Dibromochloromethane
City of San Jose - EVG/EDV/COY
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 | 12.4 ppb | 35 | 32 | ND - 17.5 ppb |
2015 | 16.5 ppb | 32 | 32 | 10.2 ppb - 29.0 ppb |
2016 | 11.5 ppb | 32 | 32 | 5.62 ppb - 18.7 ppb |
2017 | 6.78 ppb | 33 | 32 | ND - 10.5 ppb |
2018 | 15.5 ppb | 32 | 32 | 4.33 ppb - 22.2 ppb |
2019 | 11.7 ppb | 32 | 32 | 3.33 ppb - 20.6 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 |
---|---|---|
2014-01-14 | 9590-900-0805 | 17.0 ppb |
2014-01-14 | 9590-901-0845 | 15.0 ppb |
2014-01-14 | 9590-902-1055 | 17.0 ppb |
2014-01-14 | 9590-903-0942 | 14.0 ppb |
2014-01-14 | 9590-904-1118 | 16.0 ppb |
2014-01-14 | 9590-905-1033 | 17.0 ppb |
2014-01-14 | 9590-906-0915 | 14.0 ppb |
2014-01-14 | 9590-907-1006 | 17.0 ppb |
2014-01-21 | 9590-005-0914 | ND |
2014-01-21 | 9590-006-0839 | ND |
2014-02-18 | 9588-012-0902 | ND |
2014-04-08 | 1610-900-1118 | 10.8 ppb |
2014-04-08 | 1610-901-1047 | 10.3 ppb |
2014-04-08 | 1610-902-0835 | 10.4 ppb |
2014-04-08 | 1610-903-0955 | 10.5 ppb |
2014-04-08 | 1610-904-0815 | 9.38 ppb |
2014-04-08 | 1610-905-0856 | 11.2 ppb |
2014-04-08 | 1610-906-1024 | 9.87 ppb |
2014-04-08 | 1610-907-0925 | 11.4 ppb |
2014-07-08 | 1610-900-1137 | 15.2 ppb |
2014-07-08 | 1610-901-1120 | 14.5 ppb |
2014-07-08 | 1610-902-0904 | 16.7 ppb |
2014-07-08 | 1610-903-0950 | 14.0 ppb |
2014-07-08 | 1610-904-0843 | 17.5 ppb |
2014-07-08 | 1610-905-0925 | 16.2 ppb |
2014-07-08 | 1610-906-1059 | 13.9 ppb |
2014-07-08 | 1610-907-1015 | 16.0 ppb |
2014-10-14 | 1610-900-0805 | 12.0 ppb |
2014-10-14 | 1610-901-0855 | 11.6 ppb |
2014-10-14 | 1610-902-1102 | 12.3 ppb |
2014-10-14 | 1610-903-0930 | 12.4 ppb |
2014-10-14 | 1610-904-1120 | 13.4 ppb |
2014-10-14 | 1610-905-1040 | 10.7 ppb |
2014-10-14 | 1610-906-1015 | 11.8 ppb |
2014-10-14 | 1610-907-0950 | 13.6 ppb |
2015-01-13 | 1610-900-1105 | 13.5 ppb |
2015-01-13 | 1610-901-1042 | 14.4 ppb |
2015-01-13 | 1610-902-0840 | 14.3 ppb |
2015-01-13 | 1610-903-0946 | 14.4 ppb |
2015-01-13 | 1610-904-0818 | 13.2 ppb |
2015-01-13 | 1610-905-0900 | 14.3 ppb |
2015-01-13 | 1610-906-1016 | 11.2 ppb |
2015-01-13 | 1610-907-0926 | 14.1 ppb |
2015-04-14 | 1610-900-1129 | 19.8 ppb |
2015-04-14 | 1610-901-1050 | 17.1 ppb |
2015-04-14 | 1610-902-0810 | 20.1 ppb |
2015-04-14 | 1610-903-1025 | 16.2 ppb |
2015-04-14 | 1610-904-0845 | 23.0 ppb |
2015-04-14 | 1610-905-0935 | 23.1 ppb |
2015-04-14 | 1610-906-1110 | 20.9 ppb |
2015-04-14 | 1610-907-0956 | 20.6 ppb |
2015-07-14 | 1610-900-1040 | 18.4 ppb |
2015-07-14 | 1610-901-1110 | 18.5 ppb |
2015-07-14 | 1610-902-0835 | 26.6 ppb |
2015-07-14 | 1610-903-0925 | 19.4 ppb |
2015-07-14 | 1610-904-0810 | 29.0 ppb |
2015-07-14 | 1610-905-0855 | 18.7 ppb |
2015-07-14 | 1610-906-1015 | 19.3 ppb |
