Bromoform
San Jose Water Company
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.
331
Samples
0
Samples exceeding legal limit (MCL)
235
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 11.9 ppb | 61 | 57 | ND - 37.2 ppb |
| 2015 | 7.48 ppb | 31 | 22 | ND - 22.0 ppb |
| 2016 | 6.13 ppb | 49 | 38 | ND - 15.9 ppb |
| 2017 | 3.58 ppb | 62 | 42 | ND - 16.2 ppb |
| 2018 | 4.03 ppb | 64 | 42 | ND - 16.6 ppb |
| 2019 | 3.70 ppb | 64 | 34 | ND - 18.8 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 |
|---|---|---|
| 2014-02-28 | 1610-900-0957 | 37.2 ppb |
| 2014-02-28 | 1610-901-1241 | 24.4 ppb |
| 2014-02-28 | 1610-902-0900 | 34.7 ppb |
| 2014-02-28 | 1610-903-0926 | 36.2 ppb |
| 2014-02-28 | 1610-904-0910 | 36.1 ppb |
| 2014-02-28 | 1610-905-1212 | 24.2 ppb |
| 2014-02-28 | 1610-906-1021 | 34.9 ppb |
| 2014-02-28 | 1610-907-1225 | 21.0 ppb |
| 2014-02-28 | 1610-908-0941 | 21.4 ppb |
| 2014-02-28 | 1610-909-1009 | 23.9 ppb |
| 2014-02-28 | 1610-910-1032 | 18.6 ppb |
| 2014-02-28 | 1610-911-1054 | 20.3 ppb |
| 2014-02-28 | 1610-912-1414 | 29.6 ppb |
| 2014-02-28 | 1610-913-1351 | 30.0 ppb |
| 2014-02-28 | 1610-914-1320 | 31.1 ppb |
| 2014-02-28 | 1610-915-1110 | 4.97 ppb |
| 2014-05-07 | 1610-900-0925 | 1.62 ppb |
| 2014-05-07 | 1610-901-1007 | 1.98 ppb |
| 2014-05-07 | 1610-902-0753 | 8.20 ppb |
| 2014-05-07 | 1610-903-0913 | 8.50 ppb |
| 2014-05-07 | 1610-904-0807 | 8.56 ppb |
| 2014-05-07 | 1610-905-0933 | 0.550 ppb |
| 2014-05-07 | 1610-906-1035 | 0.790 ppb |
| 2014-05-07 | 1610-907-0943 | 1.12 ppb |
| 2014-05-07 | 1610-908-0900 | 7.60 ppb |
| 2014-05-07 | 1610-909-1025 | 1.33 ppb |
| 2014-05-07 | 1610-910-1055 | 15.3 ppb |
| 2014-05-07 | 1610-911-1116 | 18.0 ppb |
| 2014-05-07 | 1610-912-1323 | 5.13 ppb |
| 2014-05-07 | 1610-913-1430 | 6.56 ppb |
| 2014-05-07 | 1610-914-1420 | 7.43 ppb |
| 2014-05-07 | 1610-915-1235 | 0.850 ppb |
| 2014-08-25 | 1610-901-1138 | ND |
| 2014-08-25 | 1610-902-0933 | 8.85 ppb |
| 2014-08-25 | 1610-904-0947 | 8.56 ppb |
| 2014-08-25 | 1610-905-1108 | ND |
| 2014-08-25 | 1610-907-1123 | ND |
| 2014-08-25 | 1610-908-1025 | 18.7 ppb |
| 2014-08-25 | 1610-909-1155 | ND |
| 2014-08-25 | 1610-910-1217 | 12.4 ppb |
| 2014-08-25 | 1610-911-1333 | 6.25 ppb |
| 2014-08-25 | 1610-912-1417 | 13.5 ppb |
| 2014-08-25 | 1610-913-1449 | 11.2 ppb |
