Bromoform

Cheney, City of

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	ND	12	0	ND
2015	ND	12	0	ND
2016	0.273 ppb	7	1	ND - 1.91 ppb
2017	ND	2	0	ND
2018	ND	6	0	ND
2019	ND	3	0	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
2014-03-06	97691	ND
2014-03-06	97692	ND
2014-03-06	97693	ND
2014-03-06	97694	ND
2014-05-28	00571	ND
2014-05-28	00574	ND
2014-05-28	00573	ND
2014-05-28	00572	ND
2014-11-20	07043	ND
2014-11-20	07042	ND
2014-11-20	07041	ND
2014-11-20	07044	ND
2015-03-20	10691	ND
2015-03-20	10693	ND
2015-03-20	10692	ND
2015-03-20	10694	ND
2015-05-12	12322	ND
2015-05-12	12321	ND
2015-05-12	12324	ND
2015-05-12	12323	ND
2015-08-26	15642	ND
2015-08-26	15641	ND
2015-08-26	15644	ND
2015-08-26	15643	ND
2016-02-11		ND
2016-02-11		ND
2016-02-11		ND
2016-02-11		ND
2016-05-24		ND
2016-08-16		ND
2016-08-16		1.91 ppb
2017-08-24		ND
2017-08-24		ND
2018-04-26		ND
2018-05-30		ND
2018-05-30		ND
2018-07-13		ND
2018-08-21		ND
2018-08-21		ND
2019-01-08		ND
2019-08-23		ND
2019-08-23		ND