Bromodichloromethane

Ontario Municipal Utilities Company

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

233

Samples

Samples exceeding legal limit (MCL)

143

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	4.72 ppb	63	31	ND - 13.0 ppb
2015	6.08 ppb	33	27	ND - 18.0 ppb
2016	3.82 ppb	25	14	ND - 20.0 ppb
2017	4.00 ppb	47	24	ND - 15.0 ppb
2018	8.09 ppb	32	25	ND - 17.0 ppb
2019	7.89 ppb	33	22	ND - 22.0 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
2014-02-20	4790-601-0820	10.00 ppb
2014-02-20	4790-602-0745	ND
2014-02-20	4790-603-0855	10.00 ppb
2014-02-20	4790-604-1125	10.00 ppb
2014-02-20	4790-605-1105	9.60 ppb
2014-02-20	4790-606-0800	10.00 ppb
2014-02-20	4790-607-1115	9.90 ppb
2014-02-20	4790-608-0840	10.00 ppb
2014-05-21	4790-601-0820	9.00 ppb
2014-05-21	4790-602-0729	1.20 ppb
2014-05-21	4790-603-0855	9.00 ppb
2014-05-21	4790-604-1145	8.90 ppb
2014-05-21	4790-605-1115	8.40 ppb
2014-05-21	4790-606-0800	8.90 ppb
2014-05-21	4790-607-1130	8.50 ppb
2014-05-21	4790-608-0840	8.70 ppb
2014-07-11	4790-017-0925	ND
2014-07-11	4790-020-1020	ND
2014-07-11	4790-045-0825	ND
2014-07-14	4790-046-0800	ND
2014-07-14	4790-048-0910	ND
2014-07-18	4790-027-0930	ND
2014-07-18	4790-042-0900	ND
2014-07-24	4790-029-0830	ND
2014-07-24	4790-031-0915	ND
2014-07-28	4790-026-0900	ND
2014-07-29	4790-022-1020	ND
2014-07-29	4790-025-0950	ND
2014-07-29	4790-034-0945	ND
2014-07-29	4790-040-1040	ND
2014-08-12	4790-040-0845	ND
2014-08-12	4790-049-0800	ND
2014-08-19	4790-032-0815	ND
2014-08-19	4790-034-0900	ND
2014-08-21	4790-601-0827	12.0 ppb
2014-08-21	4790-602-0758	9.00 ppb
2014-08-21	4790-603-0900	9.00 ppb
2014-08-21	4790-604-1051	13.0 ppb
2014-08-21	4790-605-1116	12.0 ppb
2014-08-21	4790-606-0813	13.0 ppb
2014-08-21	4790-607-1103	12.0 ppb
2014-08-21	4790-608-0845	12.0 ppb
2014-10-15	4790-017-1000	ND
2014-10-15	4790-025-1100	ND
2014-10-16	4790-045-0815	ND
2014-10-16	4790-046-0910	ND
2014-10-16	4790-048-1000	ND
2014-10-28	4790-041-0850	ND
2014-10-28	4790-043-0820	ND
2014-10-28	4790-044-0800	ND
2014-11-06	4790-022-1010	ND
2014-11-06	4790-026-0915	ND
2014-11-07	4790-030-0930	ND
2014-11-20	4790-601-0820	9.70 ppb
2014-11-20	4790-602-0730	9.20 ppb
2014-11-20	4790-603-0910	10.00 ppb
2014-11-20	4790-604-1145	8.40 ppb
2014-11-20	4790-605-1125	8.70 ppb
2014-11-20	4790-606-0800	9.60 ppb
2014-11-20	4790-607-1135	8.50 ppb
2014-11-20	4790-608-0840	9.00 ppb
2014-12-04	4790-027-1020	ND
2014-12-04	4790-042-0945	ND
2015-02-19	4790-601-0755	8.60 ppb
2015-02-19	4790-602-0730	3.00 ppb
2015-02-19	4790-603-0825	8.80 ppb
2015-02-19	4790-604-1105	4.30 ppb
2015-02-19	4790-605-1045	4.40 ppb
2015-02-19	4790-606-1125	8.50 ppb
