Bromodichloromethane

City of Milpitas

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

169

Samples

Samples exceeding legal limit (MCL)

137

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	3.68 ppb	32	25	ND - 16.0 ppb
2015	3.73 ppb	32	31	ND - 14.0 ppb
2016	3.90 ppb	16	16	1.20 ppb - 13.0 ppb
2017	3.68 ppb	25	25	1.000 ppb - 10.00 ppb
2018	2.20 ppb	32	16	ND - 12.0 ppb
2019	3.41 ppb	32	24	ND - 19.0 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
2014-03-19	9590-900-1322	15.0 ppb
2014-03-19	9590-901-1410	ND
2014-03-19	9590-902-1344	ND
2014-03-19	9590-903-1426	16.0 ppb
2014-03-19	9590-904-1500	2.00 ppb
2014-03-19	9590-905-1434	ND
2014-03-19	9590-906-1320	ND
2014-03-19	9590-907-1353	2.10 ppb
2014-06-26	9590-900-1415	10.00 ppb
2014-06-26	9590-901-1450	ND
2014-06-26	9590-902-1403	1.10 ppb
2014-06-26	9590-903-1325	7.70 ppb
2014-06-26	9590-904-1451	ND
2014-06-26	9590-905-1432	1.30 ppb
2014-06-26	9590-906-1346	1.30 ppb
2014-06-26	9590-907-1350	ND
2014-09-17	9590-900-1054	8.10 ppb
2014-09-17	9590-901-0910	1.40 ppb
2014-09-17	9590-902-1024	1.80 ppb
2014-09-17	9590-903-1005	8.20 ppb
2014-09-17	9590-904-1128	2.00 ppb
2014-09-17	9590-905-0838	2.10 ppb
2014-09-17	9590-906-0939	2.10 ppb
2014-09-17	9590-907-1151	2.10 ppb
2014-12-31	9590-900-0818	13.0 ppb
2014-12-31	9590-901-0835	2.40 ppb
2014-12-31	9590-902-0935	2.70 ppb
2014-12-31	9590-903-0910	3.20 ppb
2014-12-31	9590-904-1034	3.20 ppb
2014-12-31	9590-905-0810	2.90 ppb
2014-12-31	9590-906-0905	2.90 ppb
2014-12-31	9590-907-0954	3.10 ppb
2015-03-10	9590-900-1200	13.0 ppb
2015-03-10	9590-901-0915	1.60 ppb
2015-03-10	9590-902-1005	2.20 ppb
2015-03-10	9590-903-1041	14.0 ppb
2015-03-10	9590-904-1110	1.50 ppb
2015-03-10	9590-905-0849	1.40 ppb
2015-03-10	9590-906-0940	1.50 ppb
2015-03-10	9590-907-1136	1.60 ppb
2015-06-09	9590-900-1050	9.50 ppb
2015-06-09	9590-901-0850	1.20 ppb
2015-06-09	9590-902-1008	1.20 ppb
2015-06-09	9590-903-0938	9.70 ppb
2015-06-09	9590-904-1150	1.60 ppb
2015-06-09	9590-905-0825	1.30 ppb
2015-06-09	9590-906-0915	1.20 ppb
2015-06-09	9590-907-1121	2.00 ppb
2015-09-09	9590-900-1202	8.10 ppb
2015-09-09	9590-901-0916	ND
2015-09-09	9590-902-1000	1.10 ppb
2015-09-09	9590-903-1026	10.00 ppb
2015-09-09	9590-904-1129	2.50 ppb
2015-09-09	9590-905-0850	1.20 ppb
2015-09-09	9590-906-0940	1.10 ppb
2015-09-09	9590-907-1109	2.50 ppb
2015-12-16	9590-900-1048	8.80 ppb
2015-12-16	9590-901-0805	1.50 ppb
2015-12-16	9590-902-0845	1.60 ppb
2015-12-16	9590-903-0912	7.20 ppb
2015-12-16	9590-904-1016	3.40 ppb
2015-12-16	9590-905-0743	1.30 ppb
2015-12-16	9590-906-0826	1.40 ppb
2015-12-16	9590-907-0943	3.10 ppb
2016-03-16	9590-900-1136	6.30 ppb
2016-03-16	9590-901-0930	2.90 ppb
2016-03-16	9590-902-1038	3.30 ppb
2016-03-16	9590-903-1114	6.80 ppb
2016-03-16	9590-904-1239	3.10 ppb
2016-03-16	9590-905-0900	3.10 ppb
2016-03-16	9590-906-1003	3.10 ppb
2016-03-16	9590-907-1210	2.50 ppb
2016-07-20	9590-900-0927	13.0 ppb
2016-07-20	9590-901-0930	1.30 ppb
2016-07-20	9590-902-1025	1.20 ppb
2016-07-20	9590-903-1029	11.0 ppb
