Bromoform

Seminole County Rural Water District #1

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	3.09 ppb	2	2	1.73 ppb - 4.44 ppb
2015	0.933 ppb	4	1	ND - 3.73 ppb
2016	0.158 ppb	4	1	ND - 0.630 ppb
2017	2.06 ppb	4	4	1.24 ppb - 2.92 ppb
2018	0.318 ppb	4	1	ND - 1.27 ppb
2019	0.265 ppb	4	1	ND - 1.06 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
2014-09-16	1409519	1.73 ppb
2014-12-21	1412537	4.44 ppb
2015-03-19	1503523	3.73 ppb
2015-06-19	1506559	ND
2015-09-17	1509516	ND
2015-12-01	1512032	ND
2016-03-09	1603366	ND
2016-06-09	1606241	ND
2016-09-08	1609321	0.630 ppb
2016-12-05	1612223	ND
2017-03-06	1703093	1.84 ppb
2017-06-13	1706330	1.24 ppb
2017-09-27	1709995	2.22 ppb
2017-12-05	1712067	2.92 ppb
2018-03-15	1803523	ND
2018-06-14	1806482	ND
2018-09-09	1809554	ND
2018-12-12	1812377	1.27 ppb
2019-03-24	1903597	1.06 ppb
2019-06-25	1906802	ND
2019-09-24	1909820	ND
2019-12-09	1912268	ND