Bromoform

City of Los Banos

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

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	5.58 ppb	23	12	ND - 27.0 ppb
2015	9.66 ppb	16	16	1.20 ppb - 27.0 ppb
2016	8.98 ppb	16	16	1.10 ppb - 27.0 ppb
2017	5.01 ppb	28	16	ND - 24.0 ppb
2018	9.74 ppb	12	12	1.40 ppb - 28.0 ppb
2019	7.40 ppb	16	15	ND - 22.0 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
2014-02-13	5810-900-0804	19.0 ppb
2014-02-13	5810-901-0839	10.00 ppb
2014-02-13	5810-902-1007	2.80 ppb
2014-02-13	5810-903-0952	20.0 ppb
2014-05-07	5810-900-0754	27.0 ppb
2014-05-07	5810-901-1329	14.0 ppb
2014-05-07	5810-902-1011	1.60 ppb
2014-05-07	5810-903-0845	2.40 ppb
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	18.0 ppb
2014-11-12	5810-901-0825	10.00 ppb
2014-11-12	5810-902-1019	1.50 ppb
2014-11-12	5810-903-1003	2.00 ppb
2015-02-04	5810-900-1219	22.0 ppb
2015-02-04	5810-901-1129	12.0 ppb
2015-02-04	5810-902-1323	1.40 ppb
2015-02-04	5810-903-1313	3.60 ppb
2015-05-06	5810-900-0750	23.0 ppb
2015-05-06	5810-901-0819	13.0 ppb
2015-05-06	5810-902-0938	1.70 ppb
2015-05-06	5810-903-0854	2.70 ppb
2015-08-05	5810-900-0811	18.0 ppb
2015-08-05	5810-901-1400	11.0 ppb
2015-08-05	5810-902-1025	1.20 ppb
2015-08-05	5810-903-1015	3.50 ppb
2015-11-04	5810-900-0756	27.0 ppb
2015-11-04	5810-901-1331	11.0 ppb
2015-11-04	5810-902-0936	1.30 ppb
2015-11-04	5810-903-0839	2.10 ppb
2016-02-03	5810-900-0758	18.0 ppb
2016-02-03	5810-901-0832	11.0 ppb
2016-02-03	5810-902-0951	3.00 ppb
2016-02-03	5810-903-0851	4.20 ppb
2016-05-04	5810-900-0757	27.0 ppb
2016-05-04	5810-901-1339	10.00 ppb
2016-05-04	5810-902-1010	1.30 ppb
2016-05-04	5810-903-0847	2.10 ppb
2016-08-03	5810-900-0808	26.0 ppb
2016-08-03	5810-901-1339	15.0 ppb
2016-08-03	5810-902-1016	1.30 ppb
2016-08-03	5810-903-0947	2.00 ppb
2016-11-02	5810-900-0757	8.40 ppb
2016-11-02	5810-901-1245	12.0 ppb
2016-11-02	5810-902-1007	1.10 ppb
2016-11-02	5810-903-0852	1.30 ppb
2017-02-01	5810-900-0806	22.0 ppb
2017-02-01	5810-901-0850	15.0 ppb
2017-02-01	5810-902-1045	2.60 ppb
2017-02-01	5810-903-1027	2.80 ppb
2017-05-03	5810-900-0748	24.0 ppb
2017-05-03	5810-901-0827	7.60 ppb
2017-05-03	5810-902-1111	2.80 ppb
2017-05-03	5810-903-1055	2.90 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	15.0 ppb
2017-08-02	5810-901-0814	7.10 ppb
2017-08-02	5810-902-0856	1.30 ppb
2017-08-02	5810-903-0838	5.80 ppb
2017-11-01	5810-900-0811	20.0 ppb
2017-11-01	5810-901-0844	8.70 ppb
2017-11-01	5810-902-1116	1.10 ppb
2017-11-01	5810-903-1056	1.60 ppb
2018-05-02	5810-900-0732	28.0 ppb
2018-05-02	5810-901-0757	11.0 ppb
2018-05-02	5810-902-0846	1.70 ppb
2018-05-02	5810-903-0827	5.20 ppb
2018-08-01	5810-900-0748	17.0 ppb
2018-08-01	5810-901-0818	7.60 ppb
2018-08-01	5810-902-0904	1.40 ppb
2018-08-01	5810-903-0852	18.0 ppb
2018-11-07	5810-900-0805	9.70 ppb
2018-11-07	5810-901-0838	13.0 ppb
2018-11-07	5810-902-0922	1.70 ppb
2018-11-07	5810-903-0909	2.60 ppb
2019-02-13	5810-900-0759	21.0 ppb
2019-02-13	5810-901-0836	7.30 ppb
2019-02-13	5810-902-0906	2.00 ppb
2019-02-13	5810-903-0920	3.60 ppb
2019-05-01	5810-900-0803	20.0 ppb
2019-05-01	5810-901-0836	2.60 ppb
2019-05-01	5810-902-1015	1.10 ppb
2019-05-01	5810-903-0902	1.60 ppb
2019-08-14	5810-900-0733	16.0 ppb
2019-08-14	5810-901-0814	5.90 ppb
2019-08-14	5810-902-1043	ND
2019-08-14	5810-903-1017	1.90 ppb
2019-11-13	5810-900-0757	22.0 ppb
2019-11-13	5810-901-0828	10.00 ppb
2019-11-13	5810-902-0913	1.60 ppb
2019-11-13	5810-903-0858	1.80 ppb