2016-07-20	9590-904-1057	1.20 ppb
2016-07-20	9590-905-1123	1.20 ppb
2016-07-20	9590-906-1052	1.20 ppb
2016-07-20	9590-907-0958	1.20 ppb
2017-03-22	9590-900-1120	8.90 ppb
2017-03-22	9590-901-0903	3.40 ppb
2017-03-22	9590-902-0920	3.80 ppb
2017-03-22	9590-903-1015	8.30 ppb
2017-03-22	9590-904-1040	4.90 ppb
2017-03-22	9590-905-0848	3.50 ppb
2017-03-22	9590-906-1001	3.40 ppb
2017-03-22	9590-907-0811	4.70 ppb
2017-07-13	9590-900-0850	10.00 ppb
2017-09-20	9590-900-0930	6.80 ppb
2017-09-20	9590-901-1317	1.10 ppb
2017-09-20	9590-902-1250	1.20 ppb
2017-09-20	9590-903-1340	5.90 ppb
2017-09-20	9590-904-1021	3.60 ppb
2017-09-20	9590-905-1101	1.000 ppb
2017-09-20	9590-906-1423	1.10 ppb
2017-09-20	9590-907-1000	2.30 ppb
2017-12-20	9590-900-0922	2.70 ppb
2017-12-20	9590-901-1005	1.90 ppb
2017-12-20	9590-902-0803	2.20 ppb
2017-12-20	9590-903-1313	2.30 ppb
2017-12-20	9590-904-1246	2.00 ppb
2017-12-20	9590-905-1358	2.20 ppb
2017-12-20	9590-906-0847	2.50 ppb
2017-12-20	9590-907-1047	2.20 ppb
2018-03-14	9590-900-1022	ND
2018-03-14	9590-901-1425	ND
2018-03-14	9590-902-1115	ND
2018-03-14	9590-903-1140	ND
2018-03-14	9590-904-1050	ND
2018-03-14	9590-905-1220	ND
2018-03-14	9590-906-1625	ND
2018-03-14	9590-907-1115	ND
2018-06-21	9590-900-1036	9.80 ppb
2018-06-21	9590-901-1301	ND
2018-06-21	9590-902-1017	8.90 ppb
2018-06-21	9590-903-0910	ND
2018-06-21	9590-904-1115	ND
2018-06-21	9590-905-0840	ND
2018-06-21	9590-906-0818	1.40 ppb
2018-06-21	9590-907-0953	1.50 ppb
2018-09-26	9590-900-1340	8.50 ppb
2018-09-26	9590-901-1300	1.70 ppb
2018-09-26	9590-902-0813	1.40 ppb
2018-09-26	9590-903-0937	12.0 ppb
2018-09-26	9590-904-1100	1.30 ppb
2018-09-26	9590-905-0840	1.40 ppb
2018-09-26	9590-906-1130	1.40 ppb
2018-09-26	9590-907-1028	1.40 ppb
2018-12-13	9590-900-1006	8.60 ppb
2018-12-13	9590-901-0854	ND
2018-12-13	9590-902-0828	ND
2018-12-13	9590-903-1132	8.50 ppb
2018-12-13	9590-904-1030	1.20 ppb
2018-12-13	9590-905-1108	ND
2018-12-13	9590-906-0804	ND
2018-12-13	9590-907-0923	1.30 ppb
2019-03-20	9590-900-1028	10.00 ppb
2019-03-20	9590-901-1320	3.10 ppb
2019-03-20	9590-902-0837	3.40 ppb
2019-03-20	9590-903-0936	8.90 ppb
2019-03-20	9590-904-1001	7.00 ppb
2019-03-20	9590-905-0822	2.90 ppb
2019-03-20	9590-906-0855	3.10 ppb
2019-03-20	9590-907-1102	8.10 ppb
2019-06-19	9590-900-1525	1.10 ppb
2019-06-19	9590-901-1155	ND
2019-06-19	9590-902-1252	ND
2019-06-19	9590-903-1334	1.20 ppb
2019-06-19	9590-904-1405	1.000 ppb
2019-06-19	9590-905-1124	1.000 ppb
2019-06-19	9590-906-1225	1.000 ppb
2019-06-19	9590-907-1445	1.30 ppb
2019-09-30	9590-900-1404	18.0 ppb
2019-09-30	9590-901-1641	ND
2019-09-30	9590-902-0740	ND
2019-09-30	9590-903-1559	19.0 ppb
2019-09-30	9590-904-1510	ND
2019-09-30	9590-905-0739	ND
2019-09-30	9590-906-1620	ND
2019-09-30	9590-907-1315	1.20 ppb
2019-12-18	9590-900-1250	6.80 ppb
2019-12-18	9590-901-1045	ND
2019-12-18	9590-902-1109	1.30 ppb
2019-12-18	9590-903-1201	4.00 ppb
2019-12-18	9590-904-1327	1.90 ppb
2019-12-18	9590-905-0958	1.30 ppb
2019-12-18	9590-906-1134	1.20 ppb
2019-12-18	9590-907-1226	1.30 ppb