Bromoform

Walpole Water Department

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

260

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	0.0875 ppb	16	2	ND - 0.700 ppb
2015	0.0579 ppb	48	4	ND - 0.790 ppb
2016	0.0475 ppb	48	4	ND - 0.580 ppb
2017	0.0558 ppb	52	4	ND - 0.760 ppb
2018	ND	48	0	ND
2019	ND	48	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	Result
2014-02-03	ND
2014-02-03	ND
2014-02-03	ND
2014-02-03	ND
2014-05-05	ND
2014-05-05	ND
2014-05-05	ND
2014-05-05	ND
2014-08-04	ND
2014-08-04	ND
2014-08-04	ND
2014-08-04	ND
2014-11-03	ND
2014-11-03	ND
2014-11-03	0.700 ppb
2014-11-03	0.700 ppb
2015-02-02	ND
2015-02-02	ND
2015-02-02	ND
2015-02-02	ND
2015-02-02	ND
2015-02-02	ND
2015-02-02	ND
2015-02-02	ND
2015-02-02	ND
2015-02-02	ND
2015-02-02	ND
2015-02-02	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	0.600 ppb
2015-05-04	0.600 ppb
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-11-02	ND
2015-11-02	ND
2015-11-02	0.790 ppb
2015-11-02	0.790 ppb
2015-11-02	ND
2015-11-02	ND
2015-11-02	ND
2015-11-02	ND
2015-11-02	ND
2015-11-02	ND
2015-11-02	ND
2015-11-02	ND
2016-02-01	ND
2016-02-01	ND
2016-02-01	ND
2016-02-01	ND
2016-02-01	ND
2016-02-01	ND
2016-02-01	ND
2016-02-01	ND
2016-02-01	ND
2016-02-01	ND
2016-02-01	ND
2016-02-01	ND
2016-05-02	ND
2016-05-02	ND
2016-05-02	ND
2016-05-02	ND
2016-05-02	ND
2016-05-02	ND
2016-05-02	ND
2016-05-02	ND
2016-05-16	ND
2016-05-16	ND
2016-05-16	0.580 ppb
2016-05-16	0.580 ppb
2016-08-01	ND
2016-08-01	ND
2016-08-01	0.560 ppb
2016-08-01	0.560 ppb
2016-08-01	ND
2016-08-01	ND
2016-08-01	ND
2016-08-01	ND
2016-08-01	ND
2016-08-01	ND
2016-08-01	ND
2016-08-01	ND
2016-11-07	ND
2016-11-07	ND
2016-11-07	ND
2016-11-07	ND
2016-11-07	ND
2016-11-07	ND
2016-11-07	ND
2016-11-07	ND
2016-11-07	ND
2016-11-07	ND
2016-11-07	ND
2016-11-07	ND
2017-02-06	ND
2017-02-06	ND
2017-02-06	0.690 ppb
2017-02-06	0.690 ppb
2017-02-06	ND
2017-02-06	ND
2017-02-06	ND
2017-02-06	ND
2017-02-06	ND
2017-02-06	ND
2017-02-06	ND
2017-02-06	ND
2017-05-01	ND
2017-05-01	ND
2017-05-01	0.760 ppb
2017-05-01	0.760 ppb
2017-05-01	ND
2017-05-01	ND
2017-05-01	ND
2017-05-01	ND
2017-05-01	ND
2017-05-01	ND
2017-05-01	ND
2017-05-01	ND
2017-08-07	ND
2017-08-07	ND
2017-08-07	ND
2017-08-07	ND
2017-08-07	ND
2017-08-07	ND
2017-08-07	ND
2017-08-07	ND
2017-08-07	ND
2017-08-07	ND
2017-08-07	ND
2017-08-07	ND
2017-08-23	ND
2017-08-23	ND
2017-08-23	ND
2017-08-23	ND
2017-11-06	ND
2017-11-06	ND
2017-11-06	ND
2017-11-06	ND
2017-11-06	ND
2017-11-06	ND
2017-11-06	ND
2017-11-06	ND
2017-11-06	ND
2017-11-06	ND
2017-11-06	ND
2017-11-06	ND
2018-02-05	ND
2018-02-05	ND
2018-02-05	ND
2018-02-05	ND
2018-02-05	ND
2018-02-05	ND
2018-02-05	ND
2018-02-05	ND
2018-02-05	ND
2018-02-05	ND
2018-02-05	ND
2018-02-05	ND
2018-05-07	ND
2018-05-07	ND
2018-05-07	ND
2018-05-07	ND
2018-05-07	ND
2018-05-07	ND
2018-05-07	ND
2018-05-07	ND
2018-05-07	ND
2018-05-07	ND
2018-05-07	ND
2018-05-07	ND
2018-08-06	ND
2018-08-06	ND
2018-08-06	ND
2018-08-06	ND
2018-08-06	ND
2018-08-06	ND
2018-08-06	ND
2018-08-06	ND
2018-08-06	ND
2018-08-06	ND
2018-08-06	ND
2018-08-06	ND
2018-11-05	ND
2018-11-05	ND
2018-11-05	ND
2018-11-05	ND
2018-11-05	ND
2018-11-05	ND
2018-11-05	ND
2018-11-05	ND
2018-11-05	ND
2018-11-05	ND
2018-11-05	ND
2018-11-05	ND
2019-02-04	ND
2019-02-04	ND
2019-02-04	ND
2019-02-04	ND
2019-02-04	ND
2019-02-04	ND
2019-02-04	ND
2019-02-04	ND
2019-02-04	ND
2019-02-04	ND
2019-02-04	ND
2019-02-04	ND
2019-05-06	ND
2019-05-06	ND
2019-05-06	ND
2019-05-06	ND
2019-05-06	ND
2019-05-06	ND
2019-05-06	ND
2019-05-06	ND
2019-05-06	ND
2019-05-06	ND
2019-05-06	ND
2019-05-06	ND
2019-08-05	ND
2019-08-05	ND
2019-08-05	ND
2019-08-05	ND
2019-08-05	ND
2019-08-05	ND
2019-08-05	ND
2019-08-05	ND
2019-08-05	ND
2019-08-05	ND
2019-08-05	ND
2019-08-05	ND
2019-11-04	ND
2019-11-04	ND
2019-11-04	ND
2019-11-04	ND
2019-11-04	ND
2019-11-04	ND
2019-11-04	ND
2019-11-04	ND
2019-11-04	ND
2019-11-04	ND
2019-11-04	ND
2019-11-04	ND