Dibromochloromethane

Paramount Water Department

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

230

Samples

Samples exceeding legal limit (MCL)

194

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	1.64 ppb	43	30	ND - 7.29 ppb
2015	2.64 ppb	37	33	ND - 5.97 ppb
2016	4.42 ppb	37	33	ND - 11.5 ppb
2017	1.59 ppb	45	42	ND - 4.77 ppb
2018	2.28 ppb	37	34	ND - 4.71 ppb
2019	1.61 ppb	31	22	ND - 4.67 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	9469-800-0756	1.17 ppb
2014-01-07	9469-801-0810	ND
2014-01-07	9469-802-1025	1.14 ppb
2014-01-07	9469-803-0822	2.34 ppb
2014-01-07	9469-804-0840	4.49 ppb
2014-01-07	9469-805-0855	7.29 ppb
2014-01-07	9469-806-1008	6.82 ppb
2014-01-07	9469-807-1034	ND
2014-02-27	9588-025-0954	ND
2014-02-27	9588-027-1001	1.60 ppb
2014-04-01	9469-800-0814	1.74 ppb
2014-04-01	9469-801-0821	0.608 ppb
2014-04-01	9469-802-1045	0.564 ppb
2014-04-01	9469-803-0832	2.00 ppb
2014-04-01	9469-804-0850	2.98 ppb
2014-04-01	9469-805-1005	2.59 ppb
2014-04-01	9469-806-1015	2.35 ppb
2014-04-01	9469-807-1035	1.38 ppb
2014-04-28	9588-015-1100	ND
2014-04-28	9588-016-1127	ND
2014-04-28	9588-024-1106	ND
2014-04-28	9588-025-1032	ND
2014-04-28	9588-027-1034	1.20 ppb
2014-07-01	9469-800-0746	0.887 ppb
2014-07-01	9469-801-0757	ND
2014-07-01	9469-802-0813	ND
2014-07-01	9469-803-0824	2.33 ppb
2014-07-01	9469-804-0851	3.61 ppb
2014-07-01	9469-805-0834	3.44 ppb
2014-07-01	9469-806-0841	3.61 ppb
2014-07-01	9469-807-0805	1.43 ppb
2014-07-29	9588-025-1020	ND
2014-07-29	9588-027-1035	ND
2014-10-07	9469-800-1000	1.41 ppb
2014-10-07	9469-801-1032	1.26 ppb
2014-10-07	9469-802-1040	1.43 ppb
2014-10-07	9469-803-1051	2.96 ppb
2014-10-07	9469-804-1235	1.43 ppb
2014-10-07	9469-805-1245	3.28 ppb
2014-10-07	9469-806-1010	2.45 ppb
2014-10-07	9469-807-1045	0.708 ppb
2014-10-29	9588-025-1027	ND
2014-10-29	9588-027-1020	ND
2015-01-06	9469-800-0952	2.19 ppb
2015-01-06	9469-801-1008	1.52 ppb
2015-01-06	9469-802-1020	1.91 ppb
2015-01-06	9469-803-1043	3.20 ppb
2015-01-06	9469-804-1116	3.12 ppb
2015-01-06	9469-805-1101	3.46 ppb
2015-01-06	9469-806-1050	4.12 ppb
2015-01-06	9469-807-1031	1.24 ppb
2015-01-29	9588-025-1527	ND
2015-01-29	9588-027-1531	1.30 ppb
2015-04-21	9469-800-0740	2.73 ppb
2015-04-21	9469-801-0750	1.20 ppb
2015-04-21	9469-802-0758	1.52 ppb
2015-04-21	9469-803-0809	2.87 ppb
2015-04-21	9469-804-0858	3.60 ppb
2015-04-21	9469-805-0844	3.32 ppb
2015-04-21	9469-806-0835	3.30 ppb
2015-04-21	9469-807-0822	1.72 ppb
2015-04-27	9588-015-1003	ND
2015-04-27	9588-016-0945	ND
2015-04-27	9588-024-1006	ND
2015-07-28	9469-800-0750	4.11 ppb
2015-07-28	9469-801-0756	3.31 ppb
2015-07-28	9469-802-0815	3.35 ppb
2015-07-28	9469-803-0828	5.19 ppb