2015-02-19	4790-607-1055	4.50 ppb
2015-02-19	4790-608-0815	5.20 ppb
2015-05-07	4790-050-1042	ND
2015-05-21	4790-601-0817	11.0 ppb
2015-05-21	4790-602-0744	ND
2015-05-21	4790-603-0852	2.20 ppb
2015-05-21	4790-604-1140	2.50 ppb
2015-05-21	4790-605-1108	ND
2015-05-21	4790-606-0800	11.0 ppb
2015-05-21	4790-607-1125	12.0 ppb
2015-05-21	4790-608-0838	13.0 ppb
2015-08-13	4790-601-0930	13.0 ppb
2015-08-13	4790-602-0753	0.590 ppb
2015-08-13	4790-603-0905	12.0 ppb
2015-08-13	4790-604-1225	1.20 ppb
2015-08-13	4790-605-1207	ND
2015-08-13	4790-606-0830	11.0 ppb
2015-08-13	4790-607-1215	18.0 ppb
2015-08-13	4790-608-0915	4.70 ppb
2015-11-19	4790-601-0835	1.40 ppb
2015-11-19	4790-602-0750	ND
2015-11-19	4790-603-0910	ND
2015-11-19	4790-604-1210	9.30 ppb
2015-11-19	4790-605-1140	9.30 ppb
2015-11-19	4790-606-0810	2.40 ppb
2015-11-19	4790-607-1155	9.10 ppb
2015-11-19	4790-608-0850	9.50 ppb
2016-02-18	4790-601-0815	1.40 ppb
2016-05-26	4790-601-0750	3.10 ppb
2016-05-26	4790-602-0716	ND
2016-05-26	4790-603-0823	ND
2016-05-26	4790-604-1055	20.0 ppb
2016-05-26	4790-605-1034	20.0 ppb
2016-05-26	4790-606-0734	2.80 ppb
2016-05-26	4790-607-1044	20.0 ppb
2016-05-26	4790-608-0806	20.0 ppb
2016-08-25	4790-601-0811	0.710 ppb
2016-08-25	4790-602-0730	ND
2016-08-25	4790-603-0841	ND
2016-08-25	4790-604-1115	ND
2016-08-25	4790-605-1134	ND
2016-08-25	4790-606-0749	1.10 ppb
2016-08-25	4790-607-1124	ND
2016-08-25	4790-608-0824	0.500 ppb
2016-11-17	4790-601-0802	2.60 ppb
2016-11-17	4790-602-0715	ND
2016-11-17	4790-603-0847	1.90 ppb
2016-11-17	4790-604-1136	0.500 ppb
2016-11-17	4790-605-1113	ND
2016-11-17	4790-606-0736	1.000 ppb
2016-11-17	4790-607-1123	ND
2016-11-17	4790-608-0820	ND
2017-02-01	4790-050-0831	ND
2017-02-23	4790-601-1000	1.30 ppb
2017-02-23	4790-602-0920	0.790 ppb
2017-02-23	4790-603-1040	ND
2017-02-23	4790-604-1105	ND
2017-02-23	4790-605-1135	ND
2017-02-23	4790-606-0945	1.40 ppb
2017-02-23	4790-607-1115	ND
2017-02-23	4790-608-1020	ND
2017-04-20	4790-030-0910	ND
2017-05-11	4790-601-0835	6.40 ppb
2017-05-11	4790-602-0745	ND
2017-05-11	4790-603-0925	6.80 ppb
2017-05-11	4790-604-1210	14.0 ppb
2017-05-11	4790-605-1150	14.0 ppb
2017-05-11	4790-606-0810	4.60 ppb
2017-05-11	4790-608-0850	6.60 ppb
2017-05-30	4790-607-1452	11.0 ppb
2017-07-03	4790-042-0910	ND
2017-07-03	4790-043-1110	ND
2017-07-03	4790-044-1015	ND
2017-07-06	4790-025-0955	ND
2017-07-12	4790-031-1130	ND
2017-07-12	4790-034-0910	ND
2017-07-12	4790-041-0815	ND
2017-07-12	4790-049-1055	ND
2017-07-19	4790-020-0730	ND
2017-07-19	4790-026-0930	ND
2017-07-19	4790-032-0835	ND
2017-07-19	4790-045-1050	ND
2017-08-03	4790-048-0815	ND
