Bromodichloromethane
California Water Service (CWS) - Los Altos Suburban
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 | 3.86 ppb | 48 | 29 | ND - 13.6 ppb |
2015 | 6.43 ppb | 47 | 27 | ND - 23.6 ppb |
2016 | 8.95 ppb | 39 | 31 | ND - 20.3 ppb |
2017 | 5.54 ppb | 43 | 28 | ND - 17.0 ppb |
2018 | 6.94 ppb | 46 | 30 | ND - 18.0 ppb |
2019 | 5.58 ppb | 47 | 33 | ND - 21.0 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 |
---|---|---|
2014-02-05 | 5701-024-1427 | ND |
2014-02-13 | 5701-900-1205 | 2.09 ppb |
2014-02-13 | 5701-901-1322 | ND |
2014-02-13 | 5701-902-1108 | 2.05 ppb |
2014-02-13 | 5701-903-1344 | 5.03 ppb |
2014-02-13 | 5701-904-1306 | 3.87 ppb |
2014-02-13 | 5701-905-1241 | 2.65 ppb |
2014-02-13 | 5701-906-1150 | 0.830 ppb |
2014-02-13 | 5701-907-1132 | 1.33 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 | 1.06 ppb |
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 | 7.47 ppb |
2014-05-15 | 5701-901-1433 | ND |
2014-05-15 | 5701-902-1229 | 9.14 ppb |
2014-05-15 | 5701-903-1457 | 13.6 ppb |
2014-05-15 | 5701-904-1406 | 5.83 ppb |
2014-05-15 | 5701-905-1348 | 7.91 ppb |
2014-05-15 | 5701-906-1308 | 8.59 ppb |
2014-05-15 | 5701-907-1246 | 11.3 ppb |
2014-06-24 | 5701-028-0945 | ND |
2014-07-22 | 5701-024-0923 | ND |
2014-08-07 | 5701-900-1230 | 9.82 ppb |
2014-08-07 | 5701-901-1337 | ND |
2014-08-07 | 5701-902-1143 | 9.23 ppb |
2014-08-07 | 5701-903-1405 | 11.3 ppb |
2014-08-07 | 5701-904-1431 | 9.30 ppb |
2014-08-07 | 5701-905-1248 | 10.1 ppb |
2014-08-07 | 5701-906-1206 | 11.3 ppb |
2014-08-07 | 5701-907-1113 | 8.99 ppb |
2014-09-24 | 5701-028-1050 | ND |
2014-10-21 | 5701-024-1545 | ND |
2014-11-12 | 5701-900-1313 | 1.88 ppb |
2014-11-12 | 5701-901-1433 | ND |
2014-11-12 | 5701-902-1040 | 4.37 ppb |
2014-11-12 | 5701-903-1355 | 10.5 ppb |
2014-11-12 | 5701-904-1330 | 0.530 ppb |
2014-11-12 | 5701-905-1250 | 4.09 ppb |
2014-11-12 | 5701-906-1218 | 3.51 ppb |
2014-11-12 | 5701-907-1142 | 7.52 ppb |
2014-12-16 | 5701-028-1230 | ND |
2015-01-21 | 5701-024-0905 | ND |
2015-02-09 | 5701-900-0802 | ND |
2015-02-09 | 5701-901-0802 | ND |
2015-02-09 | 5701-902-0802 | ND |
2015-02-09 | 5701-903-0802 | 2.50 ppb |
2015-02-09 | 5701-904-0802 | 0.570 ppb |
2015-02-09 | 5701-905-0802 | ND |
2015-02-09 | 5701-906-0802 | 0.750 ppb |
2015-02-09 | 5701-907-0802 | 4.04 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 | 20.8 ppb |
2015-05-14 | 5701-901-0847 | 22.4 ppb |
2015-05-14 | 5701-902-0847 | 19.5 ppb |
2015-05-14 | 5701-903-0847 | 21.7 ppb |
2015-05-14 | 5701-904-0847 | 21.1 ppb |
2015-05-14 | 5701-905-0847 | 19.9 ppb |
2015-05-14 | 5701-906-0847 | 23.6 ppb |
2015-05-14 | 5701-907-0847 | 16.1 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 | 12.9 ppb |
2015-08-11 | 5701-901-0938 | 12.0 ppb |
2015-08-11 | 5701-902-0938 | 12.5 ppb |
2015-08-11 | 5701-903-0938 | 13.1 ppb |
2015-08-11 | 5701-904-0938 | 13.4 ppb |
2015-08-11 | 5701-905-0938 | 12.2 ppb |
2015-08-11 | 5701-906-0938 | 13.3 ppb |
2015-08-11 | 5701-907-0938 | 12.8 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 | 2.60 ppb |
