Bromoform

Golden State Water Company (GSWC) - Florence/Graham

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

135

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	2.09 ppb	17	12	ND - 8.10 ppb
2015	1.67 ppb	17	11	ND - 6.70 ppb
2016	1.23 ppb	21	8	ND - 7.50 ppb
2017	5.57 ppb	16	12	ND - 26.0 ppb
2018	1.58 ppb	32	16	ND - 12.0 ppb
2019	1.25 ppb	32	16	ND - 8.30 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
2014-02-04	2706-800-0907	1.80 ppb
2014-02-04	2706-801-0845	ND
2014-02-04	2706-802-0835	1.10 ppb
2014-02-04	2706-803-0856	2.60 ppb
2014-02-06	2706-010-1048	ND
2014-05-06	2706-800-0916	4.30 ppb
2014-05-06	2706-801-0852	2.40 ppb
2014-05-06	2706-802-0841	2.10 ppb
2014-05-06	2706-803-0903	3.00 ppb
2014-08-05	2706-800-0900	8.10 ppb
2014-08-05	2706-801-0835	1.30 ppb
2014-08-05	2706-802-0823	ND
2014-08-05	2706-803-0847	1.60 ppb
2014-11-04	2706-800-0930	4.70 ppb
2014-11-04	2706-801-1000	2.60 ppb
2014-11-04	2706-802-1015	ND
2014-11-04	2706-803-0945	ND
2015-02-03	2706-800-0923	3.20 ppb
2015-02-03	2706-801-0855	ND
2015-02-03	2706-802-0843	ND
2015-02-03	2706-803-0911	1.20 ppb
2015-02-05	2706-010-1148	ND
2015-05-05	2706-800-0954	4.30 ppb
2015-05-05	2706-801-0914	1.50 ppb
2015-05-05	2706-802-0924	ND
2015-05-05	2706-803-0938	ND
2015-08-04	2706-800-1004	4.60 ppb
2015-08-04	2706-801-0934	1.30 ppb
2015-08-04	2706-802-0920	ND
2015-08-04	2706-803-0949	1.30 ppb
2015-11-03	2706-800-0946	6.70 ppb
2015-11-03	2706-801-0909	1.70 ppb
2015-11-03	2706-802-0921	1.10 ppb
2015-11-03	2706-803-0935	1.50 ppb
2016-02-02	2706-800-1002	2.40 ppb
2016-02-02	2706-801-0919	ND
2016-02-02	2706-802-0932	ND
2016-02-02	2706-803-0952	ND
2016-02-04	4790-010-1030	ND
2016-05-03	2706-800-0951	5.60 ppb
2016-05-03	2706-801-0921	1.20 ppb
2016-05-03	2706-802-0930	ND
2016-05-03	2706-803-0940	1.60 ppb
2016-05-04	2706-027-0948	ND
2016-05-04	2706-033-1105	ND
2016-05-04	2706-034-1110	ND
2016-05-04	2706-036-0900	ND
2016-08-02	2706-800-0919	7.50 ppb
2016-08-02	2706-801-0907	1.30 ppb
2016-08-02	2706-802-0845	ND
2016-08-02	2706-803-0915	1.50 ppb
2016-11-08	2706-800-0825	4.70 ppb
2016-11-08	2706-801-0757	ND
2016-11-08	2706-802-0806	ND
2016-11-08	2706-803-0815	ND
2017-02-07	9590-800-0955	2.90 ppb
2017-02-07	9590-801-0926	ND
2017-02-07	9590-802-0913	ND
2017-02-07	9590-803-0941	1.000 ppb
2017-05-02	9590-800-0800	12.0 ppb
2017-05-02	9590-801-0928	6.70 ppb
2017-05-02	9590-802-0939	4.20 ppb
2017-05-02	9590-803-0950	2.10 ppb
2017-08-01	9590-800-1001	26.0 ppb
2017-08-01	9590-801-0932	12.0 ppb
2017-08-01	9590-802-0919	9.40 ppb
2017-08-01	9590-803-0946	5.50 ppb
2017-11-07	9590-800-1009	6.00 ppb
2017-11-07	9590-801-0937	1.30 ppb
2017-11-07	9590-802-0926	ND
2017-11-07	9590-803-0954	ND
2018-02-06	9590-800-0957	12.0 ppb
2018-02-06	9590-801-0924	ND
2018-02-06	9590-802-0904	ND
2018-02-06	9590-803-0937	1.40 ppb
2018-02-06	9590-804-0852	1.20 ppb
2018-02-06	9590-805-1014	1.000 ppb
2018-02-06	9590-806-1134	2.40 ppb
2018-02-06	9590-807-1108	ND
2018-05-01	9590-800-0849	6.70 ppb
2018-05-01	9590-801-0817	ND
2018-05-01	9590-802-0826	ND
2018-05-01	9590-803-0837	1.40 ppb
2018-05-01	9590-804-0803	ND
2018-05-01	9590-805-0911	1.20 ppb
2018-05-01	9590-806-1027	2.20 ppb
2018-05-01	9590-807-1010	ND
2018-08-08	9590-800-0942	4.40 ppb
2018-08-08	9590-801-0913	1.20 ppb
2018-08-08	9590-802-0919	ND
2018-08-08	9590-803-0931	1.40 ppb
2018-08-08	9590-804-0902	ND
2018-08-08	9590-805-0950	ND
2018-08-08	9590-806-1011	2.90 ppb
2018-08-08	9590-807-1002	ND
2018-11-07	9590-800-0854	5.80 ppb
2018-11-07	9590-801-0923	ND
2018-11-07	9590-802-0929	ND
2018-11-07	9590-803-0902	ND
2018-11-07	9590-804-0913	ND
2018-11-07	9590-805-0941	1.80 ppb
2018-11-07	9590-806-1004	3.40 ppb
2018-11-07	9590-807-0954	ND
2019-02-06	9590-800-0648	3.10 ppb
2019-02-06	9590-801-0730	ND
2019-02-06	9590-802-0738	ND
2019-02-06	9590-803-0700	1.10 ppb
2019-02-06	9590-804-0715	ND
2019-02-06	9590-805-0800	ND
2019-02-06	9590-806-0915	ND
2019-02-06	9590-807-0853	ND
2019-05-07	9590-800-0749	8.30 ppb
2019-05-07	9590-801-0832	1.70 ppb
2019-05-07	9590-802-0840	ND
2019-05-07	9590-803-0802	2.30 ppb
2019-05-07	9590-804-0817	1.80 ppb
2019-05-07	9590-805-0858	ND
2019-05-07	9590-806-1007	2.20 ppb
2019-05-07	9590-807-0946	1.20 ppb
2019-08-06	9590-800-0835	4.00 ppb
2019-08-06	9590-801-0914	1.50 ppb
2019-08-06	9590-802-0922	ND
2019-08-06	9590-803-0846	1.30 ppb
2019-08-06	9590-804-0900	1.10 ppb
2019-08-06	9590-805-0939	ND
2019-08-06	9590-806-1101	2.70 ppb
2019-08-06	9590-807-1028	ND
2019-11-05	9590-800-0912	ND
2019-11-05	9590-801-0952	ND
2019-11-05	9590-802-1000	3.00 ppb
2019-11-05	9590-803-0922	ND
2019-11-05	9590-804-0937	ND
2019-11-05	9590-805-1019	ND
2019-11-05	9590-806-1111	2.80 ppb
2019-11-05	9590-807-1138	2.00 ppb