Bromoform

Coffey PWS

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	0.620 ppb	1	1	0.620 ppb
2015	0.600 ppb	2	2	0.540 ppb - 0.660 ppb
2016	0.648 ppb	4	4	0.510 ppb - 0.770 ppb
2017	0.408 ppb	4	2	ND - 0.970 ppb
2018	0.595 ppb	8	8	0.520 ppb - 0.660 ppb
2019	0.165 ppb	8	2	ND - 0.720 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
2014-07-23	AC30498	0.620 ppb
2015-07-28	AC56932	0.540 ppb
2015-10-06	AC61145	0.660 ppb
2016-01-08	AC64949	0.510 ppb
2016-04-12	AC69308	0.550 ppb
2016-09-01	AC83727	0.760 ppb
2016-10-14	AC86218	0.770 ppb
2017-01-11	AC89029	ND
2017-04-12	AC94396	ND
2017-07-17	AD01303	0.660 ppb
2017-10-11	AD07834	0.970 ppb
2018-01-26	AD12817	0.650 ppb
2018-01-26	AD12818	0.600 ppb
2018-04-11	AD17948	0.620 ppb
2018-04-11	AD17949	0.660 ppb
2018-07-11	AD29083	0.640 ppb
2018-07-11	AD29084	0.550 ppb
2018-11-07	AD34357	0.520 ppb
2018-11-07	AD34358	0.520 ppb
2019-01-28	AD37668	ND
2019-01-28	AD37669	ND
2019-04-17	AD46088	ND
2019-04-17	AD46089	ND
2019-07-10	AD51698	ND
2019-07-10	AD51699	ND
2019-11-25	AD56670	0.720 ppb
2019-11-25	AD56671	0.600 ppb