Dibromochloromethane

Golden State Water Company (GSWC) - Claremont

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

121

Samples

Samples exceeding legal limit (MCL)

101

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	5.00 ppb	27	17	ND - 14.0 ppb
2015	14.9 ppb	20	16	ND - 29.0 ppb
2016	11.1 ppb	21	16	ND - 21.0 ppb
2017	5.61 ppb	20	20	2.40 ppb - 12.0 ppb
2018	13.3 ppb	16	16	6.70 ppb - 20.0 ppb
2019	9.97 ppb	17	16	ND - 18.0 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
2014-02-12	2706-800-1000	11.0 ppb
2014-02-12	2706-801-0920	10.00 ppb
2014-02-12	2706-802-1020	11.0 ppb
2014-02-12	2706-803-0940	11.0 ppb
2014-02-18	2706-006-1055	ND
2014-05-12	2706-800-1040	5.70 ppb
2014-05-12	2706-801-1310	7.70 ppb
2014-05-12	2706-802-1046	6.50 ppb
2014-05-12	2706-803-1053	6.10 ppb
2014-08-13	2706-800-1124	1.40 ppb
2014-08-13	2706-801-1309	9.50 ppb
2014-08-13	2706-802-1108	3.70 ppb
2014-08-13	2706-803-1101	6.00 ppb
2014-08-19	2706-002-0829	ND
2014-08-19	2706-039-0815	ND
2014-08-20	2706-019-1007	ND
2014-08-20	2706-020-0950	3.90 ppb
2014-08-20	2706-021-1037	ND
2014-08-20	2706-022-1025	ND
2014-08-20	2706-024-1055	ND
2014-09-29	2706-010-1215	ND
2014-11-04	2706-030-1218	ND
2014-11-12	2706-800-0923	10.00 ppb
2014-11-12	2706-801-1015	9.20 ppb
2014-11-12	2706-802-0950	8.40 ppb
2014-11-12	2706-803-0936	14.0 ppb
2014-11-18	2706-040-1022	ND
2015-02-09	2706-800-1035	15.0 ppb
2015-02-09	2706-801-1145	16.0 ppb
2015-02-09	2706-802-1055	8.30 ppb
2015-02-09	2706-803-1045	16.0 ppb
2015-05-12	2706-800-1034	18.0 ppb
2015-05-12	2706-801-1315	18.0 ppb
2015-05-12	2706-802-1042	9.50 ppb
2015-05-12	2706-803-1052	18.0 ppb
2015-08-10	2706-800-1325	27.0 ppb
2015-08-10	2706-801-1407	16.0 ppb
2015-08-10	2706-802-1339	28.0 ppb
2015-08-10	2706-803-1352	29.0 ppb
2015-08-17	2706-006-1049	ND
2015-08-17	2706-021-1114	ND
2015-08-17	2706-030-1014	ND
2015-11-04	2706-019-1353	ND
2015-11-10	2706-800-1026	22.0 ppb
2015-11-10	2706-801-1128	13.0 ppb
2015-11-10	2706-802-1035	22.0 ppb
2015-11-10	2706-803-1045	22.0 ppb
2016-02-08	2706-800-1007	18.0 ppb
2016-02-08	2706-801-1114	11.0 ppb
2016-02-08	2706-802-1126	18.0 ppb
2016-02-08	2706-803-1031	16.0 ppb
2016-05-10	2706-800-1035	7.00 ppb
2016-05-10	2706-801-1315	6.80 ppb
2016-05-10	2706-802-1044	7.00 ppb
2016-05-10	2706-803-1052	9.10 ppb
2016-08-10	2706-800-0948	19.0 ppb
2016-08-10	2706-801-1053	11.0 ppb
2016-08-10	2706-802-1001	19.0 ppb
2016-08-10	2706-803-1011	19.0 ppb
2016-08-23	2706-010-0856	ND
2016-08-23	2706-019-1032	ND
2016-08-23	2706-030-1020	ND
2016-08-23	2706-039-0845	ND
2016-08-23	2706-040-1000	ND
2016-11-07	2706-800-1038	20.0 ppb
2016-11-07	2706-801-1322	12.0 ppb
2016-11-07	2706-802-1048	21.0 ppb
2016-11-07	2706-803-1055	20.0 ppb
2017-02-14	9590-800-0926	5.60 ppb
2017-02-14	9590-801-0854	9.10 ppb
2017-02-14	9590-802-1010	5.40 ppb
2017-02-14	9590-803-1027	6.10 ppb
2017-05-09	9590-800-1128	2.40 ppb
2017-05-09	9590-801-1418	2.40 ppb
2017-05-09	9590-802-1439	2.70 ppb
2017-05-09	9590-803-1450	2.70 ppb
2017-08-08	9590-800-1345	3.30 ppb
2017-08-08	9590-801-1326	2.40 ppb
2017-08-08	9590-802-1400	2.60 ppb
2017-08-08	9590-803-1415	3.00 ppb
2017-10-09	9590-800-1042	5.40 ppb
2017-10-09	9590-801-1327	4.50 ppb
2017-10-09	9590-802-1340	6.20 ppb
2017-10-09	9590-803-1350	4.40 ppb
2017-11-13	9590-800-1120	12.0 ppb
2017-11-13	9590-801-1140	8.90 ppb
2017-11-13	9590-802-1329	12.0 ppb
2017-11-13	9590-803-1341	11.0 ppb
2018-03-06	9590-800-1010	9.70 ppb
2018-03-06	9590-801-0945	11.0 ppb
2018-03-06	9590-802-1025	9.50 ppb
2018-03-06	9590-803-1045	11.0 ppb
2018-05-08	9590-800-1015	16.0 ppb
2018-05-08	9590-801-1330	9.60 ppb
2018-05-08	9590-802-1030	16.0 ppb
2018-05-08	9590-803-1050	16.0 ppb
2018-08-14	9590-800-1316	13.0 ppb
2018-08-14	9590-801-1012	6.70 ppb
2018-08-14	9590-802-1142	12.0 ppb
2018-08-14	9590-803-1123	13.0 ppb
2018-11-13	9590-800-1043	20.0 ppb
2018-11-13	9590-801-0743	10.00 ppb
2018-11-13	9590-802-1024	20.0 ppb
2018-11-13	9590-803-1001	20.0 ppb
2019-02-11	9590-800-1315	12.0 ppb
2019-02-11	9590-801-1008	12.0 ppb
2019-02-11	9590-802-1127	13.0 ppb
2019-02-11	9590-803-1112	12.0 ppb
2019-05-13	9590-800-1240	18.0 ppb
2019-05-13	9590-801-1230	9.70 ppb
2019-05-13	9590-802-1102	17.0 ppb
2019-05-13	9590-803-1043	17.0 ppb
2019-08-12	9590-800-1110	6.00 ppb
2019-08-12	9590-801-1255	3.00 ppb
2019-08-12	9590-802-1235	6.00 ppb
2019-08-12	9590-803-1218	5.70 ppb
2019-10-23	9590-024-1042	ND
2019-11-13	9590-800-0925	8.50 ppb
2019-11-13	9590-801-0830	7.00 ppb
2019-11-13	9590-803-0845	8.60 ppb
2019-11-15	9590-802-0845	14.0 ppb