Bromoform

Douglass, 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	1.77 ppb	4	3	ND - 4.60 ppb
2015	3.21 ppb	4	4	0.560 ppb - 9.50 ppb
2016	0.805 ppb	4	2	ND - 2.40 ppb
2017	0.0900 ppb	9	1	ND - 0.810 ppb
2018	1.80 ppb	3	2	ND - 3.70 ppb
2019	0.893 ppb	4	2	ND - 2.90 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
2014-02-11	61238	0.590 ppb
2014-05-27	120640	4.60 ppb
2014-08-11	171501	ND
2014-11-03	226596	1.90 ppb
2015-02-02	271325	0.560 ppb
2015-05-25	337607	0.780 ppb
2015-09-29	414812	9.50 ppb
2015-11-09	427947	2.00 ppb
2016-02-23	497918	ND
2016-05-31	554625	0.820 ppb
2016-09-06	616491	ND
2016-11-30	666247	2.40 ppb
2017-02-28	715300	0.810 ppb
2017-06-13	778742	ND
2017-09-26	848895	ND
2017-10-24	866856_PACE	ND
2017-10-24	866855_PACE	ND
2017-10-24	866854_PACE	ND
2017-10-24	866853_PACE	ND
2017-10-24	866817_PACE	ND
2017-11-28	883722	ND
2018-03-27	907572	1.70 ppb
2018-07-30	1014769	ND
2018-11-12	1076472	3.70 ppb
2019-02-18	1122957	0.670 ppb
2019-05-21	1157551	ND
2019-09-24	1247800	ND
2019-11-19	1277926	2.90 ppb