Dibromochloromethane
City of Santa Clara
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 7.05 ppb | 37 | 17 | ND - 34.0 ppb |
2015 | 6.53 ppb | 40 | 15 | ND - 33.0 ppb |
2016 | 6.64 ppb | 50 | 17 | ND - 38.0 ppb |
2017 | 3.75 ppb | 37 | 13 | ND - 24.0 ppb |
2018 | 4.51 ppb | 41 | 15 | ND - 23.0 ppb |
2019 | 4.50 ppb | 41 | 14 | ND - 29.0 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 |
---|---|---|
2014-01-22 | 9590-900-1044 | 4.50 ppb |
2014-01-22 | 9590-901-1030 | 4.20 ppb |
2014-01-22 | 9590-902-1105 | 4.90 ppb |
2014-01-22 | 9590-903-1015 | ND |
2014-01-22 | 9590-904-0935 | ND |
2014-01-22 | 9590-905-0834 | 8.40 ppb |
2014-01-22 | 9590-906-0854 | 17.0 ppb |
2014-01-22 | 9590-907-0955 | 11.0 ppb |
2014-04-02 | 9590-030-1035 | ND |
2014-04-23 | 9590-900-1025 | ND |
2014-04-23 | 9590-901-1010 | ND |
2014-04-23 | 9590-902-1040 | ND |
2014-04-23 | 9590-903-0955 | 1.10 ppb |
2014-04-23 | 9590-904-0910 | 5.40 ppb |
2014-04-23 | 9590-905-0835 | 34.0 ppb |
2014-04-23 | 9590-906-0850 | 29.0 ppb |
2014-04-23 | 9590-907-0930 | ND |
2014-07-23 | 9590-900-1340 | ND |
2014-07-23 | 9590-901-0905 | ND |
2014-07-23 | 9590-902-0945 | ND |
2014-07-23 | 9590-903-0845 | ND |
2014-07-23 | 9590-904-1005 | ND |
2014-07-23 | 9590-905-1025 | ND |
2014-07-23 | 9590-906-1045 | 25.0 ppb |
2014-07-23 | 9590-907-1130 | 26.0 ppb |
2014-08-26 | 9590-027-1050 | ND |
2014-08-26 | 9590-034-0930 | ND |
2014-08-27 | 9590-011-0905 | ND |
2014-08-27 | 9590-036-1030 | ND |
2014-10-24 | 9590-900-0910 | ND |
2014-10-24 | 9590-901-0930 | ND |
2014-10-24 | 9590-902-0855 | ND |
2014-10-24 | 9590-903-0915 | 1.20 ppb |
2014-10-24 | 9590-904-1025 | 15.0 ppb |
2014-10-24 | 9590-905-0935 | 26.0 ppb |
2014-10-24 | 9590-906-0955 | 25.0 ppb |
2014-10-24 | 9590-907-1045 | 23.0 ppb |
2015-01-21 | 9590-900-1215 | 1.50 ppb |
2015-01-21 | 9590-901-1142 | 1.50 ppb |
2015-01-21 | 9590-902-1126 | 1.50 ppb |
2015-01-21 | 9590-903-1150 | ND |
2015-01-21 | 9590-904-0948 | 1.20 ppb |
2015-01-21 | 9590-905-1003 | ND |
2015-01-21 | 9590-906-1026 | 23.0 ppb |
2015-01-21 | 9590-907-0926 | 10.00 ppb |
2015-04-22 | 9590-900-0945 | ND |
2015-04-22 | 9590-901-0915 | ND |
2015-04-22 | 9590-902-1010 | ND |
2015-04-22 | 9590-903-0858 | ND |
2015-04-22 | 9590-904-1125 | 7.40 ppb |
2015-04-22 | 9590-905-1410 | ND |
2015-04-22 | 9590-906-1435 | 23.0 ppb |