| 2014-08-25 | 1610-914-1438 | 12.6 ppb |
| 2014-08-25 | 1610-915-1350 | 3.83 ppb |
| 2014-11-07 | 1610-900-1015 | 5.59 ppb |
| 2014-11-07 | 1610-901-1055 | 6.26 ppb |
| 2014-11-07 | 1610-902-0909 | 9.51 ppb |
| 2014-11-07 | 1610-903-1004 | 5.37 ppb |
| 2014-11-07 | 1610-904-0920 | 9.03 ppb |
| 2014-11-07 | 1610-905-1024 | 6.90 ppb |
| 2014-11-07 | 1610-906-1222 | 5.50 ppb |
| 2014-11-07 | 1610-907-1040 | 6.23 ppb |
| 2014-11-07 | 1610-908-0948 | 5.97 ppb |
| 2014-11-07 | 1610-909-1103 | 4.63 ppb |
| 2014-11-07 | 1610-910-1243 | 8.56 ppb |
| 2014-11-07 | 1610-911-1303 | 7.81 ppb |
| 2014-11-07 | 1610-912-1353 | 7.71 ppb |
| 2014-11-07 | 1610-913-1427 | 9.69 ppb |
| 2014-11-07 | 1610-914-1411 | 8.34 ppb |
| 2014-11-07 | 1610-915-1334 | 2.91 ppb |
| 2015-02-06 | 1610-900-1014 | 1.69 ppb |
| 2015-02-06 | 1610-901-0958 | ND |
| 2015-02-06 | 1610-902-1306 | 3.29 ppb |
| 2015-02-06 | 1610-903-1228 | 1.70 ppb |
| 2015-02-06 | 1610-904-1259 | 2.02 ppb |
| 2015-02-06 | 1610-905-0923 | ND |
| 2015-02-06 | 1610-906-0858 | ND |
| 2015-02-06 | 1610-907-0948 | ND |
| 2015-02-06 | 1610-908-1024 | 13.9 ppb |
| 2015-02-06 | 1610-909-0913 | ND |
| 2015-02-06 | 1610-910-1041 | 15.5 ppb |
| 2015-02-06 | 1610-911-1154 | 14.7 ppb |
| 2015-02-06 | 1610-912-1339 | 17.4 ppb |
| 2015-02-06 | 1610-913-1418 | 7.07 ppb |
| 2015-02-06 | 1610-914-1400 | 5.77 ppb |
| 2015-02-06 | 1610-915-1051 | 5.82 ppb |
| 2015-05-29 | 1610-900-1115 | 4.62 ppb |
| 2015-05-29 | 1610-901-1339 | ND |
| 2015-05-29 | 1610-902-1000 | 21.7 ppb |
| 2015-05-29 | 1610-903-1105 | 3.84 ppb |
| 2015-05-29 | 1610-904-1016 | 21.8 ppb |
| 2015-05-29 | 1610-905-1310 | ND |
| 2015-05-29 | 1610-906-1240 | 3.18 ppb |
| 2015-05-29 | 1610-907-1322 | ND |
| 2015-05-29 | 1610-908-1050 | 16.3 ppb |
| 2015-05-29 | 1610-909-1250 | ND |
| 2015-05-29 | 1610-910-1227 | 10.6 ppb |
| 2015-05-29 | 1610-911-1403 | 10.6 ppb |
| 2015-05-29 | 1610-912-1435 | 20.4 ppb |
| 2015-05-29 | 1610-914-1453 | 22.0 ppb |
| 2015-05-29 | 1610-915-1216 | 8.04 ppb |
| 2016-03-04 | 1610-005-1315 | ND |
| 2016-04-01 | 1610-005-1140 | ND |
| 2016-05-06 | 1610-900-0907 | ND |
| 2016-05-06 | 1610-901-1027 | ND |
| 2016-05-06 | 1610-902-0800 | 5.79 ppb |
| 2016-05-06 | 1610-903-0852 | ND |
| 2016-05-06 | 1610-904-0812 | 5.75 ppb |
| 2016-05-06 | 1610-905-0945 | ND |
