Bromodichloromethane
City of San Jose - EVG/EDV/COY
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 5.60 ppb | 35 | 32 | ND - 7.54 ppb |
2015 | 9.14 ppb | 32 | 32 | 7.48 ppb - 11.8 ppb |
2016 | 7.70 ppb | 32 | 32 | 4.07 ppb - 15.1 ppb |
2017 | 6.55 ppb | 33 | 32 | ND - 10.3 ppb |
2018 | 8.74 ppb | 32 | 32 | 4.37 ppb - 14.2 ppb |
2019 | 7.18 ppb | 32 | 32 | 4.61 ppb - 12.4 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 |
---|---|---|
2014-01-14 | 9590-900-0805 | 6.30 ppb |
2014-01-14 | 9590-901-0845 | 5.50 ppb |
2014-01-14 | 9590-902-1055 | 6.00 ppb |
2014-01-14 | 9590-903-0942 | 5.40 ppb |
2014-01-14 | 9590-904-1118 | 6.00 ppb |
2014-01-14 | 9590-905-1033 | 6.50 ppb |
2014-01-14 | 9590-906-0915 | 5.40 ppb |
2014-01-14 | 9590-907-1006 | 6.30 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 | 4.59 ppb |
2014-04-08 | 1610-901-1047 | 4.59 ppb |
2014-04-08 | 1610-902-0835 | 4.32 ppb |
2014-04-08 | 1610-903-0955 | 4.50 ppb |
2014-04-08 | 1610-904-0815 | 4.17 ppb |
2014-04-08 | 1610-905-0856 | 4.85 ppb |
2014-04-08 | 1610-906-1024 | 4.27 ppb |
2014-04-08 | 1610-907-0925 | 4.65 ppb |
2014-07-08 | 1610-900-1137 | 7.38 ppb |
2014-07-08 | 1610-901-1120 | 7.27 ppb |
2014-07-08 | 1610-902-0904 | 7.09 ppb |
2014-07-08 | 1610-903-0950 | 7.08 ppb |
2014-07-08 | 1610-904-0843 | 7.33 ppb |
2014-07-08 | 1610-905-0925 | 7.41 ppb |
2014-07-08 | 1610-906-1059 | 7.07 ppb |
2014-07-08 | 1610-907-1015 | 7.54 ppb |
2014-10-14 | 1610-900-0805 | 6.91 ppb |
2014-10-14 | 1610-901-0855 | 6.66 ppb |
2014-10-14 | 1610-902-1102 | 6.58 ppb |
2014-10-14 | 1610-903-0930 | 7.05 ppb |
2014-10-14 | 1610-904-1120 | 7.38 ppb |
2014-10-14 | 1610-905-1040 | 5.98 ppb |
2014-10-14 | 1610-906-1015 | 6.62 ppb |
2014-10-14 | 1610-907-0950 | 7.42 ppb |
2015-01-13 | 1610-900-1105 | 9.67 ppb |
2015-01-13 | 1610-901-1042 | 9.76 ppb |
2015-01-13 | 1610-902-0840 | 9.53 ppb |
2015-01-13 | 1610-903-0946 | 9.80 ppb |
2015-01-13 | 1610-904-0818 | 9.10 ppb |
2015-01-13 | 1610-905-0900 | 9.73 ppb |
2015-01-13 | 1610-906-1016 | 8.79 ppb |
2015-01-13 | 1610-907-0926 | 9.52 ppb |
2015-04-14 | 1610-900-1129 | 9.51 ppb |
2015-04-14 | 1610-901-1050 | 10.3 ppb |
2015-04-14 | 1610-902-0810 | 9.52 ppb |
2015-04-14 | 1610-903-1025 | 11.4 ppb |
2015-04-14 | 1610-904-0845 | 11.3 ppb |
2015-04-14 | 1610-905-0935 | 11.5 ppb |
2015-04-14 | 1610-906-1110 | 9.84 ppb |
2015-04-14 | 1610-907-0956 | 10.1 ppb |
2015-07-14 | 1610-900-1040 | 8.37 ppb |
2015-07-14 | 1610-901-1110 | 8.07 ppb |
2015-07-14 | 1610-902-0835 | 10.9 ppb |
2015-07-14 | 1610-903-0925 | 8.53 ppb |
2015-07-14 | 1610-904-0810 | 11.8 ppb |
2015-07-14 | 1610-905-0855 | 8.25 ppb |
2015-07-14 | 1610-906-1015 | 7.85 ppb |
2015-07-14 | 1610-907-0940 | 7.66 ppb |
