Bromoform

City of Redmond 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

199

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	0.161 ppb	31	7	ND - 0.800 ppb
2015	0.179 ppb	32	7	ND - 1.43 ppb
2016	0.111 ppb	35	6	ND - 0.750 ppb
2017	0.141 ppb	33	7	ND - 0.840 ppb
2018	0.198 ppb	32	8	ND - 1.04 ppb
2019	0.143 ppb	36	7	ND - 0.922 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
2014-01-08	00370	0.700 ppb
2014-01-08	00365	ND
2014-01-08	00366	ND
2014-01-08	00364	ND
2014-01-08	00363	ND
2014-01-08	00367	ND
2014-01-08	00368	ND
2014-04-09	06217	0.600 ppb
2014-04-09	06216	ND
2014-04-09	06218	ND
2014-04-09	06215	ND
2014-04-09	06214	ND
2014-04-09	06212	ND
2014-04-09	06211	ND
2014-04-09	06213	0.800 ppb
2014-07-09	12233	0.800 ppb
2014-07-09	12234	ND
2014-07-09	12235	ND
2014-07-09	12236	ND
2014-07-09	12238	ND
2014-07-09	12232	ND
2014-07-09	12237	0.600 ppb
2014-07-09	12231	ND
2014-10-08	18870	ND
2014-10-08	18869	0.800 ppb
2014-10-08	18874	ND
2014-10-08	18868	ND
2014-10-08	18872	ND
2014-10-08	18873	0.700 ppb
2014-10-08	18867	ND
2014-10-08	18871	ND
2015-01-07	15208	ND
2015-01-07	15207	ND
2015-01-07	15203	0.610 ppb
2015-01-07	15202	ND
2015-01-07	15206	ND
2015-01-07	15201	ND
2015-01-07	15204	ND
2015-01-07	15205	ND
2015-04-08	88707	0.640 ppb
2015-04-08	88708	ND
2015-04-08	88706	ND
2015-04-08	88705	ND
2015-04-08	88704	ND
2015-04-08	88703	0.590 ppb
2015-04-08	88701	ND
2015-04-08	88702	ND
2015-07-08	37607	0.520 ppb
2015-07-08	37608	ND
2015-07-08	37606	ND
2015-07-08	37605	ND
2015-07-08	37604	ND
2015-07-08	37603	0.600 ppb
2015-07-08	37601	ND
2015-07-08	37602	ND
2015-10-07	18907	1.35 ppb
2015-10-07	18908	ND
2015-10-07	18906	ND
2015-10-07	18905	ND
2015-10-07	18904	ND
2015-10-07	18903	1.43 ppb
2015-10-07	18901	ND
2015-10-07	18902	ND
2016-01-06		0.520 ppb
2016-01-06		ND
2016-01-06		ND
2016-01-06		ND
2016-01-06		ND
2016-01-06		ND
2016-01-06		ND
2016-01-06		ND
2016-04-08		ND
2016-04-08		0.600 ppb
2016-04-08		ND
2016-04-08		ND
2016-04-08		0.750 ppb
2016-04-08		ND
2016-04-08		ND
2016-04-08		ND
2016-07-06		ND
2016-07-06		0.600 ppb
2016-07-06		ND
2016-07-06		0.650 ppb
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-11		ND
2016-07-11		ND
2016-07-11		ND
2016-10-04		ND
2016-10-04		ND
2016-10-04		ND
2016-10-04		0.750 ppb
2016-10-04		ND
2016-10-04		ND
2016-10-04		ND
2016-10-04		ND
2017-01-11		ND
2017-01-11		ND
2017-01-11		ND
2017-01-11		ND
2017-01-11		ND
2017-01-11		0.570 ppb
2017-01-11		ND
2017-01-11		ND
2017-04-11		0.680 ppb
2017-04-11		0.600 ppb
2017-04-11		ND
2017-04-11		ND
2017-04-11		ND
2017-04-11		ND
2017-04-11		ND
2017-04-11		ND
2017-07-05		ND
2017-07-05		ND
2017-07-05		0.730 ppb
2017-07-05		ND
2017-07-05		ND
2017-07-05		0.550 ppb
2017-07-05		ND
2017-07-05		ND
2017-10-11		ND
2017-10-11		0.840 ppb
2017-10-11		ND
2017-10-11		ND
2017-10-11		0.690 ppb
2017-10-11		ND
2017-10-11		ND
2017-10-11		ND
2017-11-29		ND
2018-01-10		ND
2018-01-10		ND
2018-01-10		0.920 ppb
2018-01-10		ND
2018-01-10		ND
2018-01-10		ND
2018-01-10		ND
2018-01-10		0.620 ppb
2018-04-04		ND
2018-04-04		ND
2018-04-04		0.760 ppb
2018-04-04		ND
2018-04-04		ND
2018-04-04		ND
2018-04-04		ND
2018-04-04		0.600 ppb
2018-07-03		ND
2018-07-03		ND
2018-07-03		0.890 ppb
2018-07-03		ND
2018-07-03		ND
2018-07-03		ND
2018-07-03		ND
2018-07-03		0.680 ppb
2018-10-03		ND
2018-10-03		ND
2018-10-03		1.04 ppb
2018-10-03		ND
2018-10-03		ND
2018-10-03		ND
2018-10-03		ND
2018-10-03		0.830 ppb
2019-01-09		ND
2019-01-09		ND
2019-01-09		0.760 ppb
2019-01-09		ND
2019-01-09		ND
2019-01-09		ND
2019-01-09		ND
2019-01-09		ND
2019-04-03		ND
2019-04-03		ND
2019-04-03		0.710 ppb
2019-04-03		ND
2019-04-03		ND
2019-04-03		ND
2019-04-03		ND
2019-04-03		0.570 ppb
2019-07-01		ND
2019-07-01		ND
2019-07-01		0.747 ppb
2019-07-01		ND
2019-07-01		ND
2019-07-01		ND
2019-07-01		ND
2019-07-01		0.608 ppb
2019-07-09		ND
2019-07-09		ND
2019-07-09		ND
2019-07-09		ND
2019-10-02		ND
2019-10-02		ND
2019-10-02		0.848 ppb
2019-10-02		ND
2019-10-02		ND
2019-10-02		ND
2019-10-02		ND
2019-10-02		0.922 ppb