Bromoform

Portage Waterworks

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	0.418 ppb	4	2	ND - 1.10 ppb
2015	0.217 ppb	3	1	ND - 0.650 ppb
2016	0.238 ppb	4	1	ND - 0.950 ppb
2017	0.390 ppb	4	2	ND - 0.860 ppb
2018	0.360 ppb	4	2	ND - 1.000 ppb
2019	0.353 ppb	4	2	ND - 0.790 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
2014-01-21	419878	ND
2014-01-21	419876	ND
2014-07-07	476379	0.570 ppb
2014-07-07	476380	1.10 ppb
2015-01-26	549689	ND
2015-07-07	604141	ND
2015-07-07	604142	0.650 ppb
2016-01-11	679225	ND
2016-02-01	685988	ND
2016-07-19	746771	ND
2016-07-19	746781	0.950 ppb
2017-01-03	824523	ND
2017-01-03	824505	ND
2017-07-10	889650	0.700 ppb
2017-07-10	889649	0.860 ppb
2018-02-05	980450	ND
2018-02-05	980451	0.440 ppb
2018-07-16	149263	ND
2018-07-16	149262	1.000 ppb
2019-01-07	229921	ND
2019-01-07	229920	ND
2019-07-17	306057	0.620 ppb
2019-07-17	306083	0.790 ppb