Bromodichloromethane
City of Napa
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 | 11.1 ppb | 39 | 37 | ND - 24.0 ppb |
2015 | 18.9 ppb | 44 | 44 | 2.40 ppb - 28.0 ppb |
2016 | 10.8 ppb | 37 | 37 | 2.80 ppb - 17.0 ppb |
2017 | 10.7 ppb | 44 | 44 | 2.30 ppb - 29.0 ppb |
2018 | 8.92 ppb | 45 | 45 | 2.40 ppb - 14.0 ppb |
2019 | 9.43 ppb | 48 | 48 | 2.30 ppb - 16.0 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 |
---|---|---|
2014-01-08 | 1233-007-0935 | 1.50 ppb |
2014-01-08 | 1233-008-1030 | 7.40 ppb |
2014-01-08 | 1233-009-1000 | 3.30 ppb |
2014-01-08 | 1233-010-1050 | 5.30 ppb |
2014-01-08 | 1233-011-1245 | 8.00 ppb |
2014-01-08 | 1233-012-1305 | 3.90 ppb |
2014-01-08 | 1233-024-1230 | 3.60 ppb |
2014-01-08 | 1233-025-1110 | 3.90 ppb |
2014-01-08 | 1233-028-1315 | 4.50 ppb |
2014-04-02 | 1233-006-1245 | 8.40 ppb |
2014-04-02 | 1233-008-1055 | 19.0 ppb |
2014-04-02 | 1233-009-1040 | 11.0 ppb |
2014-04-02 | 1233-010-1110 | 12.0 ppb |
2014-04-02 | 1233-011-1330 | 10.00 ppb |
2014-04-02 | 1233-012-1355 | 13.0 ppb |
2014-04-02 | 1233-024-1315 | 9.60 ppb |
2014-04-02 | 1233-025-1130 | 17.0 ppb |
2014-04-02 | 1233-028-1345 | 13.0 ppb |
2014-07-09 | 1233-005-1145 | 2.70 ppb |
2014-07-09 | 1233-006-1245 | 14.0 ppb |
2014-07-09 | 1233-007-0925 | 7.70 ppb |
2014-07-09 | 1233-008-1030 | 15.0 ppb |
2014-07-09 | 1233-009-1015 | 14.0 ppb |
2014-07-09 | 1233-010-1040 | 12.0 ppb |
2014-07-09 | 1233-011-1410 | 15.0 ppb |
2014-07-09 | 1233-012-1440 | 13.0 ppb |
2014-07-09 | 1233-024-1355 | 21.0 ppb |
2014-07-09 | 1233-025-1105 | 6.50 ppb |
2014-07-09 | 1233-028-1430 | 19.0 ppb |
2014-10-01 | 1233-006-1220 | 19.0 ppb |
2014-10-01 | 1233-007-1010 | 7.70 ppb |
2014-10-01 | 1233-008-1050 | 17.0 ppb |
2014-10-01 | 1233-009-1035 | 15.0 ppb |
2014-10-01 | 1233-010-1105 | 13.0 ppb |
2014-10-01 | 1233-011-1320 | ND |
2014-10-01 | 1233-012-1355 | ND |
2014-10-01 | 1233-024-1300 | 24.0 ppb |
2014-10-01 | 1233-025-1125 | 19.0 ppb |
2014-10-01 | 1233-028-1335 | 24.0 ppb |
2015-01-08 | 1233-007-1000 | 19.0 ppb |
2015-01-08 | 1233-008-1105 | 19.0 ppb |
2015-01-08 | 1233-009-1050 | 22.0 ppb |
2015-01-08 | 1233-010-1115 | 22.0 ppb |
2015-01-08 | 1233-011-1215 | 24.0 ppb |
2015-01-08 | 1233-012-1330 | 25.0 ppb |
2015-01-08 | 1233-024-1155 | 21.0 ppb |
2015-01-08 | 1233-025-1130 | 17.0 ppb |
2015-01-08 | 1233-031-1320 | 22.0 ppb |
2015-04-01 | 1233-007-0950 | 16.0 ppb |