2015-11-09 | 5810-901-1053 | ND |
2015-11-09 | 5810-902-1132 | 1.30 ppb |
2015-11-09 | 5810-903-1035 | 6.40 ppb |
2015-11-09 | 5810-904-1114 | 5.30 ppb |
2015-11-09 | 5810-905-1435 | 2.80 ppb |
2015-11-09 | 5810-906-1321 | 5.20 ppb |
2015-11-09 | 5810-907-1256 | 3.50 ppb |
2015-12-10 | 5701-008-1525 | ND |
2015-12-17 | 5701-028-1115 | ND |
2016-02-09 | 5701-900-0913 | 6.37 ppb |
2016-02-09 | 5701-901-0913 | ND |
2016-02-09 | 5701-902-0913 | 4.67 ppb |
2016-02-09 | 5701-903-0913 | 20.3 ppb |
2016-02-09 | 5701-904-0913 | 15.5 ppb |
2016-02-09 | 5701-905-0913 | 4.44 ppb |
2016-02-09 | 5701-906-0913 | 7.15 ppb |
2016-02-09 | 5701-907-0913 | 5.34 ppb |
2016-03-21 | 5701-028-0952 | ND |
2016-05-10 | 5810-901-1307 | 17.0 ppb |
2016-05-10 | 5810-902-1147 | 20.0 ppb |
2016-05-10 | 5810-906-1207 | 17.0 ppb |
2016-05-10 | 5810-907-1232 | 17.0 ppb |
2016-05-11 | 5810-900-1215 | 17.0 ppb |
2016-05-11 | 5810-903-1150 | 19.0 ppb |
2016-05-11 | 5810-904-1127 | 17.0 ppb |
2016-05-11 | 5810-905-1247 | 18.0 ppb |
2016-06-01 | 5701-028-1014 | ND |
2016-07-26 | 5701-037-1320 | ND |
2016-08-09 | 5701-900-0931 | 11.3 ppb |
2016-08-09 | 5701-901-0931 | 11.0 ppb |
2016-08-09 | 5701-902-0931 | 9.79 ppb |
2016-08-09 | 5701-903-0931 | 12.5 ppb |
2016-08-09 | 5701-904-0931 | 12.0 ppb |
2016-08-09 | 5701-905-0931 | 11.8 ppb |
2016-08-09 | 5701-906-0931 | 10.4 ppb |
2016-08-09 | 5701-907-0931 | 10.6 ppb |
2016-09-21 | 5701-028-1046 | ND |
2016-09-21 | 5701-032-1146 | 12.6 ppb |
2016-09-21 | 5701-035-1130 | ND |
2016-11-15 | 5701-900-0851 | 5.17 ppb |
2016-11-15 | 5701-901-0851 | ND |
2016-11-15 | 5701-902-0851 | 5.69 ppb |
2016-11-15 | 5701-903-0851 | 9.29 ppb |
2016-11-15 | 5701-904-0851 | 5.33 ppb |
2016-11-15 | 5701-905-0851 | 5.32 ppb |
2016-11-15 | 5701-906-0851 | 5.78 ppb |
2016-11-15 | 5701-907-0851 | 4.95 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 | 2.60 ppb |
2017-02-14 | 5810-901-1205 | ND |
2017-02-14 | 5701-902-1111 | 4.58 ppb |
2017-02-14 | 5810-903-1240 | 17.0 ppb |
2017-02-14 | 5810-904-1301 | 5.10 ppb |
2017-02-14 | 5810-905-1345 | 1.20 ppb |
2017-02-14 | 5810-906-1535 | 5.70 ppb |
2017-02-14 | 5701-907-1111 | 4.52 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 | 5.39 ppb |
2017-05-09 | 5701-903-0908 | 9.20 ppb |
2017-05-09 | 5701-904-0908 | 8.40 ppb |
2017-05-09 | 5701-905-0908 | 9.88 ppb |
2017-05-09 | 5701-906-0908 | 10.5 ppb |
2017-05-09 | 5701-907-0908 | 9.53 ppb |
2017-05-11 | 5701-900-1531 | 9.77 ppb |
2017-06-26 | 5701-028-1420 | ND |
2017-08-17 | 5810-900-1310 | 15.0 ppb |
2017-08-17 | 5810-901-1135 | ND |
2017-08-17 | 5810-902-1336 | 15.0 ppb |
2017-08-17 | 5810-903-1111 | 14.0 ppb |
2017-08-17 | 5810-904-1202 | 15.0 ppb |
2017-08-17 | 5810-905-1226 | 13.0 ppb |
2017-08-17 | 5810-906-1400 | 10.00 ppb |
2017-08-17 | 5810-907-1247 | 16.0 ppb |
2017-08-23 | 5701-022-1315 | ND |
2017-09-26 | 5701-028-1430 | ND |
2017-11-14 | 5810-900-1328 | 4.30 ppb |
2017-11-14 | 5810-901-1211 | ND |
2017-11-14 | 5810-902-1355 | 7.90 ppb |
2017-11-14 | 5810-903-1150 | 11.0 ppb |
2017-11-14 | 5810-904-1228 | 3.10 ppb |
