Bromoform
California Water Service (CWS) - Los Altos Suburban
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 | 6.01 ppb | 48 | 28 | ND - 19.4 ppb |
2015 | 5.94 ppb | 47 | 30 | ND - 20.0 ppb |
2016 | 5.63 ppb | 39 | 31 | ND - 15.7 ppb |
2017 | 2.44 ppb | 43 | 24 | ND - 14.0 ppb |
2018 | 2.20 ppb | 46 | 29 | ND - 6.36 ppb |
2019 | 2.85 ppb | 47 | 27 | ND - 11.7 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 |
---|---|---|
2014-02-05 | 5701-024-1427 | ND |
2014-02-13 | 5701-900-1205 | 7.91 ppb |
2014-02-13 | 5701-901-1322 | ND |
2014-02-13 | 5701-902-1108 | 10.3 ppb |
2014-02-13 | 5701-903-1344 | 13.9 ppb |
2014-02-13 | 5701-904-1306 | 6.28 ppb |
2014-02-13 | 5701-905-1241 | 10.1 ppb |
2014-02-13 | 5701-906-1150 | 3.56 ppb |
2014-02-13 | 5701-907-1132 | 5.22 ppb |
2014-02-26 | 5701-002-1423 | ND |
2014-02-26 | 5701-010-1456 | ND |
2014-02-26 | 5701-018-1055 | ND |
2014-03-25 | 5701-011-1305 | ND |
2014-03-25 | 5701-028-1530 | ND |
2014-03-25 | 5701-030-1555 | ND |
2014-04-08 | 1610-903-0850 | ND |
2014-04-22 | 5701-020-1340 | ND |
2014-04-22 | 5701-021-1140 | ND |
2014-04-22 | 5701-022-1238 | ND |
2014-05-15 | 5701-900-1334 | 7.65 ppb |
2014-05-15 | 5701-901-1433 | ND |
2014-05-15 | 5701-902-1229 | 8.79 ppb |
2014-05-15 | 5701-903-1457 | 13.4 ppb |
2014-05-15 | 5701-904-1406 | 6.31 ppb |
2014-05-15 | 5701-905-1348 | 7.38 ppb |
2014-05-15 | 5701-906-1308 | 7.71 ppb |
2014-05-15 | 5701-907-1246 | 9.05 ppb |
2014-06-24 | 5701-028-0945 | ND |
2014-07-22 | 5701-024-0923 | ND |
2014-08-07 | 5701-900-1230 | 16.2 ppb |
2014-08-07 | 5701-901-1337 | ND |
2014-08-07 | 5701-902-1143 | 15.7 ppb |
2014-08-07 | 5701-903-1405 | 19.4 ppb |
2014-08-07 | 5701-904-1431 | 16.3 ppb |
2014-08-07 | 5701-905-1248 | 16.9 ppb |
2014-08-07 | 5701-906-1206 | 19.3 ppb |
2014-08-07 | 5701-907-1113 | 14.6 ppb |
2014-09-24 | 5701-028-1050 | ND |
2014-10-21 | 5701-024-1545 | ND |
2014-11-12 | 5701-900-1313 | 3.17 ppb |
2014-11-12 | 5701-901-1433 | ND |
2014-11-12 | 5701-902-1040 | 7.81 ppb |
2014-11-12 | 5701-903-1355 | 17.2 ppb |
2014-11-12 | 5701-904-1330 | 0.810 ppb |
2014-11-12 | 5701-905-1250 | 7.02 ppb |
2014-11-12 | 5701-906-1218 | 6.33 ppb |
2014-11-12 | 5701-907-1142 | 10.2 ppb |
2014-12-16 | 5701-028-1230 | ND |
2015-01-21 | 5701-024-0905 | ND |
2015-02-09 | 5701-900-0802 | 4.01 ppb |
2015-02-09 | 5701-901-0802 | ND |
2015-02-09 | 5701-902-0802 | 1.91 ppb |
2015-02-09 | 5701-903-0802 | 4.79 ppb |
2015-02-09 | 5701-904-0802 | 4.88 ppb |
2015-02-09 | 5701-905-0802 | 2.25 ppb |
2015-02-09 | 5701-906-0802 | 4.84 ppb |
2015-02-09 | 5701-907-0802 | 4.24 ppb |
2015-02-18 | 5701-002-1340 | ND |
2015-02-18 | 5701-013-1145 | ND |
