Bromodichloromethane

Paramount Water Department

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

230

Samples

Samples exceeding legal limit (MCL)

169

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	0.871 ppb	43	21	ND - 7.61 ppb
2015	1.63 ppb	37	30	ND - 3.48 ppb
2016	3.43 ppb	37	32	ND - 10.1 ppb
2017	1.15 ppb	45	38	ND - 3.06 ppb
2018	1.62 ppb	37	34	ND - 3.20 ppb
2019	0.849 ppb	31	14	ND - 3.11 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
2014-01-07	9469-800-0756	ND
2014-01-07	9469-801-0810	ND
2014-01-07	9469-802-1025	ND
2014-01-07	9469-803-0822	1.14 ppb
2014-01-07	9469-804-0840	4.00 ppb
2014-01-07	9469-805-0855	7.61 ppb
2014-01-07	9469-806-1008	6.99 ppb
2014-01-07	9469-807-1034	ND
2014-02-27	9588-025-0954	ND
2014-02-27	9588-027-1001	1.70 ppb
2014-04-01	9469-800-0814	1.04 ppb
2014-04-01	9469-801-0821	ND
2014-04-01	9469-802-1045	ND
2014-04-01	9469-803-0832	0.753 ppb
2014-04-01	9469-804-0850	1.38 ppb
2014-04-01	9469-805-1005	1.03 ppb
2014-04-01	9469-806-1015	0.887 ppb
2014-04-01	9469-807-1035	ND
2014-04-28	9588-015-1100	ND
2014-04-28	9588-016-1127	ND
2014-04-28	9588-024-1106	1.20 ppb
2014-04-28	9588-025-1032	ND
2014-04-28	9588-027-1034	ND
2014-07-01	9469-800-0746	ND
2014-07-01	9469-801-0757	ND
2014-07-01	9469-802-0813	ND
2014-07-01	9469-803-0824	0.680 ppb
2014-07-01	9469-804-0851	1.51 ppb
2014-07-01	9469-805-0834	1.06 ppb
2014-07-01	9469-806-0841	1.02 ppb
2014-07-01	9469-807-0805	ND
2014-07-29	9588-025-1020	ND
2014-07-29	9588-027-1035	ND
2014-10-07	9469-800-1000	0.563 ppb
2014-10-07	9469-801-1032	0.515 ppb
2014-10-07	9469-802-1040	ND
2014-10-07	9469-803-1051	1.27 ppb
2014-10-07	9469-804-1235	0.693 ppb
2014-10-07	9469-805-1245	1.40 ppb
2014-10-07	9469-806-1010	1.02 ppb
2014-10-07	9469-807-1045	ND
2014-10-29	9588-025-1027	ND
2014-10-29	9588-027-1020	ND
2015-01-06	9469-800-0952	1.38 ppb
2015-01-06	9469-801-1008	ND
2015-01-06	9469-802-1020	1.19 ppb
2015-01-06	9469-803-1043	2.02 ppb
2015-01-06	9469-804-1116	1.93 ppb
2015-01-06	9469-805-1101	2.12 ppb
2015-01-06	9469-806-1050	2.45 ppb
2015-01-06	9469-807-1031	ND
2015-01-29	9588-025-1527	ND
2015-01-29	9588-027-1531	ND
2015-04-21	9469-800-0740	1.56 ppb
2015-04-21	9469-801-0750	ND
2015-04-21	9469-802-0758	1.13 ppb
2015-04-21	9469-803-0809	1.72 ppb
2015-04-21	9469-804-0858	2.16 ppb
2015-04-21	9469-805-0844	1.81 ppb
2015-04-21	9469-806-0835	1.85 ppb
2015-04-21	9469-807-0822	1.22 ppb
2015-04-27	9588-015-1003	ND
2015-04-27	9588-016-0945	ND
2015-04-27	9588-024-1006	1.30 ppb
2015-07-28	9469-800-0750	2.52 ppb
2015-07-28	9469-801-0756	2.46 ppb
2015-07-28	9469-802-0815	2.30 ppb
2015-07-28	9469-803-0828	3.04 ppb
2015-07-28	9469-804-0856	3.24 ppb
