Bromoform

Strong 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	ND	5	0	ND
2015	1.26 ppb	4	1	ND - 5.02 ppb
2016	0.955 ppb	2	1	ND - 1.91 ppb
2017	4.70 ppb	2	2	2.90 ppb - 6.50 ppb
2018	1.46 ppb	8	3	ND - 5.20 ppb
2019	1.42 ppb	5	2	ND - 5.80 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
2014-01-14	14016010901	ND
2014-06-25	14177003102	ND
2014-06-25	14177003202	ND
2014-08-05	14219010602	ND
2014-08-05	14219010702	ND
2015-03-10	15071002401	ND
2015-06-15	15169000602	ND
2015-07-14	15197005801	ND
2015-10-15	15289010401	5.02 ppb
2016-01-13	16015008601	1.91 ppb
2016-06-21	16175004202	ND
2017-02-27	17060000401	6.50 ppb
2017-06-19	17172001202	2.90 ppb
2018-02-27	18060003401	ND
2018-05-01	18123007101	ND
2018-06-18	18172001202	3.40 ppb
2018-06-18	18172001102	5.20 ppb
2018-09-17	18263004401	3.06 ppb
2018-09-17	18263004501	ND
2018-10-29	18305001401	ND
2018-11-26	18333002201	ND
2019-02-11	19045009701	ND
2019-07-15	19198002002	5.80 ppb
2019-07-15	19198001902	ND
2019-12-03	19339000702	1.30 ppb
2019-12-03	19339000802	ND