2015-04-01 | 1233-008-1045 | 23.0 ppb |
2015-04-01 | 1233-009-1030 | 22.0 ppb |
2015-04-01 | 1233-010-1055 | 18.0 ppb |
2015-04-01 | 1233-011-1330 | 25.0 ppb |
2015-04-01 | 1233-012-1355 | 24.0 ppb |
2015-04-01 | 1233-024-1315 | 27.0 ppb |
2015-04-01 | 1233-025-1115 | 22.0 ppb |
2015-04-01 | 1233-028-1340 | 20.0 ppb |
2015-07-21 | 1233-005-1120 | 4.60 ppb |
2015-07-21 | 1233-006-1415 | 27.0 ppb |
2015-07-21 | 1233-007-0940 | 13.0 ppb |
2015-07-21 | 1233-008-1035 | 24.0 ppb |
2015-07-21 | 1233-009-1020 | 21.0 ppb |
2015-07-21 | 1233-010-1045 | 24.0 ppb |
2015-07-21 | 1233-011-1505 | 24.0 ppb |
2015-07-21 | 1233-012-1530 | 24.0 ppb |
2015-07-21 | 1233-024-1450 | 24.0 ppb |
2015-07-21 | 1233-025-1200 | 12.0 ppb |
2015-07-21 | 1233-028-1520 | 7.00 ppb |
2015-10-07 | 1233-005-1155 | 3.30 ppb |
2015-10-07 | 1233-006-1325 | 5.30 ppb |
2015-10-07 | 1233-007-1110 | 12.0 ppb |
2015-10-07 | 1233-008-1510 | 28.0 ppb |
2015-10-07 | 1233-009-1525 | 26.0 ppb |
2015-10-07 | 1233-010-1455 | 20.0 ppb |
2015-10-07 | 1233-011-1415 | 28.0 ppb |
2015-10-07 | 1233-012-1440 | 26.0 ppb |
2015-10-07 | 1233-024-1400 | 28.0 ppb |
2015-10-07 | 1233-025-1210 | 12.0 ppb |
2015-10-07 | 1233-028-1430 | 21.0 ppb |
2015-11-04 | 1233-006-1220 | 13.0 ppb |
2015-11-04 | 1233-007-1030 | 5.10 ppb |
2015-12-02 | 1233-006-1145 | 7.90 ppb |
2015-12-02 | 1233-007-1030 | 2.40 ppb |
2016-01-08 | 1233-008-1245 | 17.0 ppb |
2016-01-08 | 1233-009-1230 | 12.0 ppb |
2016-01-08 | 1233-010-1300 | 7.00 ppb |
2016-01-08 | 1233-011-1355 | 13.0 ppb |
2016-01-08 | 1233-012-1430 | 14.0 ppb |
2016-01-08 | 1233-024-1340 | 16.0 ppb |
2016-01-08 | 1233-025-1320 | 15.0 ppb |
2016-01-08 | 1233-028-1415 | 12.0 ppb |
2016-04-06 | 1233-006-1230 | 5.30 ppb |
2016-04-06 | 1233-008-1100 | 11.0 ppb |
2016-04-06 | 1233-009-1045 | 9.60 ppb |
2016-04-06 | 1233-010-1115 | 10.00 ppb |
2016-04-06 | 1233-011-1345 | 8.30 ppb |
2016-04-06 | 1233-024-1330 | 7.30 ppb |
2016-04-06 | 1233-025-1130 | 12.0 ppb |
2016-04-06 | 1233-028-1400 | 7.30 ppb |
2016-05-04 | 1233-007-1025 | 17.0 ppb |
2016-07-27 | 1233-006-1545 | 7.90 ppb |
2016-07-27 | 1233-007-1245 | 6.60 ppb |
2016-07-27 | 1233-008-1320 | 14.0 ppb |
2016-07-27 | 1233-009-1305 | 10.00 ppb |
2016-07-27 | 1233-010-1335 | 8.30 ppb |
2016-07-27 | 1233-011-1655 | 11.0 ppb |
2016-07-27 | 1233-012-1725 | 10.00 ppb |
2016-07-27 | 1233-024-1645 | 9.90 ppb |
2016-07-27 | 1233-025-1350 | 13.0 ppb |
