Bromoform

City of Scotland

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	11.6 ppb	4	4	4.40 ppb - 25.6 ppb
2015	5.33 ppb	4	2	ND - 18.0 ppb
2016	ND	4	0	ND
2017	0.260 ppb	4	1	ND - 1.04 ppb
2018	0.265 ppb	4	1	ND - 1.06 ppb
2019	1.42 ppb	4	3	ND - 3.02 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
2014-03-10	Q1407779001	25.6 ppb
2014-05-13	Q1415817001	10.2 ppb
2014-08-12	Q1435686002	4.40 ppb
2014-11-24	Q1457556001	6.30 ppb
2015-03-03	Q1508043001	18.0 ppb
2015-06-10	Q1521498001	3.30 ppb
2015-07-21	Q1528271001	ND
2015-11-18	Q1545537001	ND
2016-02-29	Q1608267001	ND
2016-04-20	Q1615774002	ND
2016-08-03	Q1632243002	ND
2016-11-16	Q1650243002	ND
2017-03-06	Q1709224002	ND
2017-04-24	Q1716597002	ND
2017-08-10	Q1734624003	ND
2017-11-15	Q1758820001	1.04 ppb
2018-02-14	Q1806394001	1.06 ppb
2018-06-21	Q1825063001	ND
2018-09-10	Q1835684001	ND
2018-11-28	Q1848562002	ND
2019-02-13	Q1906762002	1.17 ppb
2019-05-21	Q1927491002	1.47 ppb
2019-09-16	Q1965550002	ND
2019-12-03	Q1978649002	3.02 ppb