| 2016-05-06 | 1610-906-1045 | ND |
| 2016-05-06 | 1610-907-1000 | ND |
| 2016-05-06 | 1610-908-0835 | 3.68 ppb |
| 2016-05-06 | 1610-909-0925 | ND |
| 2016-05-06 | 1610-910-1110 | 9.40 ppb |
| 2016-05-06 | 1610-911-1145 | 7.78 ppb |
| 2016-05-06 | 1610-912-1320 | 9.49 ppb |
| 2016-05-06 | 1610-913-1415 | 4.25 ppb |
| 2016-05-06 | 1610-914-1350 | 4.34 ppb |
| 2016-05-06 | 1610-915-1255 | 4.60 ppb |
| 2016-08-19 | 1610-900-1151 | 4.53 ppb |
| 2016-08-19 | 1610-902-1026 | 5.92 ppb |
| 2016-08-19 | 1610-903-1142 | 4.58 ppb |
| 2016-08-19 | 1610-904-1110 | 4.68 ppb |
| 2016-08-19 | 1610-905-1313 | 6.24 ppb |
| 2016-08-19 | 1610-906-1350 | 4.50 ppb |
| 2016-08-19 | 1610-907-1330 | 5.94 ppb |
| 2016-08-19 | 1610-908-1130 | 4.98 ppb |
| 2016-08-19 | 1610-909-1343 | 4.28 ppb |
| 2016-08-19 | 1610-910-1410 | 5.41 ppb |
| 2016-08-19 | 1610-911-0829 | 5.61 ppb |
| 2016-08-19 | 1610-912-0915 | 5.83 ppb |
| 2016-08-19 | 1610-913-0946 | ND |
| 2016-08-19 | 1610-914-0938 | 5.40 ppb |
| 2016-08-19 | 1610-915-0855 | ND |
| 2016-11-01 | 1610-900-1041 | 9.67 ppb |
| 2016-11-01 | 1610-901-1145 | 12.1 ppb |
| 2016-11-01 | 1610-902-0943 | 9.20 ppb |
| 2016-11-01 | 1610-903-1032 | 9.67 ppb |
| 2016-11-01 | 1610-904-0954 | 7.94 ppb |
| 2016-11-01 | 1610-905-1117 | 12.8 ppb |
| 2016-11-01 | 1610-906-1050 | 7.16 ppb |
| 2016-11-01 | 1610-907-1130 | 7.90 ppb |
| 2016-11-01 | 1610-908-1013 | 10.4 ppb |
| 2016-11-01 | 1610-909-1103 | 15.8 ppb |
| 2016-11-01 | 1610-910-1231 | 8.30 ppb |
| 2016-11-01 | 1610-911-1207 | 9.82 ppb |
| 2016-11-01 | 1610-912-1432 | 12.6 ppb |
| 2016-11-01 | 1610-913-1357 | 12.8 ppb |
| 2016-11-01 | 1610-914-1412 | 15.6 ppb |
| 2016-11-01 | 1610-915-1245 | 15.9 ppb |
| 2017-02-10 | 1610-900-0836 | 6.40 ppb |
| 2017-02-10 | 1610-901-0915 | 5.30 ppb |
| 2017-02-10 | 1610-902-0743 | 8.11 ppb |
| 2017-02-10 | 1610-903-0826 | 7.05 ppb |
| 2017-02-10 | 1610-904-0750 | 7.48 ppb |
| 2017-02-10 | 1610-905-0850 | 4.48 ppb |
| 2017-02-10 | 1610-906-0943 | 7.71 ppb |
| 2017-02-10 | 1610-907-0902 | 4.72 ppb |
| 2017-02-10 | 1610-908-0811 | 5.41 ppb |
| 2017-02-10 | 1610-909-0933 | 5.04 ppb |
| 2017-02-10 | 1610-910-1000 | 8.73 ppb |
| 2017-02-10 | 1610-911-1046 | 16.2 ppb |
| 2017-02-10 | 1610-912-1230 | 12.5 ppb |
| 2017-02-10 | 1610-913-1300 | 12.7 ppb |
| 2017-02-10 | 1610-914-1300 | 11.4 ppb |