2017-08-10	4790-601-0830	2.40 ppb
2017-08-10	4790-602-0740	ND
2017-08-10	4790-603-0905	1.10 ppb
2017-08-10	4790-604-1200	11.0 ppb
2017-08-10	4790-605-1125	13.0 ppb
2017-08-10	4790-606-0805	3.90 ppb
2017-08-10	4790-607-1140	13.0 ppb
2017-08-10	4790-608-0855	15.0 ppb
2017-11-16	4790-601-0835	6.80 ppb
2017-11-16	4790-602-0740	ND
2017-11-16	4790-603-0920	4.30 ppb
2017-11-16	4790-604-1210	11.0 ppb
2017-11-16	4790-605-1142	12.0 ppb
2017-11-16	4790-606-0805	2.40 ppb
2017-11-16	4790-607-1155	12.0 ppb
2017-11-16	4790-608-0900	13.0 ppb
2018-02-08	4790-601-0820	2.10 ppb
2018-02-08	4790-602-0740	ND
2018-02-08	4790-603-0905	1.000 ppb
2018-02-08	4790-604-1145	ND
2018-02-08	4790-605-1120	ND
2018-02-08	4790-606-0800	1.20 ppb
2018-02-08	4790-607-1135	6.00 ppb
2018-02-08	4790-608-0850	15.0 ppb
2018-05-10	4790-601-0825	2.70 ppb
2018-05-10	4790-602-0740	ND
2018-05-10	4790-603-0905	ND
2018-05-10	4790-604-1205	16.0 ppb
2018-05-10	4790-605-1135	ND
2018-05-10	4790-606-0805	1.90 ppb
2018-05-10	4790-607-1150	17.0 ppb
2018-05-10	4790-608-0845	17.0 ppb
2018-08-09	4790-601-0850	5.20 ppb
2018-08-09	4790-602-0800	3.40 ppb
2018-08-09	4790-603-0930	2.60 ppb
2018-08-09	4790-604-1235	16.0 ppb
2018-08-09	4790-605-1205	17.0 ppb
2018-08-09	4790-606-0825	6.80 ppb
2018-08-09	4790-607-1220	16.0 ppb
2018-08-09	4790-608-0910	16.0 ppb
2018-11-15	4790-601-0830	14.0 ppb
2018-11-15	4790-602-0740	ND
2018-11-15	4790-603-0910	15.0 ppb
2018-11-15	4790-604-1210	13.0 ppb
2018-11-15	4790-605-1140	13.0 ppb
2018-11-15	4790-606-0800	14.0 ppb
2018-11-15	4790-607-1155	13.0 ppb
2018-11-15	4790-608-0855	14.0 ppb
2019-02-13	4790-601-1130	5.00 ppb
2019-02-13	4790-602-1210	ND
2019-02-13	4790-603-1055	5.90 ppb
2019-02-13	4790-604-1035	20.0 ppb
2019-02-13	4790-605-1010	20.0 ppb
2019-02-13	4790-606-1150	8.70 ppb
2019-02-13	4790-607-1020	20.0 ppb
2019-02-13	4790-608-1110	22.0 ppb
2019-05-09	4790-601-0900	2.50 ppb
2019-05-09	4790-602-0815	ND
2019-05-09	4790-603-0955	ND
2019-05-09	4790-604-1015	18.0 ppb
2019-05-09	4790-605-1045	17.0 ppb
2019-05-09	4790-606-0835	1.60 ppb
2019-05-09	4790-607-1030	17.0 ppb
2019-05-09	4790-608-0935	18.0 ppb
2019-08-15	4790-601-0805	11.0 ppb
2019-08-15	4790-602-0725	6.60 ppb
2019-08-15	4790-603-0850	12.0 ppb
2019-08-15	4790-604-1200	ND
2019-08-15	4790-605-1125	ND
2019-08-15	4790-606-0745	11.0 ppb
2019-08-15	4790-607-1140	ND
2019-08-15	4790-608-0830	ND
2019-10-30	4790-040-0826	ND
2019-11-14	4790-601-0810	12.0 ppb
2019-11-14	4790-602-0735	4.50 ppb
2019-11-14	4790-603-0850	13.0 ppb
2019-11-14	4790-604-1135	ND
2019-11-14	4790-605-1110	ND
2019-11-14	4790-606-0750	12.0 ppb
2019-11-14	4790-607-1125	ND
2019-11-14	4790-608-0825	2.60 ppb