Bromoform

City of Torrance Water Department

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

258

Samples

Samples exceeding legal limit (MCL)

197

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	9.37 ppb	45	32	ND - 46.8 ppb
2015	12.5 ppb	40	32	ND - 49.0 ppb
2016	6.70 ppb	37	32	ND - 38.4 ppb
2017	16.8 ppb	36	32	ND - 43.3 ppb
2018	7.08 ppb	50	34	ND - 46.0 ppb
2019	8.73 ppb	50	35	ND - 30.5 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
2014-02-05	9588-009-1008	ND
2014-02-05	9588-011-1015	ND
2014-02-05	9588-016-0950	ND
2014-03-04	3761-800-1058	44.8 ppb
2014-03-04	3761-801-1215	10.4 ppb
2014-03-04	3761-802-1134	2.50 ppb
2014-03-04	3761-803-1112	39.7 ppb
2014-03-04	3761-804-1047	46.8 ppb
2014-03-04	3761-805-1224	7.90 ppb
2014-03-04	3761-806-1034	12.1 ppb
2014-03-04	3761-807-1149	3.30 ppb
2014-04-22	9588-016-1025	ND
2014-06-05	3761-800-1050	26.8 ppb
2014-06-05	3761-801-0905	3.50 ppb
2014-06-05	3761-802-0840	3.30 ppb
2014-06-05	3761-803-1035	9.00 ppb
2014-06-05	3761-804-1105	26.7 ppb
2014-06-05	3761-805-1005	3.50 ppb
2014-06-05	3761-806-1120	16.6 ppb
2014-06-05	3761-807-0820	3.60 ppb
2014-06-24	9588-009-1000	ND
2014-06-24	9588-009-1008	ND
2014-06-24	9588-011-1008	ND
2014-07-30	9588-009-1010	ND
2014-07-30	9588-010-1015	ND
2014-07-30	9588-011-1020	ND
2014-07-30	9588-016-1035	ND
2014-09-11	3761-800-0900	31.1 ppb
2014-09-11	3761-801-1020	2.20 ppb
2014-09-11	3761-802-1230	1.90 ppb
2014-09-11	3761-803-0910	34.7 ppb
2014-09-11	3761-804-0920	28.6 ppb
2014-09-11	3761-805-1025	2.50 ppb
2014-09-11	3761-806-0950	3.20 ppb
2014-09-11	3761-807-1250	1.90 ppb
2014-11-25	9588-016-1000	ND
2014-12-09	3761-800-1025	10.2 ppb
2014-12-09	3761-801-0915	5.30 ppb
2014-12-09	3761-802-1020	2.30 ppb
2014-12-09	3761-803-1100	3.20 ppb
2014-12-09	3761-804-1040	4.00 ppb
2014-12-09	3761-805-0925	6.50 ppb
2014-12-09	3761-806-1300	21.0 ppb
2014-12-09	3761-807-1005	2.60 ppb
2014-12-30	9588-009-1010	ND
2015-03-23	3761-800-0955	3.80 ppb
2015-03-23	3761-801-1035	3.80 ppb
2015-03-23	3761-802-1400	3.50 ppb
2015-03-23	3761-803-0925	3.70 ppb
2015-03-23	3761-804-0935	4.10 ppb
2015-03-23	3761-805-1320	3.90 ppb
2015-03-23	3761-806-0945	3.90 ppb
2015-03-23	3761-807-1345	3.60 ppb
2015-03-31	9588-009-0901	ND
2015-03-31	9588-016-0922	ND
2015-04-21	9588-009-0933	ND
2015-05-20	9588-016-0930	ND
2015-06-18	3761-800-0910	32.4 ppb
2015-06-18	3761-801-0955	4.20 ppb
2015-06-18	3761-802-1235	9.10 ppb
2015-06-18	3761-803-0915	40.1 ppb
2015-06-18	3761-804-0925	43.6 ppb
2015-06-18	3761-805-1000	4.00 ppb
2015-06-18	3761-806-0933	8.60 ppb
2015-06-18	3761-807-1023	3.60 ppb
2015-07-29	9588-009-0934	ND
2015-07-29	9588-016-1004	ND
2015-09-03	3761-800-0825	48.7 ppb
2015-09-03	3761-801-0925	3.70 ppb
2015-09-03	3761-802-1010	1.90 ppb
2015-09-03	3761-803-0840	49.0 ppb
2015-09-03	3761-804-0847	48.4 ppb
2015-09-03	3761-805-0930	3.60 ppb
2015-09-03	3761-806-0858	9.50 ppb
2015-09-03	3761-807-0955	2.60 ppb
2015-10-28	9588-009-0926	ND
2015-10-28	9588-016-0951	ND
