Bromoform

California Water Service Company - Dixon

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

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	0.159 ppb	7	2	ND - 0.590 ppb
2015	1.09 ppb	3	2	ND - 2.52 ppb
2016	ND	6	0	ND
2017	ND	5	0	ND
2018	ND	3	0	ND
2019	0.400 ppb	3	1	ND - 1.20 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
2014-01-30	5701-007-1026	ND
2014-02-18	5701-008-1150	ND
2014-05-20	5701-017-1417	ND
2014-08-05	5701-802-1105	0.520 ppb
2014-08-05	5701-801-1025	0.590 ppb
2014-12-03	5701-002-1405	ND
2014-12-30	5810-004-1430	ND
2015-02-18	5701-006-0900	2.52 ppb
2015-08-10	5701-801-0936	0.750 ppb
2015-08-10	5701-802-0937	ND
2016-03-16	5701-002-1035	ND
2016-05-19	5701-017-1025	ND
2016-06-13	9590-020-1700	ND
2016-08-15	5701-801-1055	ND
2016-08-15	5701-802-1055	ND
2016-12-07	5810-002-1347	ND
2017-01-30	5701-002-0919	ND
2017-02-28	5701-008-0951	ND
2017-05-03	5701-017-1505	ND
2017-08-14	5810-802-1012	ND
2017-08-14	5810-801-1038	ND
2018-05-08	5701-017-1434	ND
2018-08-07	5701-802-0930	ND
2018-08-07	5701-801-0929	ND
2019-05-20	5701-017-1054	ND
2019-08-06	5701-801-0959	ND
2019-08-06	5701-802-0943	1.20 ppb