Bromoform

Oak Forest

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	0.132 ppb	8	2	ND - 0.527 ppb
2015	0.734 ppb	8	4	ND - 3.45 ppb
2016	0.256 ppb	16	6	ND - 0.767 ppb
2017	0.383 ppb	16	4	ND - 2.17 ppb
2018	ND	16	0	ND
2019	0.164 ppb	16	4	ND - 0.771 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
2014-02-04	4020685-02	ND
2014-02-04	4020685-01	ND
2014-05-06	4051360-01	0.527 ppb
2014-05-06	4051360-02	0.527 ppb
2014-08-06	4081552-01	ND
2014-08-06	4081552-02	ND
2014-11-05	4111013-01	ND
2014-11-05	4111013-02	ND
2015-02-04	5020676-01	ND
2015-02-04	5020676-02	ND
2015-05-19	5053357-01	ND
2015-05-19	5053357-02	3.45 ppb
2015-08-11	5082222-01	1.41 ppb
2015-08-11	5082222-02	0.502 ppb
2015-11-19	5113252-01	ND
2015-11-19	5113252-02	0.511 ppb
2016-02-09	6021892-04	ND
2016-02-09	6021892-03	ND
2016-02-09	6021892-02	ND
2016-02-09	6021892-01	ND
2016-05-19	6053292-02	ND
2016-05-19	6053292-04	ND
2016-05-19	6053292-01	ND
2016-05-19	6053292-03	ND
2016-08-16	6083215-04	0.762 ppb
2016-08-16	6083215-01	0.767 ppb
2016-08-16	6083215-02	0.707 ppb
2016-08-16	6083215-03	0.679 ppb
2016-11-18	6113292-01	0.582 ppb
2016-11-18	6113292-04	0.596 ppb
2016-11-18	6113292-02	ND
2016-11-18	6113292-03	ND
2017-02-13	7022039-01	2.17 ppb
2017-02-13	7022039-04	1.000 ppb
2017-02-13	7022039-03	2.10 ppb
2017-02-13	7022039-02	0.854 ppb
2017-05-15	7052703-03	ND
2017-05-15	7052703-04	ND
2017-05-15	7052703-01	ND
2017-05-15	7052703-02	ND
2017-08-07	7081584-02	ND
2017-08-07	7081584-04	ND
2017-08-07	7081584-01	ND
2017-08-07	7081584-03	ND
2017-11-13	7112689-01	ND
2017-11-13	7112689-03	ND
2017-11-13	7112689-02	ND
2017-11-13	7112689-04	ND
2018-02-23	1802G54-004A	ND
2018-02-23	1802G54-003A	ND
2018-02-23	1802G54-002A	ND
2018-02-23	1802G54-001A	ND
2018-05-29	1805L26-004A	ND
2018-05-29	1805L26-001A	ND
2018-05-29	1805L26-002A	ND
2018-05-29	1805L26-003A	ND
2018-08-27	1808N97-004A	ND
2018-08-27	1808N97-003A	ND
2018-08-27	1808N97-002A	ND
2018-08-27	1808N97-001A	ND
2018-11-26	1811H20-001A	ND
2018-11-26	1811H20-002A	ND
2018-11-26	1811H20-003A	ND
2018-11-26	1811H20-004A	ND
2019-03-12	9032116-01	ND
2019-03-12	9032116-02	ND
2019-03-12	9032116-03	ND
2019-03-12	9032116-04	ND
2019-05-20	9054143-01	ND
2019-05-20	9054143-04	ND
2019-05-20	9054143-03	ND
2019-05-20	9054143-02	ND
2019-08-26	9085569-02	0.577 ppb
2019-08-26	9085569-04	0.680 ppb
2019-08-26	9085569-03	0.597 ppb
2019-08-26	9085569-01	0.771 ppb
2019-11-20	9114135-04	ND
2019-11-20	9114135-03	ND
2019-11-20	9114135-02	ND
2019-11-20	9114135-01	ND