Bromoform

City of Portsmouth

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.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	N/A	0	N/A
2015	N/A	0	N/A
2016	ND	10	ND
2017	ND	19	ND
2018	ND	37	ND
2019	ND	27	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
2016-04-18	16-06587-VOC	ND
2016-08-03	216217-22	ND
2016-08-03	216217-21	ND
2016-08-03	216217-20	ND
2016-08-03	216217-19	ND
2016-08-03	216217-18	ND
2016-08-03	216217-17	ND
2016-08-03	216217-16	ND
2016-08-03	216217-15	ND
2016-08-03	216217-13	ND
2017-02-01	217033-13	ND
2017-02-01	217033-17	ND
2017-02-01	217033-18	ND
2017-02-01	217033-16	ND
2017-02-01	217033-15	ND
2017-02-01	217033-19	ND
2017-02-01	217033-20	ND
2017-02-01	217033-21	ND
2017-02-01	217033-22	ND
2017-05-04	17-07606	ND
2017-11-01	217306-27	ND
2017-11-01	217306-28	ND
2017-11-01	217306-29	ND
2017-11-01	217306-30	ND
2017-11-01	217306-31	ND
2017-11-01	217306-32	ND
2017-11-01	217306-33	ND
2017-11-01	217306-34	ND
2017-11-01	217306-26	ND
2018-02-01	218032-15	ND
2018-02-01	218032-16	ND
2018-02-01	218032-17	ND
2018-02-01	218032-18	ND
2018-02-01	218032-19	ND
2018-02-01	218032-20	ND
2018-02-01	218032-21	ND
2018-02-01	218032-22	ND
2018-02-01	218032-23	ND
2018-04-16	3914796	ND
2018-05-01	218124-15	ND
2018-05-01	218124-14	ND
2018-05-01	218124-16	ND
2018-05-01	218124-17	ND
2018-05-01	218124-18	ND
2018-05-01	218124-20	ND
2018-05-01	218124-19	ND
2018-05-01	218124-22	ND
2018-05-01	218124-21	ND
2018-08-01	218214-22	ND
2018-08-01	218214-21	ND
2018-08-01	218214-20	ND
2018-08-01	218214-19	ND
2018-08-01	218214-18	ND
2018-08-01	218214-17	ND
2018-08-01	218214-16	ND
2018-08-01	218214-15	ND
2018-08-01	218214-14	ND
2018-11-01	218306-22	ND
2018-11-01	218306-21	ND
2018-11-01	218306-20	ND
2018-11-01	218306-18	ND
2018-11-01	218306-19	ND
2018-11-01	218306-17	ND
2018-11-01	218306-16	ND
2018-11-01	218306-15	ND
2018-11-01	218306-14	ND
2019-02-05	219037-22	ND
2019-02-05	219037-21	ND
2019-02-05	219037-20	ND
2019-02-05	219037-19	ND
2019-02-05	219037-18	ND
2019-02-05	219037-17	ND
2019-02-05	219037-16	ND
2019-02-05	219037-15	ND
2019-02-05	219037-14	ND
2019-08-01	219214-15T	ND
2019-08-01	219214-21T	ND
2019-08-01	219214-20T	ND
2019-08-01	219214-19T	ND
2019-08-01	219214-18T	ND
2019-08-01	219214-17T	ND
2019-08-01	219214-16T	ND
2019-08-01	219214-14T	ND
2019-08-01	219214-22T	ND
2019-11-01	219305-14T	ND
2019-11-01	219305-15T	ND
2019-11-01	219305-16T	ND
2019-11-01	219305-17T	ND
2019-11-01	219305-18T	ND
2019-11-01	219305-19T	ND
2019-11-01	219305-20T	ND
2019-11-01	219305-21T	ND
2019-11-01	219305-22T	ND