Dibromochloromethane

City of Tacoma

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

347

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	0.0677 ppb	64	7	ND - 0.790 ppb
2015	0.648 ppb	55	33	ND - 2.70 ppb
2016	0.252 ppb	61	21	ND - 1.69 ppb
2017	0.0172 ppb	60	2	ND - 0.520 ppb
2018	ND	56	0	ND
2019	0.0435 ppb	51	4	ND - 0.600 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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
2014-01-07	90631	0.530 ppb
2014-01-07	90626	ND
2014-01-07	90628	ND
2014-01-07	90632	ND
2014-01-07	90629	ND
2014-01-07	90640	ND
2014-01-07	90637	0.560 ppb
2014-01-07	90638	ND
2014-01-07	90633	0.790 ppb
2014-01-07	90636	0.760 ppb
2014-01-07	90634	0.510 ppb
2014-01-07	90630	ND
2014-01-07	90639	ND
2014-01-07	90635	0.680 ppb
2014-01-07	90627	ND
2014-04-14	70467	ND
2014-04-14	70463	ND
2014-04-14	70469	ND
2014-04-14	70461	ND
2014-04-14	70462	ND
2014-04-14	70468	ND
2014-04-14	70466	ND
2014-04-14	70470	ND
2014-04-14	70471	ND
2014-04-15	70473	ND
2014-04-15	70465	ND
2014-04-15	70464	ND
2014-04-15	70474	ND
2014-04-15	70472	ND
2014-04-15	70475	ND
2014-07-14	70685	ND
2014-07-14	70688	ND
2014-07-14	70686	ND
2014-07-14	70683	ND
2014-07-14	70681	ND
2014-07-14	70687	ND
2014-07-14	70690	ND
2014-07-14	70684	ND
2014-07-14	70689	ND
2014-07-14	70691	ND
2014-07-14	70682	0.500 ppb
2014-07-15	70692	ND
2014-07-15	70695	ND
2014-07-15	70693	ND
2014-07-15	70694	ND
2014-10-06	00258	ND
2014-10-06	00254	ND
2014-10-06	00253	ND
2014-10-06	00261	ND
2014-10-06	00257	ND
2014-10-06	00255	ND
2014-10-06	00252	ND
2014-10-06	00259	ND
2014-10-06	00260	ND
2014-10-06	00256	ND
2014-10-07	00264	ND
2014-10-07	00265	ND
2014-10-07	00266	ND
2014-10-07	00262	ND
2014-10-07	00263	ND
2014-11-13	29191	ND
2014-11-14	29192	ND
2014-11-18	30352	ND
2014-12-02	34852	ND
2015-01-13	50739	ND
2015-01-13	50738	ND
2015-01-13	50737	ND
2015-01-13	50736	ND
2015-01-13	50735	ND
2015-01-14	50733	ND
2015-01-14	50732	ND
2015-01-14	50731	ND
2015-01-14	50730	ND
2015-01-14	50729	ND
2015-01-14	50728	ND
2015-01-14	50727	ND
2015-01-14	50726	ND
2015-01-14	50734	ND
2015-01-14	50725	ND
2015-06-08	27944	ND
2015-07-07	90421	0.890 ppb
2015-07-07	90423	ND
2015-07-08	90420	1.40 ppb
2015-07-08	90425	0.760 ppb
2015-07-08	90427	2.70 ppb
2015-07-08	90422	0.940 ppb
2015-07-08	90424	0.600 ppb
2015-07-08	90426	1.000 ppb
2015-08-05	85793	ND
2015-10-13	50409	0.650 ppb
2015-10-13	50413	0.640 ppb
2015-10-13	50412	0.570 ppb
2015-10-13	50407	1.40 ppb
2015-10-13	50410	0.700 ppb
2015-10-13	50399	1.000 ppb
2015-10-13	50404	0.910 ppb
2015-10-13	50406	2.50 ppb
2015-10-13	50401	1.20 ppb
2015-10-13	50403	0.580 ppb
2015-10-13	50400	0.940 ppb
2015-10-13	50405	2.70 ppb
2015-10-13	50408	2.20 ppb
2015-10-13	50402	0.560 ppb
2015-10-14	50411	ND
2015-12-01	38661	0.880 ppb
2015-12-01	38661	0.880 ppb
2015-12-01	38661	0.880 ppb
2015-12-01	38661	0.880 ppb
2015-12-02	38662	1.10 ppb
2015-12-02	38662	1.10 ppb
2015-12-02	38662	1.10 ppb
2015-12-02	38662	1.10 ppb
2015-12-03	38663	0.720 ppb
2015-12-03	38663	0.720 ppb
2015-12-03	38663	0.720 ppb
2015-12-03	38663	0.720 ppb
2015-12-07	41682	ND
2015-12-07	41681	ND
2015-12-08	41683	ND
2016-01-04		ND
2016-01-04		ND
2016-01-04		ND
2016-01-04		ND
2016-01-05		0.560 ppb
2016-01-05		ND
2016-01-05		ND
2016-01-05		ND
2016-01-05		ND
2016-01-05		ND
2016-01-06		0.690 ppb