2015-02-18 | 5701-016-0950 | ND |
2015-02-18 | 5701-018-1315 | ND |
2015-03-18 | 5701-028-1100 | ND |
2015-04-21 | 5701-024-1025 | ND |
2015-05-14 | 5701-900-0847 | 6.56 ppb |
2015-05-14 | 5701-901-0847 | 7.72 ppb |
2015-05-14 | 5701-902-0847 | 6.99 ppb |
2015-05-14 | 5701-903-0847 | 6.76 ppb |
2015-05-14 | 5701-904-0847 | 7.25 ppb |
2015-05-14 | 5701-905-0847 | 7.06 ppb |
2015-05-14 | 5701-906-0847 | 7.20 ppb |
2015-05-14 | 5701-907-0847 | 5.76 ppb |
2015-06-16 | 5701-028-1117 | ND |
2015-07-20 | 5701-024-1145 | ND |
2015-07-20 | 5701-029-1125 | ND |
2015-08-11 | 5701-900-0938 | 13.9 ppb |
2015-08-11 | 5701-901-0938 | 10.7 ppb |
2015-08-11 | 5701-902-0938 | 11.6 ppb |
2015-08-11 | 5701-903-0938 | 14.7 ppb |
2015-08-11 | 5701-904-0938 | 19.5 ppb |
2015-08-11 | 5701-905-0938 | 12.0 ppb |
2015-08-11 | 5701-906-0938 | 14.4 ppb |
2015-08-11 | 5701-907-0938 | 20.0 ppb |
2015-08-24 | 5701-023-1130 | ND |
2015-09-22 | 5701-028-1100 | ND |
2015-09-22 | 5701-057-1130 | ND |
2015-11-09 | 5810-900-1232 | 8.00 ppb |
2015-11-09 | 5810-901-1053 | ND |
2015-11-09 | 5810-902-1132 | 3.60 ppb |
2015-11-09 | 5810-903-1035 | 20.0 ppb |
2015-11-09 | 5810-904-1114 | 16.0 ppb |
2015-11-09 | 5810-905-1435 | 8.60 ppb |
2015-11-09 | 5810-906-1321 | 13.0 ppb |
2015-11-09 | 5810-907-1256 | 11.0 ppb |
2015-12-10 | 5701-008-1525 | ND |
2015-12-17 | 5701-028-1115 | ND |
2016-02-09 | 5701-900-0913 | 3.70 ppb |
2016-02-09 | 5701-901-0913 | ND |
2016-02-09 | 5701-902-0913 | 2.92 ppb |
2016-02-09 | 5701-903-0913 | 6.68 ppb |
2016-02-09 | 5701-904-0913 | 5.75 ppb |
2016-02-09 | 5701-905-0913 | 2.87 ppb |
2016-02-09 | 5701-906-0913 | 9.74 ppb |
2016-02-09 | 5701-907-0913 | 3.72 ppb |
2016-03-21 | 5701-028-0952 | ND |
2016-05-10 | 5810-901-1307 | 10.00 ppb |
2016-05-10 | 5810-902-1147 | 11.0 ppb |
2016-05-10 | 5810-906-1207 | 12.0 ppb |
2016-05-10 | 5810-907-1232 | 11.0 ppb |
2016-05-11 | 5810-900-1215 | 9.60 ppb |
2016-05-11 | 5810-903-1150 | 11.0 ppb |
2016-05-11 | 5810-904-1127 | 10.00 ppb |
2016-05-11 | 5810-905-1247 | 6.60 ppb |
2016-06-01 | 5701-028-1014 | ND |
2016-07-26 | 5701-037-1320 | ND |
2016-08-09 | 5701-900-0931 | 4.39 ppb |
2016-08-09 | 5701-901-0931 | 4.67 ppb |
2016-08-09 | 5701-902-0931 | 4.51 ppb |
2016-08-09 | 5701-903-0931 | 4.83 ppb |
2016-08-09 | 5701-904-0931 | 4.04 ppb |
2016-08-09 | 5701-905-0931 | 4.11 ppb |
2016-08-09 | 5701-906-0931 | 4.32 ppb |
2016-08-09 | 5701-907-0931 | 4.74 ppb |
2016-09-21 | 5701-028-1046 | ND |
2016-09-21 | 5701-032-1146 | 15.7 ppb |
2016-09-21 | 5701-035-1130 | ND |
2016-11-15 | 5701-900-0851 | 6.27 ppb |
2016-11-15 | 5701-901-0851 | ND |
2016-11-15 | 5701-902-0851 | 6.94 ppb |
2016-11-15 | 5701-903-0851 | 12.3 ppb |
