Bromoform

Meadow District

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	0.307 ppb	6	2	ND - 1.10 ppb
2015	0.348 ppb	4	2	ND - 0.830 ppb
2016	0.550 ppb	3	2	ND - 0.900 ppb
2017	0.522 ppb	5	3	ND - 1.16 ppb
2018	0.460 ppb	3	2	ND - 0.690 ppb
2019	0.910 ppb	2	2	0.800 ppb - 1.02 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
2014-06-30	S504511	ND
2014-07-24	L5171754-3	ND
2014-07-24	L5171754-2	ND
2014-08-25	S479228	1.10 ppb
2014-08-25	S479187	0.740 ppb
2014-10-24	S251490	ND
2015-01-22	S588750	ND
2015-08-12	S612424	0.560 ppb
2015-08-12	S612423	0.830 ppb
2015-10-20	S614748	ND
2016-03-01	S659176	0.900 ppb
2016-08-17	S670377	ND
2016-08-17	S670376	0.750 ppb
2017-01-25	S670508	1.16 ppb
2017-07-25	S730815	ND
2017-07-25	S679349	ND
2017-08-29	S730913	0.550 ppb
2017-08-29	S730909	0.900 ppb
2018-08-30	S812183	0.690 ppb
2018-08-30	S812179	0.690 ppb
2018-11-09	S812573	ND
2019-08-01	S898798	1.02 ppb
2019-08-01	S898802	0.800 ppb