2015-10-13 | 1610-900-1020 | 7.67 ppb |
2015-10-13 | 1610-901-0904 | 7.65 ppb |
2015-10-13 | 1610-902-1200 | 7.52 ppb |
2015-10-13 | 1610-903-0944 | 7.99 ppb |
2015-10-13 | 1610-904-1218 | 7.68 ppb |
2015-10-13 | 1610-905-1135 | 7.98 ppb |
2015-10-13 | 1610-906-0830 | 7.68 ppb |
2015-10-13 | 1610-907-1053 | 7.48 ppb |
2016-01-12 | 1610-900-0905 | 5.66 ppb |
2016-01-12 | 1610-901-0840 | 6.46 ppb |
2016-01-12 | 1610-902-1059 | 5.30 ppb |
2016-01-12 | 1610-903-0807 | 6.59 ppb |
2016-01-12 | 1610-904-1122 | 5.26 ppb |
2016-01-12 | 1610-905-1030 | 6.08 ppb |
2016-01-12 | 1610-906-0942 | 6.55 ppb |
2016-01-12 | 1610-907-1010 | 5.95 ppb |
2016-04-12 | 1610-004-1200 | 15.1 ppb |
2016-04-12 | 1610-900-1049 | 14.1 ppb |
2016-04-12 | 1610-901-1026 | 13.4 ppb |
2016-04-12 | 1610-902-1144 | 14.8 ppb |
2016-04-12 | 1610-903-0930 | 13.8 ppb |
2016-04-12 | 1610-905-1124 | 14.3 ppb |
2016-04-12 | 1610-906-0903 | 13.6 ppb |
2016-04-12 | 1610-907-0954 | 12.8 ppb |
2016-07-12 | 1610-900-0820 | 6.53 ppb |
2016-07-12 | 1610-901-0853 | 6.47 ppb |
2016-07-12 | 1610-902-1133 | 5.95 ppb |
2016-07-12 | 1610-903-1015 | 6.21 ppb |
2016-07-12 | 1610-904-1156 | 6.01 ppb |
2016-07-12 | 1610-905-1110 | 6.34 ppb |
2016-07-12 | 1610-906-0921 | 5.59 ppb |
2016-07-12 | 1610-907-1042 | 6.41 ppb |
2016-10-11 | 1610-900-1256 | 4.91 ppb |
2016-10-11 | 1610-901-1236 | 4.57 ppb |
2016-10-11 | 1610-902-1036 | 4.07 ppb |
2016-10-11 | 1610-903-1148 | 4.68 ppb |
2016-10-11 | 1610-904-1007 | 4.94 ppb |
2016-10-11 | 1610-905-1107 | 4.43 ppb |
2016-10-11 | 1610-906-1217 | 4.74 ppb |
2016-10-11 | 1610-907-1126 | 4.98 ppb |
2017-01-10 | 1610-900-0945 | 5.30 ppb |
2017-01-10 | 1610-901-0922 | 4.52 ppb |
2017-01-10 | 1610-902-1040 | 5.04 ppb |
2017-01-10 | 1610-903-0801 | 4.86 ppb |
2017-01-10 | 1610-904-1109 | 7.38 ppb |
2017-01-10 | 1610-905-1013 | 6.37 ppb |
2017-01-10 | 1610-906-0821 | 5.01 ppb |
2017-01-10 | 1610-907-0854 | 7.58 ppb |
2017-04-11 | 1610-900-0825 | 6.47 ppb |
2017-04-11 | 1610-901-0850 | 6.09 ppb |
2017-04-11 | 1610-902-0946 | 5.68 ppb |
2017-04-11 | 1610-903-1125 | 5.95 ppb |
2017-04-11 | 1610-904-1010 | 5.79 ppb |
2017-04-11 | 1610-905-1035 | 6.44 ppb |
2017-04-11 | 1610-906-0915 | 6.17 ppb |
2017-04-11 | 1610-907-1058 | 6.47 ppb |
2017-07-11 | 1610-900-0847 | 6.43 ppb |
2017-07-11 | 1610-901-0933 | 6.34 ppb |
2017-07-11 | 1610-902-1114 | 5.36 ppb |
2017-07-11 | 1610-903-1018 | 6.41 ppb |
2017-07-11 | 1610-904-1126 | 5.64 ppb |
2017-07-11 | 1610-905-1100 | 5.93 ppb |
2017-07-11 | 1610-906-0958 | 6.29 ppb |
2017-07-11 | 1610-907-1044 | 6.15 ppb |
2017-09-12 | 5867-004-0943 | ND |
2017-10-11 | 1610-900-0810 | 10.3 ppb |
2017-10-11 | 1610-901-0839 | 9.15 ppb |
2017-10-11 | 1610-902-1110 | 8.61 ppb |
2017-10-11 | 1610-903-0935 | 8.79 ppb |
