Bromoform
City of San Jose - EVG/EDV/COY
Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform 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 | 15.7 ppb | 35 | 32 | ND - 25.0 ppb |
2015 | 14.0 ppb | 32 | 32 | 6.28 ppb - 30.9 ppb |
2016 | 12.1 ppb | 32 | 32 | 2.54 ppb - 38.9 ppb |
2017 | 5.77 ppb | 33 | 26 | ND - 12.9 ppb |
2018 | 11.3 ppb | 32 | 32 | 2.58 ppb - 18.5 ppb |
2019 | 10.9 ppb | 32 | 30 | ND - 23.5 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.5 ppb
The EWG Health Guideline of 0.5 ppb for bromoform 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 | 25.0 ppb |
2014-01-14 | 9590-901-0845 | 23.0 ppb |
2014-01-14 | 9590-902-1055 | 24.0 ppb |
2014-01-14 | 9590-903-0942 | 22.0 ppb |
2014-01-14 | 9590-904-1118 | 19.0 ppb |
2014-01-14 | 9590-905-1033 | 21.0 ppb |
2014-01-14 | 9590-906-0915 | 23.0 ppb |
2014-01-14 | 9590-907-1006 | 25.0 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 | 21.5 ppb |
2014-04-08 | 1610-901-1047 | 20.9 ppb |
2014-04-08 | 1610-902-0835 | 20.8 ppb |
2014-04-08 | 1610-903-0955 | 20.9 ppb |
2014-04-08 | 1610-904-0815 | 14.0 ppb |
2014-04-08 | 1610-905-0856 | 22.5 ppb |
2014-04-08 | 1610-906-1024 | 20.6 ppb |
2014-04-08 | 1610-907-0925 | 24.3 ppb |
2014-07-08 | 1610-900-1137 | 15.6 ppb |
2014-07-08 | 1610-901-1120 | 15.1 ppb |
2014-07-08 | 1610-902-0904 | 20.4 ppb |
2014-07-08 | 1610-903-0950 | 14.7 ppb |
2014-07-08 | 1610-904-0843 | 23.2 ppb |
2014-07-08 | 1610-905-0925 | 17.5 ppb |
2014-07-08 | 1610-906-1059 | 14.2 ppb |
2014-07-08 | 1610-907-1015 | 17.7 ppb |
2014-10-14 | 1610-900-0805 | 7.80 ppb |
2014-10-14 | 1610-901-0855 | 7.94 ppb |
2014-10-14 | 1610-902-1102 | 8.06 ppb |
2014-10-14 | 1610-903-0930 | 8.15 ppb |
2014-10-14 | 1610-904-1120 | 8.66 ppb |
2014-10-14 | 1610-905-1040 | 7.60 ppb |
2014-10-14 | 1610-906-1015 | 7.92 ppb |
2014-10-14 | 1610-907-0950 | 8.58 ppb |
2015-01-13 | 1610-900-1105 | 8.64 ppb |
2015-01-13 | 1610-901-1042 | 11.7 ppb |
2015-01-13 | 1610-902-0840 | 9.38 ppb |
2015-01-13 | 1610-903-0946 | 12.2 ppb |
2015-01-13 | 1610-904-0818 | 6.96 ppb |
2015-01-13 | 1610-905-0900 | 11.0 ppb |
2015-01-13 | 1610-906-1016 | 6.32 ppb |
2015-01-13 | 1610-907-0926 | 9.12 ppb |
2015-04-14 | 1610-900-1129 | 15.8 ppb |
2015-04-14 | 1610-901-1050 | 11.9 ppb |
2015-04-14 | 1610-902-0810 | 15.1 ppb |
2015-04-14 | 1610-903-1025 | 8.17 ppb |
2015-04-14 | 1610-904-0845 | 16.7 ppb |
2015-04-14 | 1610-905-0935 | 16.8 ppb |
2015-04-14 | 1610-906-1110 | 16.7 ppb |
2015-04-14 | 1610-907-0956 | 16.4 ppb |
2015-07-14 | 1610-900-1040 | 18.9 ppb |
2015-07-14 | 1610-901-1110 | 20.5 ppb |
2015-07-14 | 1610-902-0835 | 26.9 ppb |
2015-07-14 | 1610-903-0925 | 23.5 ppb |
2015-07-14 | 1610-904-0810 | 30.9 ppb |
2015-07-14 | 1610-905-0855 | 24.3 ppb |