| 2017-02-10 | 1610-915-1011 | 1.94 ppb |
| 2017-05-15 | 1610-900-1016 | ND |
| 2017-05-15 | 1610-901-1345 | 3.42 ppb |
| 2017-05-15 | 1610-902-0903 | ND |
| 2017-05-15 | 1610-903-1007 | ND |
| 2017-05-15 | 1610-904-0915 | ND |
| 2017-05-15 | 1610-905-1317 | 3.41 ppb |
| 2017-05-15 | 1610-906-1032 | ND |
| 2017-05-15 | 1610-907-1329 | 4.23 ppb |
| 2017-05-15 | 1610-908-0938 | ND |
| 2017-05-15 | 1610-909-1023 | 3.74 ppb |
| 2017-05-15 | 1610-910-1115 | ND |
| 2017-05-15 | 1610-911-1252 | ND |
| 2017-05-15 | 1610-912-1414 | ND |
| 2017-05-15 | 1610-913-1445 | 4.95 ppb |
| 2017-05-15 | 1610-914-1435 | ND |
| 2017-05-15 | 1610-915-1028 | 6.71 ppb |
| 2017-08-14 | 1610-900-1011 | 2.50 ppb |
| 2017-08-14 | 1610-902-0919 | 2.52 ppb |
| 2017-08-14 | 1610-903-1000 | 2.14 ppb |
| 2017-08-14 | 1610-904-0930 | 2.52 ppb |
| 2017-08-14 | 1610-905-1050 | 4.67 ppb |
| 2017-08-14 | 1610-906-1023 | 2.23 ppb |
| 2017-08-14 | 1610-907-1111 | 5.40 ppb |
| 2017-08-14 | 1610-908-0948 | 1.73 ppb |
| 2017-08-14 | 1610-909-1300 | 2.32 ppb |
| 2017-08-14 | 1610-911-1235 | 6.98 ppb |
| 2017-08-14 | 1610-912-1318 | 6.75 ppb |
| 2017-08-14 | 1610-913-1407 | 1.53 ppb |
| 2017-08-14 | 1610-914-1343 | 0.680 ppb |
| 2017-08-14 | 1610-915-1255 | 2.18 ppb |
| 2017-11-01 | 1610-900-1009 | ND |
| 2017-11-01 | 1610-901-1125 | 4.83 ppb |
| 2017-11-01 | 1610-902-0915 | ND |
| 2017-11-01 | 1610-903-1002 | ND |
| 2017-11-01 | 1610-904-0900 | ND |
| 2017-11-01 | 1610-905-1043 | 4.89 ppb |
| 2017-11-01 | 1610-906-1032 | ND |
| 2017-11-01 | 1610-907-1051 | 6.95 ppb |
| 2017-11-01 | 1610-908-0950 | ND |
| 2017-11-01 | 1610-909-1023 | 3.94 ppb |
| 2017-11-01 | 1610-910-1201 | ND |
| 2017-11-01 | 1610-911-1255 | 4.23 ppb |
| 2017-11-01 | 1610-912-1337 | ND |
| 2017-11-01 | 1610-913-1410 | ND |
| 2017-11-01 | 1610-914-1400 | ND |
| 2017-11-01 | 1610-915-1317 | 1.31 ppb |
| 2018-02-12 | 1610-900-1058 | 4.78 ppb |
| 2018-02-12 | 1610-901-1243 | ND |
| 2018-02-12 | 1610-902-0931 | 2.62 ppb |
| 2018-02-12 | 1610-903-1050 | 4.07 ppb |
| 2018-02-12 | 1610-904-0940 | 3.29 ppb |
| 2018-02-12 | 1610-905-1213 | ND |
| 2018-02-12 | 1610-906-1119 | 3.45 ppb |
| 2018-02-12 | 1610-907-1227 | ND |
| 2018-02-12 | 1610-908-1011 | 4.31 ppb |
| 2018-02-12 | 1610-909-1146 | ND |
| 2018-02-12 | 1610-910-1302 | 2.08 ppb |
