Bromoform

City of Paradise

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	4.35 ppb	4	4	3.90 ppb - 4.90 ppb
2015	1.15 ppb	4	1	ND - 4.60 ppb
2016	ND	4	0	ND
2017	1.21 ppb	4	2	ND - 3.16 ppb
2018	3.02 ppb	4	4	2.27 ppb - 3.85 ppb
2019	1.90 ppb	4	4	1.31 ppb - 2.59 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
2014-03-19	Q1409000001	4.40 ppb
2014-06-24	Q1423423001	4.90 ppb
2014-09-24	Q1447421002	4.20 ppb
2014-12-08	Q1458932001	3.90 ppb
2015-03-23	Q1510860001	4.60 ppb
2015-06-11	Q1521675001	ND
2015-09-11	Q1535391001	ND
2015-12-01	Q1547427001	ND
2016-03-14	Q1610427001	ND
2016-06-21	Q1625426001	ND
2016-09-14	Q1637660001	ND
2016-12-06	Q1653275001	ND
2017-03-07	Q1709577001	ND
2017-04-20	Q1716309002	ND
2017-09-05	Q1740965001	1.66 ppb
2017-12-14	Q1766173001	3.16 ppb
2018-02-28	Q1808236001	2.77 ppb
2018-05-29	Q1821421001	3.20 ppb
2018-08-07	Q1831519001	3.85 ppb
2018-11-07	Q1844566001	2.27 ppb
2019-01-08	Q1900654002	1.52 ppb
2019-04-02	Q1913226001	2.19 ppb
2019-07-15	Q1944626001	1.31 ppb
2019-10-30	Q1974606001	2.59 ppb