Bromodichloromethane

Metropolitan Utilities District

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

325

Samples

Samples exceeding legal limit (MCL)

307

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	8.57 ppb	58	54	ND - 12.4 ppb
2015	9.69 ppb	52	50	ND - 19.0 ppb
2016	11.9 ppb	53	51	ND - 15.8 ppb
2017	9.67 ppb	61	52	ND - 24.5 ppb
2018	10.4 ppb	50	50	7.14 ppb - 15.4 ppb
2019	12.3 ppb	51	50	ND - 17.8 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
2014-01-08	294497	9.93 ppb
2014-02-04	283310	9.69 ppb
2014-02-04	283311	8.97 ppb
2014-02-04	283312	9.56 ppb
2014-02-04	283313	10.5 ppb
2014-02-04	283315	10.3 ppb
2014-02-04	283321	10.6 ppb
2014-02-11	287613	9.21 ppb
2014-02-11	287615	10.3 ppb
2014-02-11	287616	10.3 ppb
2014-02-11	287617	10.7 ppb
2014-02-11	287618	10.1 ppb
2014-02-11	287619	9.94 ppb
2014-04-08	293527	ND
2014-05-05	295287	10.3 ppb
2014-05-05	295288	7.00 ppb
2014-05-05	295289	6.86 ppb
2014-05-05	295290	8.76 ppb
2014-05-05	295291	8.16 ppb
2014-05-05	295284	6.68 ppb
2014-05-05	295285	7.07 ppb
2014-05-05	295286	8.15 ppb
2014-05-05	295280	6.80 ppb
2014-05-05	295281	8.29 ppb
2014-05-05	295282	7.02 ppb
2014-05-05	295283	7.22 ppb
2014-05-12	302599	8.40 ppb
2014-06-02	294498	ND
2014-07-08	309807	ND
2014-08-05	311990	11.2 ppb
2014-08-05	311991	10.9 ppb
2014-08-05	311980	10.2 ppb
2014-08-05	311981	12.4 ppb
2014-08-05	311982	12.1 ppb
2014-08-05	311983	11.3 ppb
2014-08-05	311984	11.0 ppb
2014-08-05	311985	10.6 ppb
2014-08-05	311986	11.4 ppb
2014-08-05	311987	12.2 ppb
2014-08-05	311988	12.1 ppb
2014-08-05	311989	12.1 ppb
2014-08-26	311210	2.65 ppb
2014-08-26	311212	11.7 ppb
2014-08-26	311213	4.92 ppb
2014-08-26	311214	ND
2014-09-02	324809	1.02 ppb
2014-11-03	332929	7.17 ppb
2014-11-03	332930	8.24 ppb
2014-11-03	332931	9.30 ppb
2014-11-03	332932	10.4 ppb
2014-11-03	332933	9.98 ppb
2014-11-03	332934	9.17 ppb
2014-11-03	332935	10.3 ppb
2014-11-03	332936	10.2 ppb
2014-11-03	332925	6.82 ppb
2014-11-03	332926	10.4 ppb
2014-11-03	332927	7.00 ppb
2014-11-03	332928	9.70 ppb
2015-02-02	346549	9.04 ppb
2015-02-02	346546	7.70 ppb
2015-02-02	346547	10.1 ppb
2015-02-02	346548	7.43 ppb
2015-02-02	346550	8.22 ppb
2015-02-02	346551	7.80 ppb
2015-02-02	346552	8.72 ppb
2015-02-02	346553	10.1 ppb
2015-02-02	346554	10.1 ppb
2015-02-02	346555	10.1 ppb
2015-02-02	346556	10.2 ppb
2015-02-02	346557	9.60 ppb
2015-04-07	353665	9.39 ppb
2015-04-07	353666	12.5 ppb
2015-04-07	353667	ND
2015-05-05	361728	7.87 ppb
2015-05-05	361729	7.76 ppb
2015-05-05	361731	7.60 ppb
2015-05-05	361732	8.36 ppb
2015-05-05	361733	7.54 ppb
2015-05-05	361736	7.76 ppb
2015-05-05	361737	8.16 ppb
2015-05-05	361738	7.80 ppb
2015-05-05	361739	8.27 ppb
2015-05-05	361730	7.56 ppb
2015-05-05	361734	8.48 ppb
2015-05-05	361735	7.46 ppb
2015-07-07	371752	ND
2015-08-03	374538	8.90 ppb
2015-08-03	374539	12.0 ppb
