Bromoform

City of Exeter

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
2013	N/A	0	0	N/A
2014	0.283 ppb	12	1	ND - 3.40 ppb
2015	0.550 ppb	12	3	ND - 2.30 ppb
2016	ND	16	0	ND
2017	0.0688 ppb	16	1	ND - 1.10 ppb
2018	0.268 ppb	8	3	ND - 0.920 ppb
2019	0.0609 ppb	22	2	ND - 0.730 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
2014-02-19	5810-900-0951	ND
2014-02-19	5810-903-1020	ND
2014-02-19	5810-901-0940	ND
2014-02-19	5810-902-1005	3.40 ppb
2014-05-21	5810-903-1010	ND
2014-05-21	5810-900-1022	ND
2014-05-21	5810-902-0925	ND
2014-05-21	5810-901-0944	ND
2014-08-20	5810-903-0920	ND
2014-08-20	5810-900-0823	ND
2014-08-20	5810-901-0834	ND
2014-08-20	5810-902-0806	ND
2015-05-15	5810-900-0854	2.30 ppb
2015-05-15	5810-903-0915	2.30 ppb
2015-05-15	5810-902-0905	2.00 ppb
2015-05-15	5810-901-0845	ND
2015-08-05	5810-900-0800	ND
2015-08-05	5810-903-0855	ND
2015-08-05	5810-902-0820	ND
2015-08-05	5810-901-0735	ND
2015-12-23	5810-900-0840	ND
2015-12-23	5810-903-0910	ND
2015-12-23	5810-902-0854	ND
2015-12-23	5810-901-0823	ND
2016-02-12	5810-902-0845	ND
2016-02-12	5810-903-0910	ND
2016-02-12	5810-901-0810	ND
2016-02-12	5810-900-0829	ND
2016-04-29	5810-901-0940	ND
2016-04-29	5810-902-0900	ND
2016-04-29	5810-900-0835	ND
2016-04-29	5810-903-0920	ND
2016-08-25	5810-903-0940	ND
2016-08-25	5810-900-0910	ND
2016-08-25	5810-901-0855	ND
2016-08-25	5810-902-0924	ND
2016-11-02	5810-903-1010	ND
2016-11-02	5810-900-0940	ND
2016-11-02	5810-901-0926	ND
2016-11-02	5810-902-0956	ND
2017-01-24	5810-903-0952	ND
2017-01-24	5810-902-0938	ND
2017-01-24	5810-900-0923	ND
2017-01-24	5810-901-0910	ND
2017-05-05	5810-900-0823	ND
2017-05-05	5810-901-0852	ND
2017-05-05	5810-902-0840	ND
2017-05-05	5810-903-0906	ND
2017-08-10	5810-900-0858	ND
2017-08-10	5810-902-0914	ND
2017-08-10	5810-901-0835	ND
2017-08-10	5810-903-0929	ND
2017-11-15	5810-900-0909	1.10 ppb
2017-11-15	5810-901-0848	ND
2017-11-15	5810-903-0928	ND
2017-11-15	5810-902-0912	ND
2018-08-28	5802-903-1230	ND
2018-08-28	5802-902-0000	ND
2018-08-28	5802-901-1115	ND
2018-08-28	5802-900-1130	ND
2018-10-17	5802-903-1030	0.920 ppb
2018-10-17	5802-901-1015	0.700 ppb
2018-10-17	5802-900-1005	0.520 ppb
2018-10-17	5802-902-1040	ND
2019-01-28	5802-900-1208	ND
2019-01-28	5802-901-1145	ND
2019-01-28	5802-903-1055	0.610 ppb
2019-01-28	5802-902-1045	0.730 ppb
2019-04-23	5802-903-0825	ND
2019-04-23	5802-900-0911	ND
2019-04-23	5802-901-0910	ND
2019-04-23	5802-902-0815	ND
2019-06-21	5802-007-1020	ND
2019-06-21	5802-012-0940	ND
2019-06-21	5802-014-1000	ND
2019-06-21	5802-016-1105	ND
2019-06-21	5802-004-1035	ND
2019-06-21	5802-002-1050	ND
2019-07-10	5802-903-0950	ND
2019-07-10	5802-902-0845	ND
2019-07-10	5802-900-1005	ND
2019-07-10	5802-901-0855	ND
2019-10-15	5802-903-0910	ND
2019-10-15	5802-902-0900	ND
2019-10-15	5802-900-1005	ND
2019-10-15	5802-901-0950	ND