2015-07-14 | 1610-907-0940 | 18.2 ppb |
2015-10-13 | 1610-900-1020 | 10.6 ppb |
2015-10-13 | 1610-901-0904 | 12.4 ppb |
2015-10-13 | 1610-902-1200 | 10.8 ppb |
2015-10-13 | 1610-903-0944 | 12.3 ppb |
2015-10-13 | 1610-904-1218 | 10.7 ppb |
2015-10-13 | 1610-905-1135 | 11.7 ppb |
2015-10-13 | 1610-906-0830 | 11.5 ppb |
2015-10-13 | 1610-907-1053 | 10.2 ppb |
2016-01-12 | 1610-900-0905 | 17.3 ppb |
2016-01-12 | 1610-901-0840 | 16.6 ppb |
2016-01-12 | 1610-902-1059 | 18.7 ppb |
2016-01-12 | 1610-903-0807 | 17.5 ppb |
2016-01-12 | 1610-904-1122 | 16.9 ppb |
2016-01-12 | 1610-905-1030 | 18.1 ppb |
2016-01-12 | 1610-906-0942 | 18.1 ppb |
2016-01-12 | 1610-907-1010 | 18.1 ppb |
2016-04-12 | 1610-004-1200 | 15.3 ppb |
2016-04-12 | 1610-900-1049 | 13.3 ppb |
2016-04-12 | 1610-901-1026 | 12.6 ppb |
2016-04-12 | 1610-902-1144 | 14.7 ppb |
2016-04-12 | 1610-903-0930 | 12.9 ppb |
2016-04-12 | 1610-905-1124 | 14.3 ppb |
2016-04-12 | 1610-906-0903 | 13.1 ppb |
2016-04-12 | 1610-907-0954 | 13.4 ppb |
2016-07-12 | 1610-900-0820 | 6.69 ppb |
2016-07-12 | 1610-901-0853 | 6.57 ppb |
2016-07-12 | 1610-902-1133 | 5.71 ppb |
2016-07-12 | 1610-903-1015 | 6.45 ppb |
2016-07-12 | 1610-904-1156 | 5.62 ppb |
2016-07-12 | 1610-905-1110 | 6.26 ppb |
2016-07-12 | 1610-906-0921 | 5.76 ppb |
2016-07-12 | 1610-907-1042 | 6.09 ppb |
2016-10-11 | 1610-900-1256 | 9.26 ppb |
2016-10-11 | 1610-901-1236 | 7.77 ppb |
2016-10-11 | 1610-902-1036 | 7.39 ppb |
2016-10-11 | 1610-903-1148 | 8.10 ppb |
2016-10-11 | 1610-904-1007 | 8.61 ppb |
2016-10-11 | 1610-905-1107 | 8.46 ppb |
2016-10-11 | 1610-906-1217 | 8.19 ppb |
2016-10-11 | 1610-907-1126 | 10.4 ppb |
2017-01-10 | 1610-900-0945 | 7.71 ppb |
2017-01-10 | 1610-901-0922 | 7.31 ppb |
2017-01-10 | 1610-902-1040 | 7.96 ppb |
2017-01-10 | 1610-903-0801 | 7.52 ppb |
2017-01-10 | 1610-904-1109 | 8.74 ppb |
2017-01-10 | 1610-905-1013 | 8.57 ppb |
2017-01-10 | 1610-906-0821 | 7.75 ppb |
2017-01-10 | 1610-907-0854 | 8.45 ppb |
2017-04-11 | 1610-900-0825 | 10.2 ppb |
2017-04-11 | 1610-901-0850 | 10.0 ppb |
2017-04-11 | 1610-902-0946 | 9.63 ppb |
2017-04-11 | 1610-903-1125 | 9.05 ppb |
2017-04-11 | 1610-904-1010 | 8.85 ppb |
2017-04-11 | 1610-905-1035 | 10.5 ppb |
2017-04-11 | 1610-906-0915 | 9.24 ppb |
2017-04-11 | 1610-907-1058 | 10.3 ppb |
2017-07-11 | 1610-900-0847 | 6.17 ppb |
2017-07-11 | 1610-901-0933 | 6.43 ppb |
2017-07-11 | 1610-902-1114 | 4.55 ppb |
2017-07-11 | 1610-903-1018 | 6.81 ppb |
2017-07-11 | 1610-904-1126 | 3.89 ppb |
2017-07-11 | 1610-905-1100 | 4.18 ppb |
2017-07-11 | 1610-906-0958 | 6.71 ppb |
2017-07-11 | 1610-907-1044 | 4.48 ppb |
2017-09-12 | 5867-004-0943 | ND |
2017-10-11 | 1610-900-0810 | 5.60 ppb |
2017-10-11 | 1610-901-0839 | 6.51 ppb |
2017-10-11 | 1610-902-1110 | 3.73 ppb |
