Bromoform

Golden State Water Company (GSWC) - Claremont

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform 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)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	3.41 ppb	27	16	ND - 9.60 ppb
2015	6.97 ppb	20	16	ND - 12.0 ppb
2016	4.90 ppb	21	15	ND - 12.0 ppb
2017	1.04 ppb	20	8	ND - 3.30 ppb
2018	5.05 ppb	16	16	2.20 ppb - 12.0 ppb
2019	2.95 ppb	17	12	ND - 6.30 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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	7.70 ppb
2014-02-12	2706-801-0920	7.30 ppb
2014-02-12	2706-802-1020	7.60 ppb
2014-02-12	2706-803-0940	7.30 ppb
2014-02-18	2706-006-1055	ND
2014-05-12	2706-800-1040	4.90 ppb
2014-05-12	2706-801-1310	6.00 ppb
2014-05-12	2706-802-1046	5.20 ppb
2014-05-12	2706-803-1053	5.20 ppb
2014-08-13	2706-800-1124	ND
2014-08-13	2706-801-1309	4.40 ppb
2014-08-13	2706-802-1108	2.60 ppb
2014-08-13	2706-803-1101	3.40 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	2.30 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	6.80 ppb
2014-11-12	2706-801-1015	6.10 ppb
2014-11-12	2706-802-0950	5.80 ppb
2014-11-12	2706-803-0936	9.60 ppb
2014-11-18	2706-040-1022	ND
2015-02-09	2706-800-1035	11.0 ppb
2015-02-09	2706-801-1145	12.0 ppb
2015-02-09	2706-802-1055	6.30 ppb
2015-02-09	2706-803-1045	12.0 ppb
2015-05-12	2706-800-1034	8.20 ppb
2015-05-12	2706-801-1315	8.20 ppb
2015-05-12	2706-802-1042	4.50 ppb
2015-05-12	2706-803-1052	8.60 ppb
2015-08-10	2706-800-1325	8.70 ppb
2015-08-10	2706-801-1407	5.20 ppb
2015-08-10	2706-802-1339	9.10 ppb
2015-08-10	2706-803-1352	9.70 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	10.00 ppb
2015-11-10	2706-801-1128	5.90 ppb
2015-11-10	2706-802-1035	10.00 ppb
2015-11-10	2706-803-1045	9.90 ppb
2016-02-08	2706-800-1007	10.00 ppb
2016-02-08	2706-801-1114	7.60 ppb
2016-02-08	2706-802-1126	11.0 ppb
2016-02-08	2706-803-1031	11.0 ppb
2016-05-10	2706-800-1035	1.10 ppb
2016-05-10	2706-801-1315	ND
2016-05-10	2706-802-1044	1.10 ppb
2016-05-10	2706-803-1052	1.30 ppb
2016-08-10	2706-800-0948	5.40 ppb
2016-08-10	2706-801-1053	3.40 ppb
2016-08-10	2706-802-1001	5.30 ppb
2016-08-10	2706-803-1011	5.30 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	11.0 ppb
2016-11-07	2706-801-1322	6.50 ppb
2016-11-07	2706-802-1048	12.0 ppb
2016-11-07	2706-803-1055	11.0 ppb
2017-02-14	9590-800-0926	3.20 ppb
2017-02-14	9590-801-0854	2.30 ppb
2017-02-14	9590-802-1010	3.30 ppb
2017-02-14	9590-803-1027	3.20 ppb
2017-05-09	9590-800-1128	ND
2017-05-09	9590-801-1418	ND
2017-05-09	9590-802-1439	ND
2017-05-09	9590-803-1450	ND
2017-08-08	9590-800-1345	ND
2017-08-08	9590-801-1326	ND
2017-08-08	9590-802-1400	ND
2017-08-08	9590-803-1415	ND
2017-10-09	9590-800-1042	ND
2017-10-09	9590-801-1327	ND
2017-10-09	9590-802-1340	ND
2017-10-09	9590-803-1350	ND
2017-11-13	9590-800-1120	2.30 ppb
2017-11-13	9590-801-1140	1.90 ppb
2017-11-13	9590-802-1329	2.30 ppb
2017-11-13	9590-803-1341	2.30 ppb
2018-03-06	9590-800-1010	2.80 ppb
2018-03-06	9590-801-0945	3.10 ppb
2018-03-06	9590-802-1025	2.70 ppb
2018-03-06	9590-803-1045	3.00 ppb
2018-05-08	9590-800-1015	3.50 ppb
2018-05-08	9590-801-1330	2.40 ppb
2018-05-08	9590-802-1030	3.60 ppb
2018-05-08	9590-803-1050	3.60 ppb
2018-08-14	9590-800-1316	4.00 ppb
2018-08-14	9590-801-1012	2.20 ppb
2018-08-14	9590-802-1142	3.80 ppb
2018-08-14	9590-803-1123	3.90 ppb
2018-11-13	9590-800-1043	12.0 ppb
2018-11-13	9590-801-0743	6.20 ppb
2018-11-13	9590-802-1024	12.0 ppb
2018-11-13	9590-803-1001	12.0 ppb
2019-02-11	9590-800-1315	5.50 ppb
2019-02-11	9590-801-1008	5.10 ppb
2019-02-11	9590-802-1127	6.30 ppb
2019-02-11	9590-803-1112	5.50 ppb
2019-05-13	9590-800-1240	3.70 ppb
2019-05-13	9590-801-1230	2.20 ppb
2019-05-13	9590-802-1102	3.40 ppb
2019-05-13	9590-803-1043	3.50 ppb
2019-08-12	9590-800-1110	ND
2019-08-12	9590-801-1255	ND
2019-08-12	9590-802-1235	ND
2019-08-12	9590-803-1218	ND
2019-10-23	9590-024-1042	ND
2019-11-13	9590-800-0925	3.50 ppb
2019-11-13	9590-801-0830	2.80 ppb
2019-11-13	9590-803-0845	3.50 ppb
2019-11-15	9590-802-0845	5.20 ppb