Bromoform

Ephesus

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	Range of results
2014	ND	8	ND
2015	ND	5	ND
2016	ND	6	ND
2017	ND	6	ND
2018	ND	6	ND
2019	ND	3	ND

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
2014-01-15	AI26793	ND
2014-01-15	AI26792	ND
2014-01-15	AI26791	ND
2014-04-22	AI38581	ND
2014-07-09	AI45372	ND
2014-07-09	AI45371	ND
2014-07-09	AI45367	ND
2014-11-12	AI59496	ND
2015-03-19	AI69473	ND
2015-03-19	AI69472	ND
2015-03-19	AI69471	ND
2015-07-28	AI84482	ND
2015-07-28	AI84481	ND
2016-03-23	AJ08658	ND
2016-05-24	AJ12853	ND
2016-08-09	AJ21897	ND
2016-08-23	AJ23777	ND
2016-08-23	AJ23776	ND
2016-10-26	AJ32285	ND
2017-02-01	AJ43873	ND
2017-04-26	AJ54083	ND
2017-07-31	AJ62157	ND
2017-08-23	AJ65532	ND
2017-08-23	AJ65531	ND
2017-10-24	AJ72297	ND
2018-01-30	AJ78082	ND
2018-01-30	AJ78081	ND
2018-01-30	AJ78080	ND
2018-04-11	AJ87337	ND
2018-08-20	AJ98291	ND
2018-08-20	AJ98290	ND
2019-05-14	AK17469	ND
2019-08-27	AK28295	ND
2019-08-27	AK28296	ND