Bromoform

Marion, 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	0.690 ppb	4	4	0.610 ppb - 0.820 ppb
2015	0.448 ppb	4	3	ND - 0.690 ppb
2016	0.233 ppb	4	1	ND - 0.930 ppb
2017	ND	4	0	ND
2018	0.133 ppb	4	1	ND - 0.530 ppb
2019	ND	4	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
2014-03-10	76695	0.610 ppb
2014-07-08	140901	0.670 ppb
2014-09-30	204523	0.660 ppb
2014-12-15	247989	0.820 ppb
2015-03-23	300962	0.550 ppb
2015-06-29	356371	ND
2015-09-29	414816	0.550 ppb
2015-10-26	421757	0.690 ppb
2016-01-25	481268	ND
2016-04-25	533889	0.930 ppb
2016-07-18	585796	ND
2016-10-24	647831	ND
2017-01-23	680032	ND
2017-04-17	743585	ND
2017-07-31	808359	ND
2017-10-30	869076	ND
2018-01-22	908082	ND
2018-04-16	938309	ND
2018-07-23	1011711	ND
2018-10-22	1064802	0.530 ppb
2019-01-21	1108288	ND
2019-04-09	1139365	ND
2019-07-16	1205469	ND
2019-10-28	1265519	ND