2015-07-28	9469-805-1020	3.46 ppb
2015-07-28	9469-806-1032	3.48 ppb
2015-07-28	9469-807-0841	2.07 ppb
2015-10-20	9469-800-1033	1.80 ppb
2015-10-20	9469-801-1041	1.33 ppb
2015-10-20	9469-802-1015	1.89 ppb
2015-10-20	9469-803-1006	1.83 ppb
2015-10-20	9469-804-0936	1.99 ppb
2015-10-20	9469-805-0948	1.99 ppb
2015-10-20	9469-806-0954	1.82 ppb
2015-10-20	9469-807-1022	1.12 ppb
2016-01-11	9469-800-1005	9.89 ppb
2016-01-11	9469-801-1054	10.1 ppb
2016-01-11	9469-802-1101	9.75 ppb
2016-01-11	9469-803-1121	9.90 ppb
2016-01-11	9469-804-1150	10.00 ppb
2016-01-11	9469-805-1134	9.83 ppb
2016-01-11	9469-806-1141	9.89 ppb
2016-01-11	9469-807-1110	9.98 ppb
2016-01-29	9588-025-0948	ND
2016-01-29	9588-027-0954	ND
2016-04-29	9588-015-0956	ND
2016-04-29	9588-016-0923	ND
2016-04-29	9588-024-0959	ND
2016-05-18	9469-800-1119	1.90 ppb
2016-05-18	9469-801-1126	1.27 ppb
2016-05-18	9469-802-0900	1.40 ppb
2016-05-18	9469-803-1135	2.47 ppb
2016-05-18	9469-804-1049	2.73 ppb
2016-05-18	9469-805-1100	2.46 ppb
2016-05-18	9469-806-1109	2.84 ppb
2016-05-18	9469-807-0850	1.34 ppb
2016-07-18	9469-800-1324	1.46 ppb
2016-07-18	9469-801-1318	1.06 ppb
2016-07-18	9469-802-1303	1.30 ppb
2016-07-18	9469-803-1255	2.13 ppb
2016-07-18	9469-804-1246	2.64 ppb
2016-07-18	9469-805-1230	2.86 ppb
2016-07-18	9469-806-1236	2.53 ppb
2016-07-18	9469-807-1310	0.983 ppb
2016-10-11	9469-800-0918	1.72 ppb
2016-10-11	9469-801-0722	1.39 ppb
2016-10-11	9469-802-0739	1.64 ppb
2016-10-11	9469-803-1028	2.35 ppb
2016-10-11	9469-804-0907	2.81 ppb
2016-10-11	9469-805-0857	2.63 ppb
2016-10-11	9469-806-0847	2.40 ppb
2016-10-11	9469-807-0818	1.28 ppb
2017-01-23	9588-025-1045	ND
2017-01-23	9588-027-1047	ND
2017-03-20	9469-800-1110	1.08 ppb
2017-03-20	9469-801-1118	0.949 ppb
2017-03-20	9469-802-1133	1.02 ppb
2017-03-20	9469-803-1253	1.19 ppb
2017-03-20	9469-804-1329	1.45 ppb
2017-03-20	9469-805-1306	1.28 ppb
2017-03-20	9469-806-1318	0.819 ppb
2017-03-20	9469-807-1127	1.19 ppb
2017-04-03	9588-015-1124	ND
2017-04-03	9588-016-1020	ND
2017-04-03	9588-024-1112	ND
2017-04-17	9469-800-1020	1.50 ppb
2017-04-17	9469-801-1026	1.05 ppb
2017-04-17	9469-802-1034	1.36 ppb
2017-04-17	9469-803-0847	1.92 ppb
2017-04-17	9469-804-1055	3.06 ppb
2017-04-17	9469-805-0900	2.07 ppb
2017-04-17	9469-806-1046	1.94 ppb
2017-04-17	9469-807-0746	0.939 ppb
2017-07-11	9469-800-1020	1.10 ppb
2017-07-11	9469-801-1027	0.834 ppb
2017-07-11	9469-802-1036	0.971 ppb
2017-07-11	9469-803-1058	1.19 ppb
2017-07-11	9469-804-1136	1.39 ppb
2017-07-11	9469-805-1125	1.26 ppb
2017-07-11	9469-806-1114	1.17 ppb
2017-07-11	9469-807-1046	0.916 ppb
2017-10-03	9469-800-0920	2.09 ppb
2017-10-03	9469-801-0727	ND
2017-10-03	9469-802-0929	1.06 ppb