2017-11-14 | 5810-905-1002 | 3.30 ppb |
2017-11-14 | 5810-906-1412 | 3.60 ppb |
2017-11-14 | 5810-907-1307 | 3.60 ppb |
2017-12-13 | 5701-028-1520 | ND |
2018-02-13 | 5810-901-1131 | ND |
2018-02-13 | 5810-902-1321 | 2.30 ppb |
2018-02-13 | 5810-906-1259 | 4.60 ppb |
2018-02-13 | 5810-907-1425 | 9.40 ppb |
2018-02-14 | 5810-900-1713 | 7.50 ppb |
2018-02-14 | 5810-903-1629 | 17.0 ppb |
2018-02-14 | 5810-904-1646 | 9.80 ppb |
2018-02-14 | 5810-905-1735 | 5.60 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 | 12.0 ppb |
2018-05-15 | 5701-901-0947 | 15.5 ppb |
2018-05-15 | 5701-902-0947 | 11.7 ppb |
2018-05-15 | 5810-903-1539 | 13.0 ppb |
2018-05-15 | 5810-904-1505 | 18.0 ppb |
2018-05-15 | 5810-905-1351 | 13.0 ppb |
2018-05-15 | 5701-906-0947 | 14.7 ppb |
2018-05-15 | 5701-907-0947 | 15.1 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 | 13.6 ppb |
2018-08-14 | 5701-901-1016 | 12.7 ppb |
2018-08-14 | 5701-902-1016 | 12.2 ppb |
2018-08-14 | 5701-903-1016 | 15.6 ppb |
2018-08-14 | 5701-904-1016 | 15.1 ppb |
2018-08-14 | 5701-905-1016 | 14.5 ppb |
2018-08-14 | 5701-906-1016 | 13.5 ppb |
2018-08-14 | 5701-907-1016 | 14.4 ppb |
2018-09-06 | 5701-057-0757 | 0.720 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 | 1.72 ppb |
2018-11-15 | 5701-903-0817 | 15.1 ppb |
2018-11-15 | 5701-904-0817 | 5.91 ppb |
2018-11-15 | 5701-905-0817 | 2.63 ppb |
2018-11-15 | 5701-906-0817 | 9.98 ppb |
2018-11-15 | 5701-907-0817 | 2.26 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 | 17.0 ppb |
2019-02-12 | 5810-906-1335 | 21.0 ppb |
2019-02-12 | 5810-907-1220 | 20.0 ppb |
2019-02-13 | 5810-900-1036 | ND |
2019-02-13 | 5810-903-0952 | 3.70 ppb |
2019-02-13 | 5810-904-1150 | 7.40 ppb |
2019-02-13 | 5810-905-1104 | 15.0 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 | 11.5 ppb |
2019-05-14 | 5701-902-0936 | 5.99 ppb |
2019-05-14 | 5701-903-0936 | 12.9 ppb |
2019-05-14 | 5701-904-0936 | 12.5 ppb |
2019-05-14 | 5701-905-0936 | 8.47 ppb |
2019-05-14 | 5701-906-0936 | 12.4 ppb |
2019-05-14 | 5701-907-0936 | 8.06 ppb |
2019-06-18 | 5701-028-1510 | ND |
2019-07-11 | 5701-024-1130 | 1.18 ppb |
2019-07-24 | 5701-024-1800 | 2.23 ppb |
2019-07-29 | 5701-024-1530 | 2.04 ppb |
2019-08-06 | 5701-024-1145 | 1.15 ppb |
2019-08-13 | 5701-024-1125 | 1.64 ppb |
2019-08-13 | 5701-900-1213 | 2.40 ppb |
2019-08-13 | 5701-901-1453 | ND |
2019-08-13 | 5701-902-1225 | 12.6 ppb |
2019-08-13 | 5701-903-1420 | 12.7 ppb |
2019-08-13 | 5701-904-1509 | 12.4 ppb |
2019-08-13 | 5701-905-1135 | 10.6 ppb |
2019-08-13 | 5701-906-1239 | 12.6 ppb |
2019-08-13 | 5701-907-1157 | 13.7 ppb |
2019-08-19 | 5701-024-1325 | 1.77 ppb |
2019-08-20 | 5810-037-1115 | ND |
2019-08-26 | 5810-024-1355 | 1.80 ppb |
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 | 1.11 ppb |
2019-11-14 | 5701-901-1127 | ND |
2019-11-14 | 5701-902-1248 | 1.19 ppb |
2019-11-14 | 5701-903-1104 | 1.01 ppb |
2019-11-14 | 5701-904-1030 | ND |
2019-11-14 | 5701-905-1423 | 1.05 ppb |
2019-11-14 | 5701-906-1233 | 11.8 ppb |
2019-11-14 | 5701-907-1336 | 1.43 ppb |
2019-12-16 | 5701-028-1330 | ND |