2015-07-14 | 1610-906-1015 | 25.4 ppb |
2015-07-14 | 1610-907-0940 | 23.9 ppb |
2015-10-13 | 1610-900-1020 | 6.76 ppb |
2015-10-13 | 1610-901-0904 | 9.10 ppb |
2015-10-13 | 1610-902-1200 | 7.22 ppb |
2015-10-13 | 1610-903-0944 | 8.74 ppb |
2015-10-13 | 1610-904-1218 | 6.28 ppb |
2015-10-13 | 1610-905-1135 | 8.01 ppb |
2015-10-13 | 1610-906-0830 | 8.05 ppb |
2015-10-13 | 1610-907-1053 | 6.55 ppb |
2016-01-12 | 1610-900-0905 | 34.1 ppb |
2016-01-12 | 1610-901-0840 | 23.9 ppb |
2016-01-12 | 1610-902-1059 | 38.9 ppb |
2016-01-12 | 1610-903-0807 | 25.1 ppb |
2016-01-12 | 1610-904-1122 | 31.9 ppb |
2016-01-12 | 1610-905-1030 | 33.8 ppb |
2016-01-12 | 1610-906-0942 | 28.6 ppb |
2016-01-12 | 1610-907-1010 | 36.6 ppb |
2016-04-12 | 1610-004-1200 | 3.25 ppb |
2016-04-12 | 1610-900-1049 | 3.06 ppb |
2016-04-12 | 1610-901-1026 | 2.54 ppb |
2016-04-12 | 1610-902-1144 | 3.06 ppb |
2016-04-12 | 1610-903-0930 | 2.69 ppb |
2016-04-12 | 1610-905-1124 | 3.15 ppb |
2016-04-12 | 1610-906-0903 | 2.87 ppb |
2016-04-12 | 1610-907-0954 | 3.12 ppb |
2016-07-12 | 1610-900-0820 | 4.67 ppb |
2016-07-12 | 1610-901-0853 | 4.90 ppb |
2016-07-12 | 1610-902-1133 | 3.73 ppb |
2016-07-12 | 1610-903-1015 | 4.77 ppb |
2016-07-12 | 1610-904-1156 | 3.70 ppb |
2016-07-12 | 1610-905-1110 | 3.78 ppb |
2016-07-12 | 1610-906-0921 | 4.18 ppb |
2016-07-12 | 1610-907-1042 | 3.95 ppb |
2016-10-11 | 1610-900-1256 | 10.5 ppb |
2016-10-11 | 1610-901-1236 | 8.68 ppb |
2016-10-11 | 1610-902-1036 | 8.58 ppb |
2016-10-11 | 1610-903-1148 | 9.26 ppb |
2016-10-11 | 1610-904-1007 | 9.18 ppb |
2016-10-11 | 1610-905-1107 | 8.98 ppb |
2016-10-11 | 1610-906-1217 | 9.43 ppb |
2016-10-11 | 1610-907-1126 | 10.9 ppb |
2017-01-10 | 1610-900-0945 | 10.7 ppb |
2017-01-10 | 1610-901-0922 | 12.0 ppb |
2017-01-10 | 1610-902-1040 | 12.6 ppb |
2017-01-10 | 1610-903-0801 | 12.3 ppb |
2017-01-10 | 1610-904-1109 | 8.56 ppb |
2017-01-10 | 1610-905-1013 | 11.2 ppb |
2017-01-10 | 1610-906-0821 | 12.9 ppb |
2017-01-10 | 1610-907-0854 | 7.76 ppb |
2017-04-11 | 1610-900-0825 | 9.36 ppb |
2017-04-11 | 1610-901-0850 | 9.10 ppb |
2017-04-11 | 1610-902-0946 | 8.22 ppb |
2017-04-11 | 1610-903-1125 | 7.98 ppb |
2017-04-11 | 1610-904-1010 | 6.89 ppb |
2017-04-11 | 1610-905-1035 | 9.32 ppb |
2017-04-11 | 1610-906-0915 | 8.22 ppb |
2017-04-11 | 1610-907-1058 | 9.43 ppb |
2017-07-11 | 1610-900-0847 | 4.65 ppb |
2017-07-11 | 1610-901-0933 | 5.07 ppb |
2017-07-11 | 1610-902-1114 | 3.14 ppb |
2017-07-11 | 1610-903-1018 | 5.62 ppb |
2017-07-11 | 1610-904-1126 | ND |
2017-07-11 | 1610-905-1100 | ND |
2017-07-11 | 1610-906-0958 | 5.46 ppb |
2017-07-11 | 1610-907-1044 | 2.43 ppb |
2017-09-12 | 5867-004-0943 | ND |
2017-10-11 | 1610-900-0810 | 1.57 ppb |
2017-10-11 | 1610-901-0839 | 2.17 ppb |
