Bromoform

Erie, 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	1.83 ppb	4	3	ND - 5.00 ppb
2015	0.153 ppb	4	1	ND - 0.610 ppb
2016	0.620 ppb	4	3	ND - 1.000 ppb
2017	0.975 ppb	4	3	ND - 1.40 ppb
2018	0.650 ppb	4	1	ND - 2.60 ppb
2019	0.420 ppb	4	2	ND - 0.880 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	76692	0.827 ppb
2014-06-09	126924	ND
2014-09-08	191429	1.50 ppb
2014-12-01	238917	5.00 ppb
2015-03-09	293681	0.610 ppb
2015-06-15	349807	ND
2015-09-14	406519	ND
2015-12-14	461878	ND
2016-03-07	506239	1.000 ppb
2016-06-06	560343	ND
2016-09-12	622522	0.510 ppb
2016-12-12	674275	0.970 ppb
2017-03-06	720896	1.10 ppb
2017-06-12	777940	ND
2017-09-12	838959	1.40 ppb
2017-12-18	895201	1.40 ppb
2018-03-05	931274	ND
2018-06-25	993986	2.60 ppb
2018-09-10	1041928	ND
2018-12-03	1084524	ND
2019-03-11	1135275	ND
2019-06-17	1188298	ND
2019-09-09	1239304	0.800 ppb
2019-12-09	1285622	0.880 ppb