2017-10-03	9469-803-0938	1.09 ppb
2017-10-03	9469-804-1015	2.43 ppb
2017-10-03	9469-805-1000	1.22 ppb
2017-10-03	9469-806-0950	1.15 ppb
2017-10-03	9469-807-0810	ND
2017-10-17	9469-800-1017	1.78 ppb
2017-10-17	9469-801-1029	1.14 ppb
2017-10-17	9469-802-1035	1.51 ppb
2017-10-17	9469-803-1106	1.40 ppb
2017-10-17	9469-804-1123	1.16 ppb
2017-10-17	9469-805-1130	1.58 ppb
2017-10-17	9469-806-1114	1.47 ppb
2017-10-17	9469-807-1054	1.13 ppb
2018-01-08	9588-025-1130	ND
2018-01-08	9588-027-1136	1.10 ppb
2018-01-16	9469-800-0650	1.05 ppb
2018-01-16	9469-801-0655	1.06 ppb
2018-01-16	9469-802-0707	1.14 ppb
2018-01-16	9469-803-0735	1.49 ppb
2018-01-16	9469-804-0914	1.66 ppb
2018-01-16	9469-805-1044	1.63 ppb
2018-01-16	9469-806-1031	1.58 ppb
2018-01-16	9469-807-1019	1.41 ppb
2018-04-09	9588-015-1041	ND
2018-04-09	9588-024-1046	1.30 ppb
2018-04-16	9588-016-0940	ND
2018-04-23	9469-800-1150	2.01 ppb
2018-04-23	9469-801-1205	2.00 ppb
2018-04-23	9469-802-1211	1.92 ppb
2018-04-23	9469-803-1229	2.06 ppb
2018-04-23	9469-804-1300	2.06 ppb
2018-04-23	9469-805-1249	2.13 ppb
2018-04-23	9469-806-1240	2.14 ppb
2018-04-23	9469-807-1218	1.82 ppb
2018-07-17	9469-800-0720	1.77 ppb
2018-07-17	9469-801-1208	1.000 ppb
2018-07-17	9469-802-0836	1.48 ppb
2018-07-17	9469-803-0742	2.26 ppb
2018-07-17	9469-804-0913	2.88 ppb
2018-07-17	9469-805-0902	2.58 ppb
2018-07-17	9469-806-0853	1.24 ppb
2018-07-17	9469-807-0822	1.34 ppb
2018-10-16	9469-800-0732	1.47 ppb
2018-10-16	9469-801-1145	1.47 ppb
2018-10-16	9469-802-0804	1.25 ppb
2018-10-16	9469-803-0749	1.69 ppb
2018-10-16	9469-804-0935	3.20 ppb
2018-10-16	9469-805-0924	2.51 ppb
2018-10-16	9469-806-0912	2.70 ppb
2018-10-16	9469-807-0852	1.60 ppb
2019-01-07	9588-025-1028	ND
2019-01-15	9469-800-0705	1.36 ppb
2019-01-15	9469-801-0714	ND
2019-01-15	9469-802-0721	ND
2019-01-15	9469-803-0734	1.60 ppb
2019-01-15	9469-804-1010	2.17 ppb
2019-01-15	9469-805-0955	2.94 ppb
2019-01-15	9469-806-0948	1.94 ppb
2019-01-15	9469-807-0935	1.10 ppb
2019-03-20	9588-025-1025	ND
2019-03-20	9588-027-1030	ND
2019-04-03	9588-015-1035	ND
2019-04-03	9588-016-1010	ND
2019-04-03	9588-024-1040	ND
2019-04-23	9469-800-0723	1.03 ppb
2019-04-23	9469-801-1027	ND
2019-04-23	9469-802-1016	ND
2019-04-23	9469-803-0836	1.62 ppb
2019-04-23	9469-804-0900	3.11 ppb
2019-04-23	9469-805-0851	2.78 ppb
2019-04-23	9469-806-0844	2.88 ppb
2019-04-23	9469-807-0817	1.50 ppb
2019-10-15	2706-800-0744	ND
2019-10-15	2706-801-0751	ND
2019-10-15	2706-802-0802	ND
2019-10-15	2706-803-0817	ND
2019-10-15	2706-804-0850	ND
2019-10-15	2706-805-0841	1.20 ppb
2019-10-15	2706-806-0831	1.10 ppb
2019-10-15	2706-807-0001	ND
2019-10-15	2706-807-0807	ND