2017-10-11 | 1610-904-1131 | 8.55 ppb |
2017-10-11 | 1610-905-1045 | 9.36 ppb |
2017-10-11 | 1610-906-0910 | 8.49 ppb |
2017-10-11 | 1610-907-1005 | 9.16 ppb |
2018-01-09 | 1610-900-1250 | 7.88 ppb |
2018-01-09 | 1610-901-1221 | 6.45 ppb |
2018-01-09 | 1610-902-0842 | 8.53 ppb |
2018-01-09 | 1610-903-1116 | 4.37 ppb |
2018-01-09 | 1610-904-0925 | 5.61 ppb |
2018-01-09 | 1610-905-1000 | 8.41 ppb |
2018-01-09 | 1610-906-1151 | 5.14 ppb |
2018-01-09 | 1610-907-1041 | 8.48 ppb |
2018-04-09 | 1610-900-0856 | 9.89 ppb |
2018-04-09 | 1610-901-0919 | 9.35 ppb |
2018-04-09 | 1610-902-1100 | 12.5 ppb |
2018-04-09 | 1610-903-1001 | 9.09 ppb |
2018-04-09 | 1610-904-1120 | 9.42 ppb |
2018-04-09 | 1610-905-1041 | 10.6 ppb |
2018-04-09 | 1610-906-0941 | 9.33 ppb |
2018-04-09 | 1610-907-1020 | 11.4 ppb |
2018-07-10 | 1610-900-1027 | 13.0 ppb |
2018-07-10 | 1610-901-1008 | 13.3 ppb |
2018-07-10 | 1610-902-0816 | 12.6 ppb |
2018-07-10 | 1610-903-0925 | 14.0 ppb |
2018-07-10 | 1610-904-0800 | 9.65 ppb |
2018-07-10 | 1610-905-0851 | 9.91 ppb |
2018-07-10 | 1610-906-0948 | 14.2 ppb |
2018-07-10 | 1610-907-0906 | 11.1 ppb |
2018-10-09 | 1610-900-1033 | 5.81 ppb |
2018-10-09 | 1610-901-1001 | 5.56 ppb |
2018-10-09 | 1610-902-0816 | 5.67 ppb |
2018-10-09 | 1610-903-0919 | 5.74 ppb |
2018-10-09 | 1610-904-0830 | 6.02 ppb |
2018-10-09 | 1610-905-0850 | 5.56 ppb |
2018-10-09 | 1610-906-0943 | 5.53 ppb |
2018-10-09 | 1610-907-0905 | 5.72 ppb |
2019-01-08 | 1610-900-0837 | 5.29 ppb |
2019-01-08 | 1610-901-0900 | 6.09 ppb |
2019-01-08 | 1610-902-0940 | 6.46 ppb |
2019-01-08 | 1610-903-1058 | 6.20 ppb |
2019-01-08 | 1610-904-1002 | 6.39 ppb |
2019-01-08 | 1610-905-1142 | 7.19 ppb |
2019-01-08 | 1610-906-1029 | 6.25 ppb |
2019-01-08 | 1610-907-1118 | 6.88 ppb |
2019-04-09 | 1610-900-1102 | 9.38 ppb |
2019-04-09 | 1610-901-0816 | 11.4 ppb |
2019-04-09 | 1610-902-1018 | 10.3 ppb |
2019-04-09 | 1610-903-0921 | 12.0 ppb |
2019-04-09 | 1610-904-1038 | 6.80 ppb |
2019-04-09 | 1610-905-0959 | 10.5 ppb |
2019-04-09 | 1610-906-0841 | 12.4 ppb |
2019-04-09 | 1610-907-0940 | 9.82 ppb |
2019-07-09 | 1610-900-0800 | 4.95 ppb |
2019-07-09 | 1610-901-0825 | 4.97 ppb |
2019-07-09 | 1610-902-1025 | 5.45 ppb |
2019-07-09 | 1610-903-0920 | 5.64 ppb |
2019-07-09 | 1610-904-1041 | 5.26 ppb |
2019-07-09 | 1610-905-1006 | 5.78 ppb |
2019-07-09 | 1610-906-0855 | 5.34 ppb |
2019-07-09 | 1610-907-0942 | 5.92 ppb |
2019-10-08 | 1610-900-0749 | 8.52 ppb |
2019-10-08 | 1610-901-0819 | 7.74 ppb |
2019-10-08 | 1610-902-1027 | 6.95 ppb |
2019-10-08 | 1610-903-0920 | 8.70 ppb |
2019-10-08 | 1610-904-1045 | 4.61 ppb |
2019-10-08 | 1610-905-0958 | 4.67 ppb |
2019-10-08 | 1610-906-0859 | 6.32 ppb |
2019-10-08 | 1610-907-0939 | 5.63 ppb |