppb
2017-12-06	43871-04	ND
2017-12-06	43871-03	ND
2017-12-06	43871-02	ND
2017-12-06	43871-01	ND
2018-03-08	47668-04	ND
2018-03-08	47668-03	ND
2018-03-08	47668-02	ND
2018-03-08	47668-01	ND
2018-06-05	51722-04	ND
2018-06-05	51722-01	ND
2018-06-05	51722-02	ND
2018-06-05	51722-03	ND
2018-09-06	55720-04	ND
2018-09-06	55720-03	1.10 ppb
2018-09-06	55720-02	ND
2018-09-06	55720-01	ND
2018-12-06	60132-01	ND
2018-12-06	60132-02	ND
2018-12-06	60132-03	ND
2018-12-06	60132-04	ND
2019-03-14	64196-01	ND
2019-03-14	64196-02	ND
2019-03-14	64196-03	ND
2019-03-14	64196-04	ND
2019-06-12	68135-01	ND
2019-06-12	68135-04	ND
2019-06-12	68135-03	ND
2019-06-12	68135-02	ND
2019-09-04	71669-02	1.50 ppb
2019-09-04	71669-04	ND
2019-09-04	71669-03	1.20 ppb
2019-09-04	71669-01	ND
2019-12-03	75663-04	ND
2019-12-03	75663-03	ND
2019-12-03	75663-02	ND
2019-12-03	75663-01	ND