2015-12-08	3761-800-0855	35.7 ppb
2015-12-08	3761-801-1007	3.70 ppb
2015-12-08	3761-802-1050	11.5 ppb
2015-12-08	3761-803-0905	44.5 ppb
2015-12-08	3761-804-0911	41.4 ppb
2015-12-08	3761-805-1015	4.00 ppb
2015-12-08	3761-806-0921	11.2 ppb
2015-12-08	3761-807-1035	4.50 ppb
2016-02-23	9588-016-0932	ND
2016-03-02	9588-009-0919	ND
2016-03-09	3761-800-0900	38.4 ppb
2016-03-09	3761-801-0947	5.40 ppb
2016-03-09	3761-802-1009	34.4 ppb
2016-03-09	3761-803-0910	36.6 ppb
2016-03-09	3761-804-0917	33.4 ppb
2016-03-09	3761-805-0953	4.20 ppb
2016-03-09	3761-806-0926	4.00 ppb
2016-03-09	3761-807-1040	9.10 ppb
2016-05-12	9588-009-0906	ND
2016-05-12	9588-016-0930	ND
2016-06-08	3761-800-0855	3.00 ppb
2016-06-08	3761-801-0942	2.90 ppb
2016-06-08	3761-802-1020	3.00 ppb
2016-06-08	3761-803-0905	3.30 ppb
2016-06-08	3761-804-0915	3.50 ppb
2016-06-08	3761-805-0950	3.50 ppb
2016-06-08	3761-806-0925	3.30 ppb
2016-06-08	3761-807-1035	3.00 ppb
2016-09-07	3761-800-0850	3.00 ppb
2016-09-07	3761-801-0950	2.60 ppb
2016-09-07	3761-802-1040	3.50 ppb
2016-09-07	3761-803-0900	2.60 ppb
2016-09-07	3761-804-0907	3.20 ppb
2016-09-07	3761-805-1000	2.60 ppb
2016-09-07	3761-806-0920	3.30 ppb
2016-09-07	3761-807-1026	2.90 ppb
2016-09-27	9588-016-0910	ND
2016-12-07	3761-800-0906	3.30 ppb
2016-12-07	3761-801-1010	4.60 ppb
2016-12-07	3761-802-1100	4.40 ppb
2016-12-07	3761-803-0915	3.80 ppb
2016-12-07	3761-804-0924	4.10 ppb
2016-12-07	3761-805-1015	4.50 ppb
2016-12-07	3761-806-0945	4.80 ppb
2016-12-07	3761-807-1035	3.60 ppb
2017-01-31	9588-016-0920	ND
2017-03-07	3761-800-0935	41.4 ppb
2017-03-07	3761-801-1030	7.80 ppb
2017-03-07	3761-802-1115	26.8 ppb
2017-03-07	3761-803-0945	43.3 ppb
2017-03-07	3761-804-1010	38.8 ppb
2017-03-07	3761-805-1040	5.50 ppb
2017-03-07	3761-806-1000	8.30 ppb
2017-03-07	3761-807-1100	6.30 ppb
2017-04-19	9588-016-0915	ND
2017-06-06	3761-800-0910	42.1 ppb
2017-06-06	3761-801-1003	5.20 ppb
2017-06-06	3761-802-1041	7.80 ppb
2017-06-06	3761-803-0920	29.7 ppb
2017-06-06	3761-804-0927	43.2 ppb
2017-06-06	3761-805-1009	4.80 ppb
2017-06-06	3761-806-0936	9.20 ppb
2017-06-06	3761-807-1029	6.90 ppb
2017-09-12	3761-800-0905	37.4 ppb
2017-09-12	3761-801-0958	5.30 ppb
2017-09-12	3761-802-1053	5.60 ppb
2017-09-12	3761-803-0915	30.1 ppb
2017-09-12	3761-804-0925	34.6 ppb
2017-09-12	3761-805-1005	5.80 ppb
2017-09-12	3761-806-0935	5.50 ppb
2017-09-12	3761-807-1027	5.70 ppb
2017-10-04	3761-009-1330	ND
2017-10-10	9588-016-0933	ND
2017-12-13	3761-800-0940	42.1 ppb
2017-12-13	3761-801-1027	5.60 ppb
2017-12-13	3761-802-1243	1.000 ppb
2017-12-13	3761-803-0949	29.8 ppb
2017-12-13	3761-804-1000	40.4 ppb
2017-12-13	3761-805-1033	6.60 ppb
2017-12-13	3761-806-1006	15.6 ppb
2017-12-13	3761-807-1300	6.40 ppb
2018-01-30	9588-016-0930	ND
2018-02-23	9588-023-0935	ND
2018-02-23	9588-024-0955	ND
2018-03-14	3761-800-1002	32.9 ppb
2018-03-14	3761-801-1135	9.50 ppb
2018-03-14	3761-802-1110	9.10 ppb
2018-03-14	3761-803-1013	33.2 ppb
2018-03-14	3761-804-0951	46.0 ppb
