Bromoform

Wilton, City of

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	0.130 ppb	4	1	ND - 0.520 ppb
2015	0.440 ppb	4	3	ND - 0.650 ppb
2016	0.585 ppb	4	2	ND - 1.33 ppb
2017	0.830 ppb	4	4	0.530 ppb - 1.15 ppb
2018	0.555 ppb	4	3	ND - 0.970 ppb
2019	ND	4	0	ND

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
2014-02-18	14-S240	0.520 ppb
2014-05-20	14-S813	ND
2014-08-19	14-S2035	ND
2014-11-17	14-S2745	ND
2015-02-18	15-S193	0.550 ppb
2015-05-19	15-S740	ND
2015-08-18	15-S1751	0.650 ppb
2015-11-16	15-S2450	0.560 ppb
2016-02-17	16-S186	ND
2016-05-17	16-S942	ND
2016-08-23	16-S2187	1.01 ppb
2016-11-15	16-S2839	1.33 ppb
2017-02-21	17-S320	1.15 ppb
2017-05-15	17-S768	0.970 ppb
2017-08-21	17-S1730	0.530 ppb
2017-11-13	17-S2360	0.670 ppb
2018-02-13	18-S198	0.970 ppb
2018-05-15	18-S694	0.570 ppb
2018-08-21	18-S1764	0.680 ppb
2018-11-14	18-S2368	ND
2019-02-11	19-S185	ND
2019-05-16	19-S648	ND
2019-08-19	19-S1667	ND
2019-11-12	19-S2424	ND