Bromoform

Darboy Sanitary District 1

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	0.254 ppb	5	3	ND - 0.590 ppb
2015	0.287 ppb	3	2	ND - 0.510 ppb
2016	0.213 ppb	4	3	ND - 0.420 ppb
2017	0.365 ppb	4	3	ND - 0.560 ppb
2018	ND	3	0	ND
2019	0.327 ppb	3	3	0.260 ppb - 0.370 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
2014-05-29	5027069A	ND
2014-08-21	812173	ND
2014-08-21	812171	0.200 ppb
2014-08-21	812175	0.480 ppb
2014-08-21	812176	0.590 ppb
2015-05-13	5028921X	ND
2015-07-29	873912	0.350 ppb
2015-07-29	873911	0.510 ppb
2016-05-13	5031080A	ND
2016-08-12	938806	0.420 ppb
2016-08-12	938805	0.240 ppb
2016-08-12	938807	0.190 ppb
2017-08-24	1013489	ND
2017-08-24	1013493	0.350 ppb
2017-08-24	1013598	0.550 ppb
2017-08-24	1013599	0.560 ppb
2018-05-25	5034705B	ND
2018-08-23	1075743	ND
2018-08-23	1075744	ND
2019-07-18	1135409	0.260 ppb
2019-07-18	1135410	0.370 ppb
2019-08-14	1140949	0.350 ppb