2017-10-11 | 1610-902-1110 | ND |
2017-10-11 | 1610-903-0935 | 2.00 ppb |
2017-10-11 | 1610-904-1131 | ND |
2017-10-11 | 1610-905-1045 | ND |
2017-10-11 | 1610-906-0910 | 1.84 ppb |
2017-10-11 | 1610-907-1005 | ND |
2018-01-09 | 1610-900-1250 | 9.85 ppb |
2018-01-09 | 1610-901-1221 | 6.80 ppb |
2018-01-09 | 1610-902-0842 | 11.0 ppb |
2018-01-09 | 1610-903-1116 | 2.58 ppb |
2018-01-09 | 1610-904-0925 | 6.97 ppb |
2018-01-09 | 1610-905-1000 | 11.0 ppb |
2018-01-09 | 1610-906-1151 | 4.03 ppb |
2018-01-09 | 1610-907-1041 | 15.2 ppb |
2018-04-09 | 1610-900-0856 | 16.4 ppb |
2018-04-09 | 1610-901-0919 | 18.5 ppb |
2018-04-09 | 1610-902-1100 | 15.0 ppb |
2018-04-09 | 1610-903-1001 | 10.7 ppb |
2018-04-09 | 1610-904-1120 | 10.1 ppb |
2018-04-09 | 1610-905-1041 | 16.4 ppb |
2018-04-09 | 1610-906-0941 | 13.1 ppb |
2018-04-09 | 1610-907-1020 | 14.5 ppb |
2018-07-10 | 1610-900-1027 | 10.8 ppb |
2018-07-10 | 1610-901-1008 | 11.0 ppb |
2018-07-10 | 1610-902-0816 | 12.5 ppb |
2018-07-10 | 1610-903-0925 | 10.9 ppb |
2018-07-10 | 1610-904-0800 | 12.3 ppb |
2018-07-10 | 1610-905-0851 | 13.4 ppb |
2018-07-10 | 1610-906-0948 | 9.46 ppb |
2018-07-10 | 1610-907-0906 | 11.2 ppb |
2018-10-09 | 1610-900-1033 | 11.5 ppb |
2018-10-09 | 1610-901-1001 | 11.4 ppb |
2018-10-09 | 1610-902-0816 | 12.0 ppb |
2018-10-09 | 1610-903-0919 | 11.0 ppb |
2018-10-09 | 1610-904-0830 | 11.0 ppb |
2018-10-09 | 1610-905-0850 | 11.0 ppb |
2018-10-09 | 1610-906-0943 | 8.79 ppb |
2018-10-09 | 1610-907-0905 | 11.5 ppb |
2019-01-08 | 1610-900-0837 | 20.0 ppb |
2019-01-08 | 1610-901-0900 | 20.8 ppb |
2019-01-08 | 1610-902-0940 | 22.2 ppb |
2019-01-08 | 1610-903-1058 | 20.7 ppb |
2019-01-08 | 1610-904-1002 | 22.8 ppb |
2019-01-08 | 1610-905-1142 | 23.5 ppb |
2019-01-08 | 1610-906-1029 | 21.0 ppb |
2019-01-08 | 1610-907-1118 | 21.9 ppb |
2019-04-09 | 1610-900-1102 | 12.3 ppb |
2019-04-09 | 1610-901-0816 | 5.29 ppb |
2019-04-09 | 1610-902-1018 | 12.8 ppb |
2019-04-09 | 1610-903-0921 | 5.79 ppb |
2019-04-09 | 1610-904-1038 | 10.9 ppb |
2019-04-09 | 1610-905-0959 | 10.0 ppb |
2019-04-09 | 1610-906-0841 | 3.92 ppb |
2019-04-09 | 1610-907-0940 | 15.6 ppb |
2019-07-09 | 1610-900-0800 | 10.3 ppb |
2019-07-09 | 1610-901-0825 | 9.07 ppb |
2019-07-09 | 1610-902-1025 | 10.7 ppb |
2019-07-09 | 1610-903-0920 | 11.1 ppb |
2019-07-09 | 1610-904-1041 | 10.6 ppb |
2019-07-09 | 1610-905-1006 | 10.5 ppb |
2019-07-09 | 1610-906-0855 | 10.7 ppb |
2019-07-09 | 1610-907-0942 | 11.6 ppb |
2019-10-08 | 1610-900-0749 | 3.17 ppb |
2019-10-08 | 1610-901-0819 | 2.91 ppb |
2019-10-08 | 1610-902-1027 | 2.41 ppb |
2019-10-08 | 1610-903-0920 | 3.53 ppb |
2019-10-08 | 1610-904-1045 | ND |
2019-10-08 | 1610-905-0958 | ND |
2019-10-08 | 1610-906-0859 | 2.50 ppb |
2019-10-08 | 1610-907-0939 | 1.64 ppb |