| 2018-02-12 | 1610-911-1337 | 11.8 ppb |
| 2018-02-12 | 1610-912-1416 | 6.26 ppb |
| 2018-02-12 | 1610-913-1449 | 11.7 ppb |
| 2018-02-12 | 1610-914-1441 | 4.48 ppb |
| 2018-02-12 | 1610-915-1315 | 1.15 ppb |
| 2018-05-07 | 1610-900-1022 | ND |
| 2018-05-07 | 1610-901-1150 | ND |
| 2018-05-07 | 1610-902-0918 | 2.88 ppb |
| 2018-05-07 | 1610-903-1014 | ND |
| 2018-05-07 | 1610-904-0929 | 6.76 ppb |
| 2018-05-07 | 1610-905-1121 | ND |
| 2018-05-07 | 1610-906-1045 | ND |
| 2018-05-07 | 1610-907-1130 | ND |
| 2018-05-07 | 1610-908-0955 | 1.96 ppb |
| 2018-05-07 | 1610-909-1036 | ND |
| 2018-05-07 | 1610-910-1207 | 5.83 ppb |
| 2018-05-07 | 1610-911-1314 | 14.7 ppb |
| 2018-05-07 | 1610-913-1348 | 4.23 ppb |
| 2018-05-07 | 1610-914-1405 | 1.81 ppb |
| 2018-05-07 | 1610-915-1217 | 3.72 ppb |
| 2018-05-08 | 1610-912-1254 | 12.4 ppb |
| 2018-08-02 | 1610-900-1004 | ND |
| 2018-08-02 | 1610-901-1105 | ND |
| 2018-08-02 | 1610-902-0910 | 3.80 ppb |
| 2018-08-02 | 1610-903-0954 | 2.70 ppb |
| 2018-08-02 | 1610-904-0920 | 3.85 ppb |
| 2018-08-02 | 1610-905-1046 | ND |
| 2018-08-02 | 1610-906-1038 | ND |
| 2018-08-02 | 1610-907-1055 | ND |
| 2018-08-02 | 1610-908-0941 | 3.82 ppb |
| 2018-08-02 | 1610-909-1021 | ND |
| 2018-08-02 | 1610-910-1139 | 3.49 ppb |
| 2018-08-02 | 1610-911-1300 | 11.1 ppb |
| 2018-08-02 | 1610-912-1331 | 7.86 ppb |
| 2018-08-02 | 1610-913-1410 | 2.27 ppb |
| 2018-08-02 | 1610-914-1400 | 1.98 ppb |
| 2018-08-02 | 1610-915-1236 | ND |
| 2018-11-05 | 1610-900-1055 | 1.97 ppb |
| 2018-11-05 | 1610-901-1230 | ND |
| 2018-11-05 | 1610-902-0935 | 9.44 ppb |
| 2018-11-05 | 1610-903-1045 | 2.48 ppb |
| 2018-11-05 | 1610-904-0947 | 10.3 ppb |
| 2018-11-05 | 1610-905-1156 | ND |
| 2018-11-05 | 1610-906-1119 | 1.06 ppb |
| 2018-11-05 | 1610-907-1204 | ND |
| 2018-11-05 | 1610-908-1011 | 10.3 ppb |
| 2018-11-05 | 1610-909-1109 | ND |
| 2018-11-05 | 1610-910-1358 | 8.33 ppb |
| 2018-11-05 | 1610-911-1418 | 16.3 ppb |
| 2018-11-05 | 1610-915-1342 | 7.28 ppb |
| 2018-11-06 | 1610-912-1138 | 16.6 ppb |
| 2018-11-06 | 1610-913-1430 | 12.3 ppb |
| 2018-11-06 | 1610-914-1415 | 6.28 ppb |
| 2019-02-11 | 1610-900-1107 | ND |
| 2019-02-11 | 1610-901-1219 | ND |
| 2019-02-11 | 1610-902-0842 | 3.25 ppb |
| 2019-02-11 | 1610-903-1055 | ND |
| 2019-02-11 | 1610-904-0902 | 2.21 ppb |
