Bromodichloromethane

US Army Fort Irwin

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

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	0.567 ppb	6	1	ND - 3.40 ppb
2015	0.470 ppb	27	2	ND - 12.0 ppb
2016	0.603 ppb	20	8	ND - 3.10 ppb
2017	1.11 ppb	16	10	ND - 3.90 ppb
2018	0.608 ppb	18	6	ND - 2.50 ppb
2019	1.20 ppb	2	1	ND - 2.40 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
2014-07-09	4790-009-0830	ND
2014-07-23	4790-605-1515	3.40 ppb
2014-07-23	4790-604-1700	ND
2014-07-23	4790-603-1605	ND
2014-07-23	4790-602-1535	ND
2014-07-23	4790-601-1455	ND
2015-01-29	4790-604-1000	ND
2015-01-29	4790-603-0945	ND
2015-01-29	4790-602-0915	ND
2015-01-29	4790-605-0800	ND
2015-01-29	4790-601-0745	ND
2015-04-23	4790-604-1245	ND
2015-04-23	4790-603-1000	ND
2015-04-23	4790-605-0935	0.690 ppb
2015-04-23	4790-602-1215	ND
2015-04-23	4790-601-0920	ND
2015-07-01	4790-001-1530	ND
2015-08-05	4790-603-1320	ND
2015-08-05	4790-605-1300	ND
2015-08-05	4790-602-1345	ND
2015-08-05	4790-601-1245	ND
2015-08-05	4790-604-1400	ND
2015-09-01	4790-002-1930	ND
2015-09-16	4790-003-1740	ND
2015-09-17	4790-009-1930	ND
2015-09-23	4790-012-1700	ND
2015-09-30	4790-013-1520	ND
2015-10-12	4790-602-0920	ND
2015-10-12	4790-603-0950	ND
2015-10-12	4790-604-1020	ND
2015-10-12	4790-605-0850	12.0 ppb
2015-10-12	4790-601-0830	ND
2015-11-11	4790-012-1600	ND
2016-01-27	4790-602-1115	ND
2016-01-27	4790-604-1040	ND
2016-01-27	4790-603-1230	ND
2016-01-27	4790-601-1320	ND
2016-01-27	4790-605-1300	ND
2016-04-20	4790-601-1325	3.10 ppb
2016-04-20	4790-604-1215	1.10 ppb
2016-04-20	4790-603-1300	2.20 ppb
2016-04-20	4790-603-1230	0.850 ppb
2016-04-20	4790-605-1345	1.60 ppb
2016-07-06	4790-019-0715	ND
2016-07-13	4790-019-0610	ND
2016-07-21	4790-019-0615	ND
2016-07-28	4790-019-0625	ND
2016-08-04	4790-019-0630	ND
2016-08-12	4790-019-0610	ND
2016-10-12	4790-604-0925	0.700 ppb
2016-10-12	4790-603-0815	1.70 ppb
2016-10-12	4790-602-0840	ND
2016-10-12	4790-601-0740	0.810 ppb
2017-01-11	4790-606-1312	2.00 ppb
2017-01-17	4790-602-0810	ND
2017-01-17	4790-601-0745	ND
2017-01-17	4790-603-0850	0.540 ppb
2017-04-11	4790-606-1340	2.70 ppb
2017-04-11	4790-602-1045	ND
2017-04-11	4790-603-1010	1.30 ppb
2017-04-11	4790-601-1110	1.50 ppb
2017-07-12	4790-606-1238	3.90 ppb
2017-07-21	4790-603-0940	1.000 ppb
2017-07-21	4790-602-1100	ND
2017-07-21	4790-601-0915	0.550 ppb
2017-10-12	4790-606-1405	3.50 ppb
2017-11-06	4790-603-1045	ND
2017-11-06	4790-602-1020	ND
2017-11-06	4790-601-1107	0.770 ppb
2018-01-16	4790-606-1345	2.10 ppb
2018-01-17	4790-603-1405	ND
2018-01-17	4790-601-1250	0.680 ppb
2018-01-17	4790-602-1502	ND
2018-05-25	4790-601-1235	ND
2018-05-30	4790-601-0735	ND
2018-06-12	4790-016-1105	ND
2018-06-14	4790-017-0939	ND
2018-07-10	4790-013-1235	ND
2018-07-10	4790-009-1145	ND
2018-07-10	4790-003-1400	ND
2018-07-10	4790-002-1021	ND
2018-07-10	4790-001-1045	ND
2018-07-19	4790-601-1240	0.970 ppb
2018-07-19	4790-606-1330	2.40 ppb
2018-07-23	4790-012-0845	ND
2018-10-25	4790-606-1335	2.30 ppb
2018-10-31	4790-606-1435	2.50 ppb
2019-06-11	4790-601-1500	ND
2019-11-26	4790-606-1048	2.40 ppb