Bromoform

Hamilton Public Water System

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	0.0363 ppb	16	1	ND - 0.580 ppb
2015	ND	2	0	ND
2016	ND	2	0	ND
2017	ND	3	0	ND
2018	0.173 ppb	3	1	ND - 0.520 ppb
2019	ND	2	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
2014-01-09	A140176726	ND
2014-01-09	A140176719	ND
2014-01-09	A140176718	ND
2014-01-09	A140176717	ND
2014-04-09	A140190861	ND
2014-04-09	A140190860	ND
2014-04-09	A140190827	ND
2014-04-09	A140190826	ND
2014-07-09	A140213815	ND
2014-07-09	A140213817	0.580 ppb
2014-07-09	A140213816	ND
2014-07-09	A140213814	ND
2014-10-08	A140217396	ND
2014-10-08	A140217395	ND
2014-10-08	A140217394	ND
2014-10-08	A140217397	ND
2015-07-09	15G0614-01	ND
2015-07-09	15G0614-02	ND
2016-07-25	16G1923-01	ND
2016-07-25	16G1923-02	ND
2017-03-01	17C0040-02	ND
2017-07-05	17G0537-01	ND
2017-07-05	17G0537-02	ND
2018-04-18	18D1285-01	ND
2018-08-15	18H1623-01	0.520 ppb
2018-08-15	18H1623-02	ND
2019-07-15	5218937001	ND
2019-07-15	5218937002	ND