2016-11-15 | 5701-904-0851 | 7.05 ppb |
2016-11-15 | 5701-905-0851 | 6.13 ppb |
2016-11-15 | 5701-906-0851 | 7.37 ppb |
2016-11-15 | 5701-907-0851 | 5.52 ppb |
2016-12-13 | 5810-028-1140 | ND |
2017-01-18 | 5701-010-1045 | ND |
2017-01-18 | 5701-011-1123 | ND |
2017-02-14 | 5701-020-1546 | ND |
2017-02-14 | 5701-021-1624 | ND |
2017-02-14 | 5810-900-1320 | 3.20 ppb |
2017-02-14 | 5810-901-1205 | ND |
2017-02-14 | 5701-902-1111 | 4.92 ppb |
2017-02-14 | 5810-903-1240 | 14.0 ppb |
2017-02-14 | 5810-904-1301 | 6.00 ppb |
2017-02-14 | 5810-905-1345 | 1.000 ppb |
2017-02-14 | 5810-906-1535 | 11.0 ppb |
2017-02-14 | 5701-907-1111 | 4.02 ppb |
2017-03-06 | 5701-022-1038 | ND |
2017-03-15 | 5701-028-1234 | ND |
2017-03-15 | 5701-030-1245 | ND |
2017-05-09 | 5701-901-0908 | ND |
2017-05-09 | 5701-902-0908 | ND |
2017-05-09 | 5701-903-0908 | 0.510 ppb |
2017-05-09 | 5701-904-0908 | 0.560 ppb |
2017-05-09 | 5701-905-0908 | 0.660 ppb |
2017-05-09 | 5701-906-0908 | 2.15 ppb |
2017-05-09 | 5701-907-0908 | 0.800 ppb |
2017-05-11 | 5701-900-1531 | 0.850 ppb |
2017-06-26 | 5701-028-1420 | ND |
2017-08-17 | 5810-900-1310 | 7.50 ppb |
2017-08-17 | 5810-901-1135 | ND |
2017-08-17 | 5810-902-1336 | 7.20 ppb |
2017-08-17 | 5810-903-1111 | 6.60 ppb |
2017-08-17 | 5810-904-1202 | 8.60 ppb |
2017-08-17 | 5810-905-1226 | 6.80 ppb |
2017-08-17 | 5810-906-1400 | 3.80 ppb |
2017-08-17 | 5810-907-1247 | 8.30 ppb |
2017-08-23 | 5701-022-1315 | ND |
2017-09-26 | 5701-028-1430 | ND |
2017-11-14 | 5810-900-1328 | 1.40 ppb |
2017-11-14 | 5810-901-1211 | ND |
2017-11-14 | 5810-902-1355 | ND |
2017-11-14 | 5810-903-1150 | ND |
2017-11-14 | 5810-904-1228 | 1.20 ppb |
2017-11-14 | 5810-905-1002 | ND |
2017-11-14 | 5810-906-1412 | 2.00 ppb |
2017-11-14 | 5810-907-1307 | 1.70 ppb |
2017-12-13 | 5701-028-1520 | ND |
2018-02-13 | 5810-901-1131 | ND |
2018-02-13 | 5810-902-1321 | ND |
2018-02-13 | 5810-906-1259 | 4.50 ppb |
2018-02-13 | 5810-907-1425 | 3.50 ppb |
2018-02-14 | 5810-900-1713 | 3.20 ppb |
2018-02-14 | 5810-903-1629 | 5.40 ppb |
2018-02-14 | 5810-904-1646 | 3.00 ppb |
2018-02-14 | 5810-905-1735 | 1.60 ppb |
2018-02-20 | 5701-013-1225 | ND |
2018-02-20 | 5701-018-1215 | ND |
2018-03-21 | 5701-016-1245 | ND |
2018-03-21 | 5701-028-1350 | ND |
2018-05-08 | 5701-023-1310 | ND |
2018-05-15 | 5810-900-1435 | 2.90 ppb |
2018-05-15 | 5701-901-0947 | 1.77 ppb |
2018-05-15 | 5701-902-0947 | 1.91 ppb |
2018-05-15 | 5810-903-1539 | 3.20 ppb |
2018-05-15 | 5810-904-1505 | 4.30 ppb |
2018-05-15 | 5810-905-1351 | 2.60 ppb |
2018-05-15 | 5701-906-0947 | 6.36 ppb |
2018-05-15 | 5701-907-0947 | 2.65 ppb |
2018-06-21 | 5701-024-0930 | ND |
