Bromoform

City of Rollingwood

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	1.83 ppb	4	4	1.10 ppb - 2.80 ppb
2015	0.700 ppb	4	2	ND - 1.50 ppb
2016	0.325 ppb	4	1	ND - 1.30 ppb
2017	0.250 ppb	4	1	ND - 1.000 ppb
2018	0.700 ppb	4	2	ND - 1.50 ppb
2019	0.250 ppb	4	1	ND - 1.000 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
2014-02-14	AC42926	2.80 ppb
2014-06-19	AC57464	2.10 ppb
2014-08-21	AC64871	1.10 ppb
2014-11-25	AC72974	1.30 ppb
2015-03-17	AC84682	1.30 ppb
2015-06-16	AC96192	ND
2015-09-14	AD06895	1.50 ppb
2015-11-16	AD13624	ND
2016-02-11	AD23361	1.30 ppb
2016-05-27	AD38634	ND
2016-08-05	AD47100	ND
2016-11-03	AD56461	ND
2017-02-01	AD68092	ND
2017-05-15	AD84226	ND
2017-07-17	AD89491	ND
2017-12-01	AE06431	1.000 ppb
2018-02-20	AE14418	1.50 ppb
2018-05-15	AE26382	ND
2018-08-03	AE35687	1.30 ppb
2018-11-20	AE46657	ND
2019-01-30	AE52193	ND
2019-05-30	AE68627	ND
2019-07-10	AE73895	ND
2019-12-05	AE91428	1.000 ppb