2015-07-28	9469-804-0856	5.33 ppb
2015-07-28	9469-805-1020	5.53 ppb
2015-07-28	9469-806-1032	5.97 ppb
2015-07-28	9469-807-0841	3.41 ppb
2015-10-20	9469-800-1033	2.61 ppb
2015-10-20	9469-801-1041	1.84 ppb
2015-10-20	9469-802-1015	2.72 ppb
2015-10-20	9469-803-1006	2.47 ppb
2015-10-20	9469-804-0936	2.78 ppb
2015-10-20	9469-805-0948	2.68 ppb
2015-10-20	9469-806-0954	2.48 ppb
2015-10-20	9469-807-1022	1.56 ppb
2016-01-11	9469-800-1005	11.5 ppb
2016-01-11	9469-801-1054	11.2 ppb
2016-01-11	9469-802-1101	10.9 ppb
2016-01-11	9469-803-1121	11.1 ppb
2016-01-11	9469-804-1150	11.4 ppb
2016-01-11	9469-805-1134	11.1 ppb
2016-01-11	9469-806-1141	11.0 ppb
2016-01-11	9469-807-1110	10.9 ppb
2016-01-29	9588-025-0948	ND
2016-01-29	9588-027-0954	1.20 ppb
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	3.05 ppb
2016-05-18	9469-801-1126	1.84 ppb
2016-05-18	9469-802-0900	2.28 ppb
2016-05-18	9469-803-1135	3.80 ppb
2016-05-18	9469-804-1049	4.83 ppb
2016-05-18	9469-805-1100	4.09 ppb
2016-05-18	9469-806-1109	4.71 ppb
2016-05-18	9469-807-0850	1.98 ppb
2016-07-18	9469-800-1324	2.16 ppb
2016-07-18	9469-801-1318	1.42 ppb
2016-07-18	9469-802-1303	1.81 ppb
2016-07-18	9469-803-1255	3.06 ppb
2016-07-18	9469-804-1246	4.21 ppb
2016-07-18	9469-805-1230	4.36 ppb
2016-07-18	9469-806-1236	3.47 ppb
2016-07-18	9469-807-1310	1.20 ppb
2016-10-11	9469-800-0918	2.60 ppb
2016-10-11	9469-801-0722	1.87 ppb
2016-10-11	9469-802-0739	2.37 ppb
2016-10-11	9469-803-1028	3.94 ppb
2016-10-11	9469-804-0907	4.48 ppb
2016-10-11	9469-805-0857	4.11 ppb
2016-10-11	9469-806-0847	3.75 ppb
2016-10-11	9469-807-0818	1.72 ppb
2017-01-23	9588-025-1045	ND
2017-01-23	9588-027-1047	1.20 ppb
2017-03-20	9469-800-1110	1.31 ppb
2017-03-20	9469-801-1118	1.15 ppb
2017-03-20	9469-802-1133	1.23 ppb
2017-03-20	9469-803-1253	1.49 ppb
2017-03-20	9469-804-1329	1.65 ppb
2017-03-20	9469-805-1306	1.47 ppb
2017-03-20	9469-806-1318	1.04 ppb
2017-03-20	9469-807-1127	1.46 ppb
2017-04-03	9588-015-1124	ND
2017-04-03	9588-016-1020	ND
2017-04-03	9588-024-1112	1.000 ppb
2017-04-17	9469-800-1020	2.34 ppb
2017-04-17	9469-801-1026	1.50 ppb
2017-04-17	9469-802-1034	2.08 ppb
2017-04-17	9469-803-0847	3.22 ppb
2017-04-17	9469-804-1055	4.77 ppb
2017-04-17	9469-805-0900	3.63 ppb
2017-04-17	9469-806-1046	3.38 ppb
2017-04-17	9469-807-0746	1.33 ppb
2017-07-11	9469-800-1020	1.30 ppb
2017-07-11	9469-801-1027	1.04 ppb
2017-07-11	9469-802-1036	1.14 ppb
2017-07-11	9469-803-1058	1.39 ppb
2017-07-11	9469-804-1136	1.68 ppb
2017-07-11	9469-805-1125	1.58 ppb
2017-07-11	9469-806-1114	1.45 ppb
2017-07-11	9469-807-1046	1.11 ppb
2017-10-03	9469-800-0920	2.10 ppb
2017-10-03	9469-801-0727	1.22 ppb