2015-04-22 | 9590-907-1140 | ND |
2015-07-23 | 9590-900-1410 | ND |
2015-07-23 | 9590-901-1115 | ND |
2015-07-23 | 9590-902-1345 | ND |
2015-07-23 | 9590-903-1050 | ND |
2015-07-23 | 9590-904-0950 | 33.0 ppb |
2015-07-23 | 9590-905-0850 | 32.0 ppb |
2015-07-23 | 9590-906-0910 | 31.0 ppb |
2015-07-23 | 9590-907-1015 | 19.0 ppb |
2015-08-17 | 9590-004-0925 | ND |
2015-08-17 | 9590-019-1045 | ND |
2015-08-19 | 9590-002-0955 | ND |
2015-08-19 | 9590-015-1100 | ND |
2015-08-20 | 9590-007-1120 | ND |
2015-08-20 | 9590-031-1010 | ND |
2015-08-24 | 9590-013-0950 | ND |
2015-08-24 | 9590-014-1045 | ND |
2015-10-21 | 9590-900-1321 | ND |
2015-10-21 | 9590-901-1125 | ND |
2015-10-21 | 9590-902-1340 | ND |
2015-10-21 | 9590-903-1108 | ND |
2015-10-21 | 9590-904-1022 | 23.0 ppb |
2015-10-21 | 9590-905-0923 | ND |
2015-10-21 | 9590-906-0957 | 27.0 ppb |
2015-10-21 | 9590-907-1041 | 27.0 ppb |
2016-01-20 | 9590-900-1000 | 1.10 ppb |
2016-01-20 | 9590-901-0935 | ND |
2016-01-20 | 9590-902-1020 | 1.10 ppb |
2016-01-20 | 9590-903-0915 | ND |
2016-01-20 | 9590-904-1356 | 16.0 ppb |
2016-01-20 | 9590-905-1045 | 32.0 ppb |
2016-01-20 | 9590-906-1102 | 38.0 ppb |
2016-01-20 | 9590-907-1413 | 32.0 ppb |
2016-01-27 | 9590-900-1127 | ND |
2016-01-27 | 9590-901-1105 | ND |
2016-01-27 | 9590-902-1146 | ND |
2016-01-27 | 9590-903-1050 | ND |
2016-01-27 | 9590-904-1206 | ND |
2016-01-27 | 9590-905-1218 | ND |
2016-01-27 | 9590-906-1232 | 32.0 ppb |
2016-01-27 | 9590-907-1356 | 34.0 ppb |
2016-04-20 | 9590-900-1021 | ND |
2016-04-20 | 9590-901-1002 | ND |
2016-04-20 | 9590-902-1043 | ND |
2016-04-20 | 9590-903-0942 | ND |
2016-04-20 | 9590-904-1159 | ND |
2016-04-20 | 9590-905-1106 | ND |
2016-04-20 | 9590-906-1129 | 19.0 ppb |
2016-04-20 | 9590-907-1224 | 19.0 ppb |
2016-07-20 | 9590-900-1103 | ND |
2016-07-20 | 9590-901-0827 | ND |
2016-07-20 | 9590-902-0855 | ND |
2016-07-20 | 9590-903-0809 | ND |
2016-07-20 | 9590-904-1007 | 9.00 ppb |
2016-07-20 | 9590-905-0925 | 12.0 ppb |
2016-07-20 | 9590-906-0942 | 12.0 ppb |
2016-07-20 | 9590-907-1022 | ND |
2016-08-15 | 9590-010-1055 | ND |
2016-08-15 | 9590-016-1010 | ND |
2016-08-15 | 9590-018-0915 | ND |
2016-08-17 | 9590-005-1127 | ND |
2016-08-17 | 9590-025-0918 | ND |
2016-08-17 | 9590-029-1016 | ND |
2016-08-18 | 9590-008-0956 | ND |
2016-08-18 | 9590-012-1035 | ND |
