Bromoform

Archie 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	0.0531 ppb	13	1	ND - 0.690 ppb
2015	0.184 ppb	9	3	ND - 0.560 ppb
2016	0.270 ppb	7	3	ND - 0.690 ppb
2017	0.710 ppb	1	1	0.710 ppb
2018	0.850 ppb	1	1	0.850 ppb
2019	0.800 ppb	1	1	0.800 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
2014-01-06	AC16577	ND
2014-01-06	AC16578	ND
2014-01-06	AC16579	ND
2014-01-06	AC16580	ND
2014-04-09	AC21484	ND
2014-04-09	AC21485	ND
2014-04-09	AC21486	ND
2014-04-09	AC21487	ND
2014-05-06	AC23882	ND
2014-07-21	AC30469	ND
2014-07-21	AC30470	0.690 ppb
2014-10-09	AC37560	ND
2014-10-09	AC37561	ND
2015-01-15	AC40284	ND
2015-01-15	AC40285	ND
2015-04-09	AC44974	ND
2015-04-09	AC44975	0.550 ppb
2015-05-11	AC47249	ND
2015-07-09	AC54168	ND
2015-07-09	AC54169	ND
2015-10-07	AC61132	0.560 ppb
2015-10-07	AC61133	0.550 ppb
2016-01-14	AC64934	ND
2016-01-14	AC64935	ND
2016-04-13	AC69295	ND
2016-04-13	AC69294	ND
2016-05-13	AC73246	0.580 ppb
2016-09-13	AC83718	0.620 ppb
2016-09-13	AC83717	0.690 ppb
2017-05-09	AC96454	0.710 ppb
2018-05-29	AD20651	0.850 ppb
2019-05-16	AD47624	0.800 ppb