Dibromochloromethane

City of Los Banos

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

111

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	1.27 ppb	23	8	ND - 6.10 ppb
2015	2.12 ppb	16	10	ND - 6.90 ppb
2016	1.83 ppb	16	10	ND - 6.20 ppb
2017	1.16 ppb	28	13	ND - 5.80 ppb
2018	1.88 ppb	12	8	ND - 5.30 ppb
2019	1.34 ppb	16	8	ND - 5.10 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
2014-02-13	5810-900-0804	4.10 ppb
2014-02-13	5810-901-0839	3.00 ppb
2014-02-13	5810-902-1007	1.40 ppb
2014-02-13	5810-903-0952	4.30 ppb
2014-05-07	5810-900-0754	4.60 ppb
2014-05-07	5810-901-1329	3.00 ppb
2014-05-07	5810-902-1011	ND
2014-05-07	5810-903-0845	ND
2014-07-02	5810-001-0857	ND
2014-07-02	5810-002-0910	ND
2014-07-02	5810-003-0927	ND
2014-07-02	5810-005-1210	ND
2014-07-02	5810-006-1058	ND
2014-07-02	5810-007-1233	ND
2014-07-02	5810-009-1137	ND
2014-07-02	5810-010-1254	ND
2014-07-02	5810-011-1020	ND
2014-07-02	5810-012-1002	ND
2014-07-02	5810-014-1119	ND
2014-11-12	5810-900-0748	6.10 ppb
2014-11-12	5810-901-0825	2.70 ppb
2014-11-12	5810-902-1019	ND
2014-11-12	5810-903-1003	ND
2015-02-04	5810-900-1219	6.90 ppb
2015-02-04	5810-901-1129	3.20 ppb
2015-02-04	5810-902-1323	ND
2015-02-04	5810-903-1313	1.20 ppb
2015-05-06	5810-900-0750	6.70 ppb
2015-05-06	5810-901-0819	3.50 ppb
2015-05-06	5810-902-0938	ND
2015-05-06	5810-903-0854	1.30 ppb
2015-08-05	5810-900-0811	3.00 ppb
2015-08-05	5810-901-1400	1.40 ppb
2015-08-05	5810-902-1025	ND
2015-08-05	5810-903-1015	ND
2015-11-04	5810-900-0756	3.90 ppb
2015-11-04	5810-901-1331	2.80 ppb
2015-11-04	5810-902-0936	ND
2015-11-04	5810-903-0839	ND
2016-02-03	5810-900-0758	6.20 ppb
2016-02-03	5810-901-0832	2.90 ppb
2016-02-03	5810-902-0951	1.40 ppb
2016-02-03	5810-903-0851	1.80 ppb
2016-05-04	5810-900-0757	5.80 ppb
2016-05-04	5810-901-1339	2.60 ppb
2016-05-04	5810-902-1010	ND
2016-05-04	5810-903-0847	ND
2016-08-03	5810-900-0808	2.40 ppb
2016-08-03	5810-901-1339	2.20 ppb
2016-08-03	5810-902-1016	ND
2016-08-03	5810-903-0947	ND
2016-11-02	5810-900-0757	1.50 ppb
2016-11-02	5810-901-1245	2.40 ppb
2016-11-02	5810-902-1007	ND
2016-11-02	5810-903-0852	ND
2017-02-01	5810-900-0806	5.80 ppb
2017-02-01	5810-901-0850	3.10 ppb
2017-02-01	5810-902-1045	1.30 ppb
2017-02-01	5810-903-1027	1.20 ppb
2017-05-03	5810-900-0748	4.60 ppb
2017-05-03	5810-901-0827	2.00 ppb
2017-05-03	5810-902-1111	1.20 ppb
2017-05-03	5810-903-1055	1.000 ppb
2017-07-12	5810-001-0853	ND
2017-07-12	5810-002-0908	ND
2017-07-12	5810-003-0923	ND
2017-07-12	5810-005-1225	ND
2017-07-12	5810-009-1203	ND
2017-07-12	5810-010-1305	ND
2017-07-12	5810-011-1027	ND
2017-07-12	5810-012-0953	ND
2017-07-12	5810-013-0811	ND
2017-07-12	5810-014-1139	ND
2017-07-26	5810-006-1112	ND
2017-07-26	5810-007-1137	ND
2017-08-02	5810-900-0742	2.80 ppb
2017-08-02	5810-901-0814	1.20 ppb
2017-08-02	5810-902-0856	ND
2017-08-02	5810-903-0838	1.20 ppb
2017-11-01	5810-900-0811	5.20 ppb
2017-11-01	5810-901-0844	1.90 ppb
2017-11-01	5810-902-1116	ND
2017-11-01	5810-903-1056	ND
2018-05-02	5810-900-0732	5.30 ppb
2018-05-02	5810-901-0757	2.20 ppb
2018-05-02	5810-902-0846	ND
2018-05-02	5810-903-0827	1.50 ppb
2018-08-01	5810-900-0748	2.90 ppb
2018-08-01	5810-901-0818	2.00 ppb
2018-08-01	5810-902-0904	ND
2018-08-01	5810-903-0852	2.90 ppb
2018-11-07	5810-900-0805	2.20 ppb
2018-11-07	5810-901-0838	3.60 ppb
2018-11-07	5810-902-0922	ND
2018-11-07	5810-903-0909	ND
2019-02-13	5810-900-0759	3.90 ppb
2019-02-13	5810-901-0836	2.00 ppb
2019-02-13	5810-902-0906	ND
2019-02-13	5810-903-0920	1.10 ppb
2019-05-01	5810-900-0803	3.20 ppb
2019-05-01	5810-901-0836	ND
2019-05-01	5810-902-1015	ND
2019-05-01	5810-903-0902	ND
2019-08-14	5810-900-0733	1.80 ppb
2019-08-14	5810-901-0814	1.000 ppb
2019-08-14	5810-902-1043	ND
2019-08-14	5810-903-1017	ND
2019-11-13	5810-900-0757	5.10 ppb
2019-11-13	5810-901-0828	3.30 ppb
2019-11-13	5810-902-0913	ND
2019-11-13	5810-903-0858	ND