2016-08-18 | 9590-023-0920 | ND |
2016-09-28 | 9590-026-0855 | ND |
2016-10-26 | 9590-900-0927 | ND |
2016-10-26 | 9590-901-0914 | ND |
2016-10-26 | 9590-902-0940 | ND |
2016-10-26 | 9590-903-0901 | ND |
2016-10-26 | 9590-904-1055 | 23.0 ppb |
2016-10-26 | 9590-905-1003 | 7.70 ppb |
2016-10-26 | 9590-906-1021 | 22.0 ppb |
2016-10-26 | 9590-907-1108 | 22.0 ppb |
2017-01-25 | 9590-900-1128 | ND |
2017-01-25 | 9590-901-1201 | ND |
2017-01-25 | 9590-902-1054 | ND |
2017-01-25 | 9590-903-1146 | ND |
2017-01-25 | 9590-904-0959 | ND |
2017-01-25 | 9590-905-0852 | 11.0 ppb |
2017-01-25 | 9590-906-0915 | 24.0 ppb |
2017-01-25 | 9590-907-1028 | 13.0 ppb |
2017-04-19 | 9590-900-1200 | ND |
2017-04-19 | 9590-901-1048 | ND |
2017-04-19 | 9590-902-1219 | ND |
2017-04-19 | 9590-903-1035 | ND |
2017-04-19 | 9590-904-0952 | ND |
2017-04-19 | 9590-905-0838 | 5.80 ppb |
2017-04-19 | 9590-906-0903 | 19.0 ppb |
2017-04-19 | 9590-907-1010 | 22.0 ppb |
2017-04-24 | 9590-030-1120 | ND |
2017-08-02 | 9590-900-1053 | ND |
2017-08-02 | 9590-901-1038 | ND |
2017-08-02 | 9590-902-1118 | ND |
2017-08-02 | 9590-903-1025 | ND |
2017-08-02 | 9590-904-0938 | 10.00 ppb |
2017-08-02 | 9590-905-0841 | 12.0 ppb |
2017-08-02 | 9590-906-0901 | 10.00 ppb |
2017-08-02 | 9590-907-0953 | ND |
2017-08-16 | 9590-011-0901 | ND |
2017-08-16 | 9590-027-1012 | ND |
2017-08-17 | 9590-036-1055 | ND |
2017-10-04 | 9590-034-1007 | ND |
2017-10-18 | 9590-900-1014 | ND |
2017-10-18 | 9590-901-0929 | ND |
2017-10-18 | 9590-902-0959 | ND |
2017-10-18 | 9590-903-0914 | ND |
2017-10-18 | 9590-904-1144 | 3.00 ppb |
2017-10-18 | 9590-905-1155 | 3.40 ppb |
2017-10-18 | 9590-906-1253 | 3.30 ppb |
2017-10-18 | 9590-907-1212 | 2.10 ppb |
2018-01-23 | 9590-022-1010 | ND |
2018-01-29 | 9590-900-0755 | ND |
2018-01-29 | 9590-901-0843 | ND |
2018-01-29 | 9590-902-0817 | ND |
2018-01-29 | 9590-903-0832 | 1.90 ppb |
2018-01-29 | 9590-904-1008 | ND |
2018-01-29 | 9590-905-0909 | 8.30 ppb |
2018-01-29 | 9590-906-0928 | 21.0 ppb |
2018-01-29 | 9590-907-1023 | 23.0 ppb |
2018-05-23 | 9590-900-1004 | ND |
2018-05-25 | 9590-901-0947 | ND |
2018-05-25 | 9590-902-1025 | 5.20 ppb |
2018-05-25 | 9590-903-0939 | ND |
2018-05-25 | 9590-904-0608 | 7.20 ppb |
2018-05-25 | 9590-905-0818 | 10.00 ppb |
2018-05-25 | 9590-906-0835 | 9.80 ppb |
2018-05-25 | 9590-907-0913 | ND |
