Bromoform

Wilson County Rural Water District 13

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	ND	2	0	ND
2015	1.04 ppb	4	3	ND - 1.80 ppb
2016	0.325 ppb	4	1	ND - 1.30 ppb
2017	0.985 ppb	4	4	0.520 ppb - 1.70 ppb
2018	2.16 ppb	4	4	0.840 ppb - 3.50 ppb
2019	0.388 ppb	4	2	ND - 0.910 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
2014-07-14	145670	ND
2014-12-29	253017	ND
2015-01-05	258195	ND
2015-04-13	312696	0.940 ppb
2015-09-22	411271	1.40 ppb
2015-10-27	421486	1.80 ppb
2016-02-08	490736	ND
2016-04-19	531423	1.30 ppb
2016-08-22	608463	ND
2016-10-25	648415	ND
2017-01-29	679879	0.920 ppb
2017-04-25	747336	0.520 ppb
2017-08-28	828980	1.70 ppb
2017-12-18	895048	0.800 ppb
2018-03-25	907932	2.40 ppb
2018-04-22	938229	1.90 ppb
2018-07-31	1016493	3.50 ppb
2018-10-30	1069047	0.840 ppb
2019-01-27	1110436	ND
2019-04-22	1139119	0.910 ppb
2019-07-22	1209192	ND
2019-11-19	1277932	0.640 ppb