2017-10-03	9469-802-0929	1.29 ppb
2017-10-03	9469-803-0938	1.27 ppb
2017-10-03	9469-804-1015	2.20 ppb
2017-10-03	9469-805-1000	1.34 ppb
2017-10-03	9469-806-0950	1.38 ppb
2017-10-03	9469-807-0810	1.16 ppb
2017-10-17	9469-800-1017	1.94 ppb
2017-10-17	9469-801-1029	1.45 ppb
2017-10-17	9469-802-1035	2.02 ppb
2017-10-17	9469-803-1106	1.76 ppb
2017-10-17	9469-804-1123	1.25 ppb
2017-10-17	9469-805-1130	2.06 ppb
2017-10-17	9469-806-1114	1.75 ppb
2017-10-17	9469-807-1054	1.40 ppb
2018-01-08	9588-025-1130	ND
2018-01-08	9588-027-1136	1.40 ppb
2018-01-16	9469-800-0650	1.42 ppb
2018-01-16	9469-801-0655	1.39 ppb
2018-01-16	9469-802-0707	1.45 ppb
2018-01-16	9469-803-0735	1.92 ppb
2018-01-16	9469-804-0914	2.35 ppb
2018-01-16	9469-805-1044	2.14 ppb
2018-01-16	9469-806-1031	2.06 ppb
2018-01-16	9469-807-1019	1.94 ppb
2018-04-09	9588-015-1041	ND
2018-04-09	9588-024-1046	1.000 ppb
2018-04-16	9588-016-0940	ND
2018-04-23	9469-800-1150	2.54 ppb
2018-04-23	9469-801-1205	2.53 ppb
2018-04-23	9469-802-1211	2.45 ppb
2018-04-23	9469-803-1229	2.60 ppb
2018-04-23	9469-804-1300	2.60 ppb
2018-04-23	9469-805-1249	2.69 ppb
2018-04-23	9469-806-1240	2.72 ppb
2018-04-23	9469-807-1218	2.42 ppb
2018-07-17	9469-800-0720	2.66 ppb
2018-07-17	9469-801-1208	1.60 ppb
2018-07-17	9469-802-0836	2.20 ppb
2018-07-17	9469-803-0742	3.32 ppb
2018-07-17	9469-804-0913	4.71 ppb
2018-07-17	9469-805-0902	3.95 ppb
2018-07-17	9469-806-0853	1.86 ppb
2018-07-17	9469-807-0822	1.78 ppb
2018-10-16	9469-800-0732	2.50 ppb
2018-10-16	9469-801-1145	2.45 ppb
2018-10-16	9469-802-0804	2.12 ppb
2018-10-16	9469-803-0749	2.75 ppb
2018-10-16	9469-804-0935	4.54 ppb
2018-10-16	9469-805-0924	3.64 ppb
2018-10-16	9469-806-0912	4.01 ppb
2018-10-16	9469-807-0852	2.68 ppb
2019-01-07	9588-025-1028	ND
2019-01-15	9469-800-0705	2.03 ppb
2019-01-15	9469-801-0714	1.36 ppb
2019-01-15	9469-802-0721	1.04 ppb
2019-01-15	9469-803-0734	2.28 ppb
2019-01-15	9469-804-1010	2.80 ppb
2019-01-15	9469-805-0955	3.76 ppb
2019-01-15	9469-806-0948	2.57 ppb
2019-01-15	9469-807-0935	1.84 ppb
2019-03-20	9588-025-1025	ND
2019-03-20	9588-027-1030	1.000 ppb
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	2.13 ppb
2019-04-23	9469-801-1027	1.40 ppb
2019-04-23	9469-802-1016	1.18 ppb
2019-04-23	9469-803-0836	3.24 ppb
2019-04-23	9469-804-0900	4.67 ppb
2019-04-23	9469-805-0851	4.46 ppb
2019-04-23	9469-806-0844	4.19 ppb
2019-04-23	9469-807-0817	3.23 ppb
2019-10-15	2706-800-0744	1.10 ppb
2019-10-15	2706-801-0751	ND
2019-10-15	2706-802-0802	ND
2019-10-15	2706-803-0817	1.30 ppb
2019-10-15	2706-804-0850	1.30 ppb
2019-10-15	2706-805-0841	1.50 ppb
2019-10-15	2706-806-0831	1.40 ppb
2019-10-15	2706-807-0001	ND
2019-10-15	2706-807-0807	ND