| 2019-02-11 | 1610-905-1139 | ND |
| 2019-02-11 | 1610-906-1339 | ND |
| 2019-02-11 | 1610-907-1200 | ND |
| 2019-02-11 | 1610-908-1007 | 9.00 ppb |
| 2019-02-11 | 1610-909-1237 | ND |
| 2019-02-11 | 1610-910-1401 | ND |
| 2019-02-11 | 1610-915-1424 | ND |
| 2019-02-12 | 1610-911-0955 | 11.7 ppb |
| 2019-02-12 | 1610-912-1119 | 5.42 ppb |
| 2019-02-12 | 1610-913-1335 | 18.8 ppb |
| 2019-02-12 | 1610-914-1320 | 7.69 ppb |
| 2019-05-08 | 1610-900-1030 | ND |
| 2019-05-08 | 1610-901-1145 | ND |
| 2019-05-08 | 1610-902-0915 | 7.31 ppb |
| 2019-05-08 | 1610-903-1020 | ND |
| 2019-05-08 | 1610-904-0931 | 6.91 ppb |
| 2019-05-08 | 1610-905-1120 | ND |
| 2019-05-08 | 1610-906-1100 | ND |
| 2019-05-08 | 1610-907-1135 | ND |
| 2019-05-08 | 1610-908-0951 | ND |
| 2019-05-08 | 1610-909-1045 | ND |
| 2019-05-08 | 1610-910-1235 | 2.65 ppb |
| 2019-05-08 | 1610-911-1215 | 14.3 ppb |
| 2019-05-08 | 1610-912-1310 | 15.3 ppb |
| 2019-05-08 | 1610-913-1415 | ND |
| 2019-05-08 | 1610-914-1345 | ND |
| 2019-05-08 | 1610-915-1247 | 8.65 ppb |
| 2019-08-14 | 1610-900-0709 | ND |
| 2019-08-14 | 1610-901-0812 | ND |
| 2019-08-14 | 1610-902-0600 | 9.75 ppb |
| 2019-08-14 | 1610-903-0700 | ND |
| 2019-08-14 | 1610-904-1046 | 10.2 ppb |
| 2019-08-14 | 1610-905-0752 | ND |
| 2019-08-14 | 1610-906-0743 | ND |
| 2019-08-14 | 1610-907-0800 | ND |
| 2019-08-14 | 1610-908-0639 | 7.94 ppb |
| 2019-08-14 | 1610-909-0724 | ND |
| 2019-08-14 | 1610-910-0836 | 2.53 ppb |
| 2019-08-14 | 1610-911-0907 | 15.7 ppb |
| 2019-08-14 | 1610-912-1028 | 16.5 ppb |
| 2019-08-14 | 1610-913-1123 | 1.17 ppb |
| 2019-08-14 | 1610-914-1100 | 1.10 ppb |
| 2019-08-14 | 1610-915-0848 | 5.87 ppb |
| 2019-11-20 | 1610-900-1130 | 2.23 ppb |
| 2019-11-20 | 1610-901-1028 | ND |
| 2019-11-20 | 1610-902-1011 | 6.46 ppb |
| 2019-11-20 | 1610-903-1120 | 2.68 ppb |
| 2019-11-20 | 1610-904-0922 | 3.09 ppb |
| 2019-11-20 | 1610-905-0953 | ND |
| 2019-11-20 | 1610-906-1059 | 1.14 ppb |
| 2019-11-20 | 1610-907-1008 | ND |
| 2019-11-20 | 1610-908-0929 | 4.97 ppb |
| 2019-11-20 | 1610-909-1047 | ND |
| 2019-11-20 | 1610-910-1121 | 3.66 ppb |
| 2019-11-20 | 1610-911-1150 | 16.4 ppb |
| 2019-11-20 | 1610-912-1408 | 4.28 ppb |
| 2019-11-20 | 1610-913-1420 | 4.01 ppb |
| 2019-11-20 | 1610-914-1400 | 1.48 ppb |
| 2019-11-20 | 1610-915-1311 | 2.44 ppb |