Bromodichloromethane

City of Puyallup

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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

188

Samples

Samples exceeding legal limit (MCL)

103

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	0.492 ppb	38	14	ND - 3.40 ppb
2015	0.747 ppb	32	21	ND - 2.10 ppb
2016	0.666 ppb	32	18	ND - 3.20 ppb
2017	0.615 ppb	33	17	ND - 2.80 ppb
2018	0.597 ppb	33	20	ND - 1.50 ppb
2019	0.891 ppb	20	13	ND - 2.81 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-02-11	73328	ND
2014-02-11	73326	1.40 ppb
2014-02-11	73324	ND
2014-02-11	73330	ND
2014-02-11	73331	ND
2014-02-11	73329	ND
2014-02-11	73327	1.10 ppb
2014-02-11	73325	0.900 ppb
2014-05-06	73518	ND
2014-05-06	73516	ND
2014-05-06	73517	ND
2014-05-06	73521	0.600 ppb
2014-05-06	73514	ND
2014-05-06	73515	1.30 ppb
2014-05-06	73519	0.700 ppb
2014-05-06	73520	0.600 ppb
2014-07-08	73731	ND
2014-07-08	73733	ND
2014-07-08	73732	ND
2014-07-09	73750	ND
2014-07-09	73752	ND
2014-07-09	73751	ND
2014-08-08	73949	ND
2014-08-08	73948	ND
2014-08-08	73952	3.40 ppb
2014-08-08	73950	ND
2014-08-08	73953	2.10 ppb
2014-08-08	73954	0.700 ppb
2014-08-08	73951	ND
2014-08-08	73955	ND
2014-11-17	74516	ND
2014-11-17	74515	ND
2014-11-17	74519	1.50 ppb
2014-11-17	74518	ND
2014-11-17	74520	1.60 ppb
2014-11-17	74521	ND
2014-11-17	74514	1.20 ppb
2014-11-17	74517	1.60 ppb
2015-02-10	74752	ND
2015-02-10	74749	0.600 ppb
2015-02-10	74750	0.900 ppb
2015-02-10	74747	0.900 ppb
2015-02-10	74753	1.40 ppb
2015-02-10	74751	ND
2015-02-10	74746	ND
2015-02-10	74748	1.70 ppb
2015-05-07	74983	ND
2015-05-07	74981	0.600 ppb
2015-05-07	74977	1.40 ppb
2015-05-07	74980	1.30 ppb
2015-05-07	74982	0.600 ppb
2015-05-07	74978	ND
2015-05-07	74979	ND
2015-05-07	74976	1.30 ppb
2015-08-05	75262	ND
2015-08-05	75261	0.500 ppb
2015-08-05	75257	1.50 ppb
2015-08-05	75263	1.30 ppb
2015-08-05	75259	0.600 ppb
2015-08-05	75260	ND
2015-08-05	75258	ND
2015-08-05	75256	2.10 ppb
2015-11-10	75671	ND
2015-11-10	75670	0.800 ppb
2015-11-10	75675	1.30 ppb
2015-11-10	75674	1.000 ppb
2015-11-10	75668	ND
2015-11-10	75673	0.900 ppb
2015-11-10	75672	1.40 ppb
2015-11-10	75669	1.80 ppb
2016-02-02		0.600 ppb
2016-02-02		ND
2016-02-02		0.600 ppb
2016-02-02		1.000 ppb
2016-02-02		ND
2016-02-02		ND
2016-02-02		ND
2016-02-02		1.70 ppb
2016-05-04		0.600 ppb
2016-05-04		0.800 ppb
2016-05-04		ND
2016-05-04		1.70 ppb
2016-05-04		1.30 ppb
2016-05-04		1.10 ppb
2016-05-04		ND
2016-05-04		ND
2016-08-09		ND
2016-08-09		3.20 ppb
2016-08-09		1.30 ppb
2016-08-09		1.000 ppb
2016-08-09		ND
2016-08-09		1.10 ppb
2016-08-09		0.800 ppb
2016-08-09		ND
2016-11-14		0.800 ppb
2016-11-14		1.000 ppb
2016-11-14		1.70 ppb
2016-11-14		ND
2016-11-14		ND
2016-11-14		1.000 ppb
2016-11-14		ND
2016-11-14		ND
2017-02-06		ND
2017-02-06		0.500 ppb
2017-02-06		ND
2017-02-06		1.50 ppb
2017-02-06		ND
2017-02-06		ND
2017-02-06		ND
2017-02-06		ND
2017-05-25		1.30 ppb
2017-05-25		0.900 ppb
2017-05-25		1.60 ppb
2017-05-25		0.700 ppb
2017-05-25		ND
2017-05-25		ND
2017-05-25		0.800 ppb
2017-05-25		ND
2017-08-01		0.900 ppb
2017-08-01		2.80 ppb
2017-08-01		ND
2017-08-01		ND
2017-08-01		ND
2017-08-01		1.90 ppb
2017-08-01		0.900 ppb
2017-08-01		0.300 ppb
2017-11-13		1.000 ppb
2017-11-13		2.10 ppb
2017-11-13		ND
2017-11-13		1.40 ppb
2017-11-13		ND
2017-11-13		0.600 ppb
2017-11-13		1.10 ppb
2017-11-13		ND
2017-12-28		ND
2018-02-06		1.40 ppb
2018-02-06		ND
2018-02-06		0.700 ppb
2018-02-06		0.900 ppb
2018-02-06		1.10 ppb
2018-02-06		1.30 ppb
2018-02-06		0.600 ppb
2018-02-06		ND
2018-05-03		1.40 ppb
2018-05-03		ND
2018-05-03		0.800 ppb
2018-05-03		1.50 ppb
2018-05-03		0.800 ppb
2018-05-03		ND
2018-05-03		0.500 ppb
2018-05-03		ND
2018-07-31		ND
2018-08-07		1.28 ppb
2018-08-07		ND
2018-08-07		ND
2018-08-07		ND
2018-08-07		0.740 ppb
2018-08-07		0.570 ppb
2018-08-07		ND
2018-08-07		ND
2018-11-27		1.48 ppb
2018-11-27		ND
2018-11-27		ND
2018-11-27		0.970 ppb
2018-11-27		1.23 ppb
2018-11-27		0.710 ppb
2018-11-27		0.780 ppb
2018-11-27		0.950 ppb
2019-02-05		1.54 ppb
2019-02-05		ND
2019-02-05		ND
2019-02-05		0.980 ppb
2019-02-05		0.980 ppb
2019-02-05		ND
2019-02-05		ND
2019-02-05		ND
2019-05-09		1.36 ppb
2019-05-09		1.68 ppb
2019-05-09		ND
2019-05-09		0.630 ppb
2019-05-09		1.37 ppb
2019-05-09		1.02 ppb
2019-05-09		0.530 ppb
2019-05-09		ND
2019-08-01		2.62 ppb
2019-08-01		1.02 ppb
2019-11-06		1.27 ppb
2019-11-06		2.81 ppb