Bromoform

Wilson County Rural Water District 10

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	0.203 ppb	4	1	ND - 0.810 ppb
2015	1.05 ppb	4	2	ND - 2.30 ppb
2016	0.450 ppb	4	1	ND - 1.80 ppb
2017	0.787 ppb	3	2	ND - 1.80 ppb
2018	1.83 ppb	4	3	ND - 3.60 ppb
2019	0.383 ppb	4	2	ND - 0.870 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
2014-01-07	31894	ND
2014-04-28	103578	0.810 ppb
2014-07-21	155916	ND
2014-10-27	220757	ND
2015-01-20	265066	ND
2015-05-04	328675	ND
2015-09-22	411268	1.90 ppb
2015-10-27	420954	2.30 ppb
2016-01-18	477804	ND
2016-04-11	526512	1.80 ppb
2016-08-22	608451	ND
2016-10-17	644698	ND
2017-02-20	679536	1.80 ppb
2017-05-01	750321	ND
2017-09-04	832186	0.560 ppb
2018-03-12	907490	2.10 ppb
2018-04-23	937895	1.60 ppb
2018-07-23	1011204	3.60 ppb
2018-11-13	1076873	ND
2019-01-21	1109363	ND
2019-04-22	1138562	0.870 ppb
2019-08-19	1226192	ND
2019-11-17	1277312	0.660 ppb