2015-08-03	374540	9.50 ppb
2015-08-03	374541	14.0 ppb
2015-08-03	374542	12.0 ppb
2015-08-03	374543	11.0 ppb
2015-08-03	374546	12.0 ppb
2015-08-03	374547	9.30 ppb
2015-08-03	374548	12.0 ppb
2015-08-03	374549	19.0 ppb
2015-08-03	374544	9.90 ppb
2015-08-03	374545	19.0 ppb
2015-11-04	393707	11.6 ppb
2015-11-04	393708	12.3 ppb
2015-11-04	393709	9.57 ppb
2015-11-04	393710	10.3 ppb
2015-11-04	393711	11.1 ppb
2015-11-04	393712	9.76 ppb
2015-11-04	393713	10.5 ppb
2015-11-04	393714	9.30 ppb
2015-11-04	393715	9.09 ppb
2015-11-04	393716	11.7 ppb
2015-11-04	393717	13.2 ppb
2015-11-04	393718	11.0 ppb
2016-02-01		10.5 ppb
2016-02-01		11.1 ppb
2016-02-01		10.9 ppb
2016-02-01		14.6 ppb
2016-02-01		10.8 ppb
2016-02-01		12.2 ppb
2016-02-01		13.8 ppb
2016-02-01		9.72 ppb
2016-02-01		14.3 ppb
2016-02-01		12.6 ppb
2016-02-01		13.9 ppb
2016-02-01		14.4 ppb
2016-04-04		ND
2016-04-18		7.67 ppb
2016-04-18		10.5 ppb
2016-05-02		12.7 ppb
2016-05-02		13.0 ppb
2016-05-02		12.8 ppb
2016-05-02		10.6 ppb
2016-05-02		10.5 ppb
2016-05-02		13.2 ppb
2016-05-02		12.9 ppb
2016-05-02		12.8 ppb
2016-05-02		12.5 ppb
2016-05-02		12.8 ppb
2016-05-02		13.3 ppb
2016-05-02		11.5 ppb
2016-05-02		11.8 ppb
2016-07-25		ND
2016-08-02		12.7 ppb
2016-08-02		15.3 ppb
2016-08-02		15.8 ppb
2016-08-02		15.6 ppb
2016-08-02		15.6 ppb
2016-08-02		13.5 ppb
2016-08-02		14.0 ppb
2016-08-02		13.8 ppb
2016-08-02		12.2 ppb
2016-08-02		13.8 ppb
2016-08-02		13.8 ppb
2016-08-02		13.0 ppb
2016-11-07		10.6 ppb
2016-11-07		11.6 ppb
2016-11-07		11.6 ppb
2016-11-07		11.4 ppb
2016-11-07		11.0 ppb
2016-11-07		11.0 ppb
2016-11-07		11.5 ppb
2016-11-07		11.1 ppb
2016-11-07		11.2 ppb
2016-11-07		11.7 ppb
2016-11-07		11.0 ppb
2016-11-07		11.0 ppb
2017-02-07		12.2 ppb
2017-02-07		11.6 ppb
2017-02-07		14.9 ppb
2017-02-07		12.2 ppb
2017-02-07		18.6 ppb
2017-02-07		11.4 ppb
2017-02-07		15.4 ppb
2017-02-07		10.5 ppb
2017-02-07		13.4 ppb
2017-02-07		10.8 ppb
2017-02-07		12.6 ppb
2017-02-07		10.2 ppb
2017-04-11		ND
2017-04-11		ND
2017-04-11		ND
2017-04-11		ND
2017-04-11		9.35 ppb
2017-04-17		8.97 ppb
2017-04-17		7.83 ppb
2017-05-02		9.83 ppb
2017-05-02		9.69 ppb
2017-05-02		10.4 ppb
2017-05-02		9.53 ppb
2017-05-02		9.56 ppb
2017-05-02		8.27 ppb
2017-05-02		9.89 ppb
2017-05-02		9.54 ppb
2017-05-02		10.3 ppb
2017-05-02		10.2 ppb
2017-05-15		24.5 ppb
2017-05-15		13.1 ppb
2017-06-05		0.915 ppb
2017-06-05		ND
2017-06-05		ND
2017-06-05		ND
2017-06-05		ND
2017-08-07		13.3 ppb
2017-08-07		10.4 ppb
2017-08-07		10.8 ppb
2017-08-07		14.6 ppb
2017-08-07		10.3 ppb
2017-08-07		11.4 ppb
2017-08-07		11.9 ppb
2017-08-07		10.1 ppb
2017-08-07		14.7 ppb
2017-08-07		9.88 ppb
2017-08-07		10.3 ppb
2017-08-07		10.6 ppb
2017-09-19		ND
2017-11-07		14.9 ppb
2017-11-07		11.0 ppb
2017-11-07		10.2 ppb
2017-11-07		11.3 ppb
2017-11-07		10.1 ppb
2017-11-07		10.5 ppb
2017-11-07		9.89 ppb
