Bromoform

Alto

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.

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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	2	ND
2015	ND	7	ND
2016	ND	4	ND
2017	ND	5	ND
2018	ND	7	ND
2019	ND	4	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
2014-03-20	AI36503	ND
2014-08-21	AI50880	ND
2015-03-10	AI68777	ND
2015-03-10	AI68776	ND
2015-03-10	AI68775	ND
2015-03-10	AI68774	ND
2015-03-10	AI68773	ND
2015-03-10	AI68772	ND
2015-07-13	AI82818	ND
2016-03-09	AJ08001	ND
2016-03-09	AJ08000	ND
2016-03-09	AJ07999	ND
2016-06-21	AJ14860	ND
2017-01-24	AJ43416	ND
2017-05-17	AJ55685	ND
2017-06-28	AJ58904	ND
2017-07-26	AJ61793	ND
2017-10-24	AJ72298	ND
2018-02-27	AJ84670	ND
2018-02-27	AJ84669	ND
2018-02-27	AJ84668	ND
2018-02-27	AJ84667	ND
2018-02-27	AJ84666	ND
2018-02-27	AJ84665	ND
2018-06-27	AJ92643	ND
2019-04-30	AK16070	ND
2019-04-30	AK16069	ND
2019-04-30	AK16068	ND
2019-06-26	AK21059	ND