2017-10-11 | 1610-903-0935 | 6.04 ppb |
2017-10-11 | 1610-904-1131 | 3.25 ppb |
2017-10-11 | 1610-905-1045 | 3.92 ppb |
2017-10-11 | 1610-906-0910 | 5.81 ppb |
2017-10-11 | 1610-907-1005 | 3.85 ppb |
2018-01-09 | 1610-900-1250 | 13.3 ppb |
2018-01-09 | 1610-901-1221 | 9.44 ppb |
2018-01-09 | 1610-902-0842 | 15.4 ppb |
2018-01-09 | 1610-903-1116 | 4.33 ppb |
2018-01-09 | 1610-904-0925 | 10.4 ppb |
2018-01-09 | 1610-905-1000 | 14.8 ppb |
2018-01-09 | 1610-906-1151 | 5.97 ppb |
2018-01-09 | 1610-907-1041 | 17.1 ppb |
2018-04-09 | 1610-900-0856 | 18.2 ppb |
2018-04-09 | 1610-901-0919 | 18.5 ppb |
2018-04-09 | 1610-902-1100 | 21.1 ppb |
2018-04-09 | 1610-903-1001 | 13.1 ppb |
2018-04-09 | 1610-904-1120 | 16.2 ppb |
2018-04-09 | 1610-905-1041 | 19.1 ppb |
2018-04-09 | 1610-906-0941 | 14.2 ppb |
2018-04-09 | 1610-907-1020 | 19.3 ppb |
2018-07-10 | 1610-900-1027 | 21.0 ppb |
2018-07-10 | 1610-901-1008 | 21.0 ppb |
2018-07-10 | 1610-902-0816 | 22.2 ppb |
2018-07-10 | 1610-903-0925 | 21.8 ppb |
2018-07-10 | 1610-904-0800 | 18.5 ppb |
2018-07-10 | 1610-905-0851 | 18.9 ppb |
2018-07-10 | 1610-906-0948 | 20.1 ppb |
2018-07-10 | 1610-907-0906 | 19.2 ppb |
2018-10-09 | 1610-900-1033 | 13.5 ppb |
2018-10-09 | 1610-901-1001 | 12.6 ppb |
2018-10-09 | 1610-902-0816 | 13.1 ppb |
2018-10-09 | 1610-903-0919 | 11.7 ppb |
2018-10-09 | 1610-904-0830 | 13.5 ppb |
2018-10-09 | 1610-905-0850 | 12.9 ppb |
2018-10-09 | 1610-906-0943 | 10.7 ppb |
2018-10-09 | 1610-907-0905 | 13.2 ppb |
2019-01-08 | 1610-900-0837 | 14.4 ppb |
2019-01-08 | 1610-901-0900 | 16.6 ppb |
2019-01-08 | 1610-902-0940 | 20.0 ppb |
2019-01-08 | 1610-903-1058 | 16.5 ppb |
2019-01-08 | 1610-904-1002 | 18.3 ppb |
2019-01-08 | 1610-905-1142 | 20.2 ppb |
2019-01-08 | 1610-906-1029 | 15.7 ppb |
2019-01-08 | 1610-907-1118 | 20.6 ppb |
2019-04-09 | 1610-900-1102 | 14.4 ppb |
2019-04-09 | 1610-901-0816 | 8.87 ppb |
2019-04-09 | 1610-902-1018 | 15.7 ppb |
2019-04-09 | 1610-903-0921 | 9.32 ppb |
2019-04-09 | 1610-904-1038 | 12.3 ppb |
2019-04-09 | 1610-905-0959 | 13.2 ppb |
2019-04-09 | 1610-906-0841 | 7.55 ppb |
2019-04-09 | 1610-907-0940 | 17.0 ppb |
2019-07-09 | 1610-900-0800 | 9.57 ppb |
2019-07-09 | 1610-901-0825 | 8.69 ppb |
2019-07-09 | 1610-902-1025 | 10.5 ppb |
2019-07-09 | 1610-903-0920 | 10.5 ppb |
2019-07-09 | 1610-904-1041 | 10.0 ppb |
2019-07-09 | 1610-905-1006 | 10.7 ppb |
2019-07-09 | 1610-906-0855 | 9.96 ppb |
2019-07-09 | 1610-907-0942 | 11.5 ppb |
2019-10-08 | 1610-900-0749 | 8.75 ppb |
2019-10-08 | 1610-901-0819 | 7.64 ppb |
2019-10-08 | 1610-902-1027 | 7.04 ppb |
2019-10-08 | 1610-903-0920 | 9.12 ppb |
2019-10-08 | 1610-904-1045 | 3.33 ppb |
2019-10-08 | 1610-905-0958 | 3.35 ppb |
2019-10-08 | 1610-906-0859 | 6.47 ppb |
2019-10-08 | 1610-907-0939 | 5.15 ppb |