2017-11-07		10.7 ppb
2017-11-07		13.1 ppb
2017-11-07		10.00 ppb
2017-11-07		12.1 ppb
2017-11-07		12.4 ppb
2018-02-06	534089	12.0 ppb
2018-02-06	534090	8.03 ppb
2018-02-06	534091	7.46 ppb
2018-02-06	534092	7.42 ppb
2018-02-06	534093	9.82 ppb
2018-02-06	534094	7.89 ppb
2018-02-06	534095	8.85 ppb
2018-02-06	534096	8.60 ppb
2018-02-06	534097	10.2 ppb
2018-02-06	534098	11.4 ppb
2018-02-06	534099	12.3 ppb
2018-02-06	534100	8.29 ppb
2018-05-07	549814	12.3 ppb
2018-05-07	549815	11.0 ppb
2018-05-07	549816	13.2 ppb
2018-05-07	549817	9.10 ppb
2018-05-07	549818	9.85 ppb
2018-05-07	549819	8.84 ppb
2018-05-07	549820	10.4 ppb
2018-05-07	549821	10.9 ppb
2018-05-07	549822	11.4 ppb
2018-05-07	549823	14.2 ppb
2018-05-07	549824	11.1 ppb
2018-05-07	549825	11.3 ppb
2018-05-14	542539	9.73 ppb
2018-05-14	542540	9.59 ppb
2018-08-08	567019	15.4 ppb
2018-08-08	567020	9.59 ppb
2018-08-08	567021	11.2 ppb
2018-08-08	567022	10.5 ppb
2018-08-08	567023	10.3 ppb
2018-08-08	567024	10.9 ppb
2018-08-08	567025	10.4 ppb
2018-08-08	567026	11.2 ppb
2018-08-08	567027	10.6 ppb
2018-08-08	567028	13.8 ppb
2018-08-08	567029	10.4 ppb
2018-08-08	567030	10.2 ppb
2018-11-06	583374	12.7 ppb
2018-11-06	583375	8.85 ppb
2018-11-06	583376	13.0 ppb
2018-11-06	583377	7.39 ppb
2018-11-06	583378	12.4 ppb
2018-11-06	583379	7.35 ppb
2018-11-06	583380	12.3 ppb
2018-11-06	583381	7.14 ppb
2018-11-06	583382	10.3 ppb
2018-11-06	583383	9.11 ppb
2018-11-06	583384	9.92 ppb
2018-11-06	583385	11.9 ppb
2019-02-05	595236	9.12 ppb
2019-02-05	595237	9.87 ppb
2019-02-05	595238	10.2 ppb
2019-02-05	595239	11.4 ppb
2019-02-05	595240	9.90 ppb
2019-02-05	595241	11.9 ppb
2019-02-05	595242	11.7 ppb
2019-02-05	595243	11.6 ppb
2019-02-05	595244	12.1 ppb
2019-02-05	595245	12.1 ppb
2019-02-05	595246	10.2 ppb
2019-02-05	595247	11.9 ppb
2019-04-02	604245	11.4 ppb
2019-04-22	604810	12.4 ppb
2019-05-07	600564	9.36 ppb
2019-05-07	600565	10.1 ppb
2019-05-07	600566	13.8 ppb
2019-05-07	600567	14.6 ppb
2019-05-07	600568	15.5 ppb
2019-05-07	600569	15.3 ppb
2019-05-07	600570	14.7 ppb
2019-05-07	600571	14.2 ppb
2019-05-07	600572	15.1 ppb
2019-05-07	600573	15.7 ppb
2019-05-07	600574	16.1 ppb
2019-05-07	600575	14.7 ppb
2019-06-10	604811	ND
2019-08-06	622448	13.1 ppb
2019-08-06	622449	17.7 ppb
2019-08-06	622450	17.8 ppb
2019-08-06	622451	12.8 ppb
2019-08-06	622452	11.3 ppb
2019-08-06	622453	9.89 ppb
2019-08-06	622454	10.9 ppb
2019-08-06	622455	10.3 ppb
2019-08-06	622456	12.3 ppb
2019-08-06	622457	11.2 ppb
2019-08-06	622458	11.9 ppb
2019-08-06	622459	10.7 ppb
2019-11-05	644378	10.4 ppb
2019-11-05	644379	10.3 ppb
2019-11-05	644380	14.0 ppb
2019-11-05	644381	15.2 ppb
2019-11-05	644382	11.7 ppb
2019-11-05	644383	13.7 ppb
2019-11-05	644384	10.2 ppb
2019-11-05	644385	10.1 ppb
2019-11-05	644386	15.5 ppb
2019-11-05	644387	14.4 ppb
2019-11-05	644388	11.7 ppb
2019-11-05	644389	14.3 ppb