2018-07-25 | 9590-900-0900 | ND |
2018-07-25 | 9590-901-0848 | ND |
2018-07-25 | 9590-902-0915 | 4.50 ppb |
2018-07-25 | 9590-903-0838 | ND |
2018-07-25 | 9590-904-1015 | 13.0 ppb |
2018-07-25 | 9590-905-0939 | ND |
2018-07-25 | 9590-906-0954 | 14.0 ppb |
2018-07-25 | 9590-907-1027 | 12.0 ppb |
2018-08-13 | 9590-004-0908 | ND |
2018-08-13 | 9590-026-1047 | ND |
2018-08-16 | 9590-002-1000 | ND |
2018-08-16 | 9590-031-0900 | ND |
2018-08-20 | 9590-013-1005 | ND |
2018-08-20 | 9590-014-0840 | ND |
2018-08-20 | 9590-019-1042 | ND |
2018-09-12 | 9590-007-1011 | ND |
2018-10-17 | 9590-900-0930 | ND |
2018-10-17 | 9590-901-0904 | ND |
2018-10-17 | 9590-902-0946 | ND |
2018-10-17 | 9590-903-0850 | ND |
2018-10-17 | 9590-904-1007 | 17.0 ppb |
2018-10-17 | 9590-905-1019 | 19.0 ppb |
2018-10-17 | 9590-906-1054 | 19.0 ppb |
2018-10-17 | 9590-907-1117 | ND |
2019-01-16 | 9590-900-0957 | ND |
2019-01-16 | 9590-901-0934 | ND |
2019-01-16 | 9590-902-1016 | 3.20 ppb |
2019-01-16 | 9590-903-0924 | 1.10 ppb |
2019-01-16 | 9590-904-0741 | 18.0 ppb |
2019-01-16 | 9590-905-0753 | 29.0 ppb |
2019-01-16 | 9590-906-0809 | 26.0 ppb |
2019-01-16 | 9590-907-0852 | ND |
2019-04-17 | 9590-900-0934 | ND |
2019-04-17 | 9590-901-0918 | ND |
2019-04-17 | 9590-902-0949 | 5.50 ppb |
2019-04-17 | 9590-903-0906 | ND |
2019-04-17 | 9590-904-1012 | 2.60 ppb |
2019-04-17 | 9590-905-1028 | ND |
2019-04-17 | 9590-906-1055 | 18.0 ppb |
2019-04-17 | 9590-907-1119 | 20.0 ppb |
2019-07-15 | 9590-900-1116 | ND |
2019-07-15 | 9590-901-1056 | ND |
2019-07-15 | 9590-902-1129 | ND |
2019-07-15 | 9590-903-1040 | ND |
2019-07-15 | 9590-904-0949 | 18.0 ppb |
2019-07-15 | 9590-905-1009 | 18.0 ppb |
2019-07-15 | 9590-906-0926 | 18.0 ppb |
2019-07-15 | 9590-907-0843 | ND |
2019-08-14 | 9590-022-0905 | ND |
2019-08-14 | 9590-030-1002 | ND |
2019-08-20 | 9590-008-0945 | ND |
2019-08-20 | 9590-018-1115 | ND |
2019-08-20 | 9590-023-1200 | ND |
2019-08-21 | 9590-016-1009 | ND |
2019-08-21 | 9590-029-0905 | ND |
2019-08-22 | 9590-010-0920 | ND |
2019-10-01 | 9590-012-1031 | ND |
2019-10-15 | 9590-900-0814 | ND |
2019-10-15 | 9590-901-0758 | ND |
2019-10-15 | 9590-902-0834 | ND |
2019-10-15 | 9590-903-0745 | ND |
2019-10-15 | 9590-904-1017 | 2.70 ppb |
2019-10-15 | 9590-905-0941 | ND |
2019-10-15 | 9590-906-0958 | 4.40 ppb |
2019-10-15 | 9590-907-1028 | ND |