2018-06-21 | 5701-028-1131 | ND |
2018-07-18 | 5701-029-0900 | ND |
2018-08-14 | 5701-900-1016 | 4.28 ppb |
2018-08-14 | 5701-901-1016 | 4.10 ppb |
2018-08-14 | 5701-902-1016 | 3.81 ppb |
2018-08-14 | 5701-903-1016 | 4.66 ppb |
2018-08-14 | 5701-904-1016 | 4.66 ppb |
2018-08-14 | 5701-905-1016 | 4.60 ppb |
2018-08-14 | 5701-906-1016 | 4.31 ppb |
2018-08-14 | 5701-907-1016 | 4.78 ppb |
2018-09-06 | 5701-057-0757 | 1.83 ppb |
2018-09-18 | 5701-057-1305 | ND |
2018-09-24 | 5701-028-1200 | ND |
2018-11-15 | 5701-900-0817 | ND |
2018-11-15 | 5701-901-0817 | ND |
2018-11-15 | 5701-902-0817 | 0.600 ppb |
2018-11-15 | 5701-903-0817 | 5.66 ppb |
2018-11-15 | 5701-904-0817 | 3.28 ppb |
2018-11-15 | 5701-905-0817 | 0.810 ppb |
2018-11-15 | 5701-906-0817 | 5.43 ppb |
2018-11-15 | 5701-907-0817 | 1.42 ppb |
2018-12-12 | 9590-002-1400 | ND |
2018-12-12 | 5810-008-1117 | ND |
2018-12-12 | 5810-028-1535 | ND |
2019-02-12 | 5810-901-1625 | ND |
2019-02-12 | 5810-902-1245 | 2.60 ppb |
2019-02-12 | 5810-906-1335 | 11.0 ppb |
2019-02-12 | 5810-907-1220 | 3.60 ppb |
2019-02-13 | 5810-900-1036 | ND |
2019-02-13 | 5810-903-0952 | 1.50 ppb |
2019-02-13 | 5810-904-1150 | 1.40 ppb |
2019-02-13 | 5810-905-1104 | 2.30 ppb |
2019-02-20 | 5701-002-1245 | ND |
2019-03-19 | 5810-028-1400 | ND |
2019-05-14 | 5701-900-0936 | ND |
2019-05-14 | 5701-901-0936 | 5.22 ppb |
2019-05-14 | 5701-902-0936 | 3.51 ppb |
2019-05-14 | 5701-903-0936 | 7.56 ppb |
2019-05-14 | 5701-904-0936 | 7.79 ppb |
2019-05-14 | 5701-905-0936 | 5.01 ppb |
2019-05-14 | 5701-906-0936 | 7.56 ppb |
2019-05-14 | 5701-907-0936 | 6.04 ppb |
2019-06-18 | 5701-028-1510 | ND |
2019-07-11 | 5701-024-1130 | 0.710 ppb |
2019-07-24 | 5701-024-1800 | 0.970 ppb |
2019-07-29 | 5701-024-1530 | 1.01 ppb |
2019-08-06 | 5701-024-1145 | ND |
2019-08-13 | 5701-024-1125 | 0.820 ppb |
2019-08-13 | 5701-900-1213 | 0.970 ppb |
2019-08-13 | 5701-901-1453 | ND |
2019-08-13 | 5701-902-1225 | 8.91 ppb |
2019-08-13 | 5701-903-1420 | 8.15 ppb |
2019-08-13 | 5701-904-1509 | 9.98 ppb |
2019-08-13 | 5701-905-1135 | 8.22 ppb |
2019-08-13 | 5701-906-1239 | 11.7 ppb |
2019-08-13 | 5701-907-1157 | 11.5 ppb |
2019-08-19 | 5701-024-1325 | 0.830 ppb |
2019-08-20 | 5810-037-1115 | ND |
2019-08-26 | 5810-024-1355 | ND |
2019-09-17 | 5701-028-1520 | ND |
2019-09-17 | 5701-032-1530 | ND |
2019-09-17 | 5701-035-1540 | ND |
2019-11-14 | 5701-900-1352 | ND |
2019-11-14 | 5701-901-1127 | ND |
2019-11-14 | 5701-902-1248 | ND |
2019-11-14 | 5701-903-1104 | 2.22 ppb |
2019-11-14 | 5701-904-1030 | ND |
2019-11-14 | 5701-905-1423 | ND |
2019-11-14 | 5701-906-1233 | 3.08 ppb |
2019-11-14 | 5701-907-1336 | ND |
2019-12-16 | 5701-028-1330 | ND |