2018-03-14	3761-805-1131	9.40 ppb
2018-03-14	3761-806-0937	23.5 ppb
2018-03-14	3761-807-1100	9.30 ppb
2018-04-19	9588-016-0950	ND
2018-06-14	9588-010-0945	ND
2018-06-14	9588-011-0940	1.10 ppb
2018-06-14	9588-023-1012	ND
2018-06-14	9588-024-0935	ND
2018-06-27	3761-800-0805	4.70 ppb
2018-06-27	3761-801-0850	3.10 ppb
2018-06-27	3761-802-0949	3.70 ppb
2018-06-27	3761-803-0800	1.80 ppb
2018-06-27	3761-804-0815	5.50 ppb
2018-06-27	3761-805-0900	3.20 ppb
2018-06-27	3761-806-0825	2.30 ppb
2018-06-27	3761-807-0925	3.50 ppb
2018-08-02	9588-010-0940	ND
2018-08-02	9588-011-0942	1.000 ppb
2018-08-02	9588-016-1030	ND
2018-08-02	9588-023-1000	ND
2018-08-02	9588-024-0933	ND
2018-09-17	3761-800-0805	1.000 ppb
2018-09-17	3761-801-0915	3.20 ppb
2018-09-17	3761-802-1025	2.40 ppb
2018-09-17	3761-803-0730	1.70 ppb
2018-09-17	3761-804-0815	2.10 ppb
2018-09-17	3761-805-0925	3.40 ppb
2018-09-17	3761-806-0825	4.30 ppb
2018-09-17	3761-807-1010	2.90 ppb
2018-11-08	9588-010-1020	ND
2018-11-08	9588-011-1045	ND
2018-11-08	9588-016-1005	ND
2018-11-08	9588-023-0948	ND
2018-11-08	9588-024-1037	ND
2018-12-04	3761-800-0925	27.2 ppb
2018-12-04	3761-801-0845	3.90 ppb
2018-12-04	3761-802-0815	3.70 ppb
2018-12-04	3761-803-0950	32.3 ppb
2018-12-04	3761-804-0920	32.4 ppb
2018-12-04	3761-805-0835	6.30 ppb
2018-12-04	3761-806-0910	21.5 ppb
2018-12-04	3761-807-0800	3.10 ppb
2019-01-23	9588-010-0948	ND
2019-01-23	9588-011-0945	ND
2019-01-23	9588-016-1033	ND
2019-01-23	9588-023-1010	ND
2019-01-23	9588-024-0940	ND
2019-03-20	3761-800-0825	28.8 ppb
2019-03-20	3761-801-0905	7.90 ppb
2019-03-20	3761-802-1000	1.60 ppb
2019-03-20	3761-803-0745	22.9 ppb
2019-03-20	3761-804-0800	28.2 ppb
2019-03-20	3761-805-0915	6.50 ppb
2019-03-20	3761-806-0810	15.5 ppb
2019-03-20	3761-807-0945	6.00 ppb
2019-05-01	9588-010-0945	ND
2019-05-01	9588-011-0940	1.20 ppb
2019-05-01	9588-016-0957	ND
2019-05-01	9588-024-0934	ND
2019-06-25	3761-800-0820	25.5 ppb
2019-06-25	3761-801-0910	4.20 ppb
2019-06-25	3761-802-0950	2.80 ppb
2019-06-25	3761-803-0810	15.5 ppb
2019-06-25	3761-804-0830	21.4 ppb
2019-06-25	3761-805-0900	3.70 ppb
2019-06-25	3761-806-0840	15.1 ppb
2019-06-25	3761-807-0930	3.20 ppb
2019-08-14	9588-010-0933	ND
2019-08-14	9588-011-0929	3.50 ppb
2019-08-14	9588-016-1130	ND
2019-08-14	9588-023-0955	ND
2019-09-18	3761-800-0745	24.9 ppb
2019-09-18	3761-801-0830	4.70 ppb
2019-09-18	3761-802-0930	3.00 ppb
2019-09-18	3761-803-0735	16.7 ppb
2019-09-18	3761-804-0755	21.1 ppb
2019-09-18	3761-805-0840	4.40 ppb
2019-09-18	3761-806-0805	18.9 ppb
2019-09-18	3761-807-0911	5.80 ppb
2019-10-30	9588-010-0935	1.60 ppb
2019-10-30	9588-011-0950	ND
2019-10-30	9588-016-1028	ND
2019-10-30	9588-023-1005	ND
2019-10-30	9588-024-0928	ND
2019-12-11	3761-800-0800	30.5 ppb
2019-12-11	3761-801-0845	5.60 ppb
2019-12-11	3761-802-0940	4.20 ppb
2019-12-11	3761-803-0745	22.6 ppb
2019-12-11	3761-804-0810	26.8 ppb
2019-12-11	3761-805-0855	5.70 ppb
2019-12-11	3761-806-0825	19.4 ppb
2019-12-11	3761-807-0925	7.10 ppb