2016-01-06		0.800 ppb
2016-01-06		ND
2016-01-06		ND
2016-01-06		ND
2016-04-04		ND
2016-04-04		1.10 ppb
2016-04-04		ND
2016-04-04		ND
2016-04-04		ND
2016-04-04		ND
2016-04-04		ND
2016-04-04		0.740 ppb
2016-04-04		ND
2016-04-04		0.930 ppb
2016-04-04		ND
2016-04-04		0.960 ppb
2016-04-04		ND
2016-04-05		ND
2016-04-05		ND
2016-04-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-07-06		ND
2016-10-03		0.580 ppb
2016-10-03		0.630 ppb
2016-10-03		1.69 ppb
2016-10-03		0.600 ppb
2016-10-03		0.590 ppb
2016-10-03		0.620 ppb
2016-10-03		0.680 ppb
2016-10-03		0.610 ppb
2016-10-03		0.590 ppb
2016-10-03		0.680 ppb
2016-10-04		ND
2016-10-04		0.580 ppb
2016-10-04		0.550 ppb
2016-10-04		0.630 ppb
2016-10-04		0.560 ppb
2017-01-03		ND
2017-01-03		ND
2017-01-03		ND
2017-01-03		ND
2017-01-03		ND
2017-01-03		ND
2017-01-03		ND
2017-01-03		ND
2017-01-03		ND
2017-01-03		ND
2017-01-03		0.520 ppb
2017-01-03		ND
2017-01-03		ND
2017-01-03		ND
2017-01-03		ND
2017-04-03		ND
2017-04-03		ND
2017-04-03		ND
2017-04-03		ND
2017-04-03		ND
2017-04-03		ND
2017-04-03		ND
2017-04-03		ND
2017-04-03		ND
2017-04-03		ND
2017-04-03		ND
2017-04-04		ND
2017-04-04		ND
2017-04-04		ND
2017-04-05		ND
2017-07-05		ND
2017-07-05		ND
2017-07-05		ND
2017-07-05		ND
2017-07-05		ND
2017-07-05		ND
2017-07-05		ND
2017-07-05		ND
2017-07-05		ND
2017-07-06		ND
2017-07-06		ND
2017-07-06		ND
2017-07-06		ND
2017-07-06		ND
2017-07-06		ND
2017-10-02		ND
2017-10-02		ND
2017-10-02		ND
2017-10-02		ND
2017-10-02		0.510 ppb
2017-10-02		ND
2017-10-02		ND
2017-10-02		ND
2017-10-02		ND
2017-10-02		ND
2017-10-02		ND
2017-10-02		ND
2017-10-02		ND
2017-10-03		ND
2017-10-03		ND
2018-01-02		ND
2018-01-02		ND
2018-01-02		ND
2018-01-02		ND
2018-01-02		ND
2018-01-02		ND
2018-01-02		ND
2018-01-02		ND
2018-01-02		ND
2018-01-02		ND
2018-01-02		ND
2018-01-03		ND
2018-01-03		ND
2018-01-03		ND
2018-01-03		ND
2018-04-02		ND
2018-04-02		ND
2018-04-02		ND
2018-04-02		ND
2018-04-02		ND
2018-04-02		ND
2018-04-02		ND
2018-04-02		ND
2018-04-02		ND
2018-04-02		ND
2018-04-02		ND
2018-04-02		ND
2018-04-03		ND
2018-04-03		ND
2018-07-02		ND
2018-07-02		ND
2018-07-02		ND
2018-07-02		ND
2018-07-02		ND
2018-07-02		ND
2018-07-02		ND
2018-07-03		ND
2018-07-03		ND
2018-07-03		ND
2018-07-03		ND
2018-07-03		ND
2018-07-03		ND
2018-07-03		ND
2018-07-03		ND
2018-10-30		ND
2018-10-30		ND
2018-10-30		ND
2018-10-30		ND
2018-10-30		ND
2018-10-31		ND
2018-10-31		ND
2018-10-31		ND
2018-10-31		ND
2018-10-31		ND
2018-10-31		ND
2018-10-31		ND
2019-01-02		ND
2019-01-14		ND
2019-01-14		ND
2019-01-14		ND
2019-01-14		ND
2019-01-14		ND
2019-01-14		ND
2019-01-14		ND
2019-01-14		ND
2019-01-14		ND
2019-01-14		ND
2019-01-14		ND
2019-01-15		ND
2019-04-01		ND
2019-04-01		ND
2019-04-01		ND
2019-04-01		ND
2019-04-01		ND
2019-04-01		ND
2019-04-01		ND
2019-04-01		ND
2019-04-01		ND
2019-04-01		ND
2019-04-01		ND
2019-04-03		ND
2019-07-08		ND
2019-07-08		ND
2019-07-08		ND
2019-07-08		ND
2019-07-08		ND
2019-07-08		ND
2019-07-08		ND
2019-07-08		ND
2019-07-08		ND
2019-07-08		ND
2019-07-08		ND
2019-07-08		ND
2019-07-24		ND
2019-10-01		0.560 ppb
2019-10-01		0.560 ppb
2019-10-01		0.600 ppb
2019-10-01		ND
2019-10-02		ND
2019-10-02		ND
2019-10-02		ND
2019-10-02		ND
2019-10-02		ND
2019-10-02		0.500 ppb
2019-10-02		ND
2019-10-02		ND
2019-12-03		ND