2016-07-27 | 1233-028-1710 | 8.80 ppb |
2016-10-05 | 1233-006-1110 | 7.70 ppb |
2016-10-05 | 1233-007-0900 | 6.50 ppb |
2016-10-05 | 1233-008-1000 | 17.0 ppb |
2016-10-05 | 1233-009-0945 | 13.0 ppb |
2016-10-05 | 1233-010-1015 | 9.80 ppb |
2016-10-05 | 1233-011-1210 | 11.0 ppb |
2016-10-05 | 1233-012-1230 | 15.0 ppb |
2016-10-05 | 1233-024-1155 | 11.0 ppb |
2016-10-05 | 1233-025-1030 | 14.0 ppb |
2016-10-05 | 1233-028-1225 | 2.80 ppb |
2017-01-11 | 1233-007-1040 | 11.0 ppb |
2017-01-11 | 1233-008-1125 | 27.0 ppb |
2017-01-11 | 1233-009-1115 | 27.0 ppb |
2017-01-11 | 1233-010-1135 | 24.0 ppb |
2017-01-11 | 1233-011-1430 | 26.0 ppb |
2017-01-11 | 1233-012-1500 | 26.0 ppb |
2017-01-11 | 1233-024-1415 | 27.0 ppb |
2017-01-11 | 1233-025-1155 | 27.0 ppb |
2017-01-11 | 1233-028-1445 | 29.0 ppb |
2017-02-01 | 1233-007-1050 | 5.50 ppb |
2017-04-05 | 1233-006-1040 | 5.20 ppb |
2017-04-05 | 1233-008-0912 | 8.90 ppb |
2017-04-05 | 1233-009-0900 | 7.80 ppb |
2017-04-05 | 1233-010-0928 | 7.90 ppb |
2017-04-05 | 1233-011-1153 | 6.70 ppb |
2017-04-05 | 1233-012-1214 | 8.70 ppb |
2017-04-05 | 1233-024-1137 | 5.90 ppb |
2017-04-05 | 1233-025-0950 | 7.60 ppb |
2017-04-05 | 1233-028-1223 | 7.10 ppb |
2017-07-20 | 1233-006-1330 | 6.10 ppb |
2017-07-20 | 1233-007-1050 | 16.0 ppb |
2017-07-20 | 1233-008-1141 | 8.30 ppb |
2017-07-20 | 1233-009-1127 | 9.60 ppb |
2017-07-20 | 1233-010-1155 | 14.0 ppb |
2017-07-20 | 1233-011-1455 | 8.10 ppb |
2017-07-20 | 1233-012-1515 | 7.10 ppb |
2017-07-20 | 1233-024-1436 | 6.90 ppb |
2017-07-20 | 1233-025-1216 | 8.90 ppb |
2017-07-20 | 1233-028-1536 | 7.80 ppb |
2017-09-06 | 1233-006-0955 | 7.10 ppb |
2017-09-06 | 1233-007-0845 | 7.10 ppb |
2017-09-13 | 1233-005-0840 | 5.10 ppb |
2017-10-04 | 1233-005-1154 | 2.30 ppb |
2017-10-04 | 1233-007-0903 | 5.00 ppb |
2017-10-04 | 1233-008-0959 | 5.20 ppb |
2017-10-04 | 1233-009-0943 | 6.40 ppb |
2017-10-04 | 1233-010-1014 | 4.50 ppb |
2017-10-04 | 1233-011-1059 | 5.70 ppb |
2017-10-04 | 1233-012-1034 | 5.10 ppb |
2017-10-04 | 1233-024-1116 | 5.10 ppb |
2017-10-04 | 1233-025-1138 | 3.50 ppb |
2017-10-04 | 1233-028-1046 | 8.50 ppb |
2017-11-01 | 1233-006-1130 | 7.10 ppb |
2017-12-06 | 1233-007-1150 | 4.10 ppb |
2018-01-10 | 1233-007-1230 | 7.60 ppb |
2018-01-10 | 1233-008-1310 | 9.70 ppb |
2018-01-10 | 1233-009-1255 | 9.00 ppb |
2018-01-10 | 1233-010-1325 | 7.90 ppb |
2018-01-10 | 1233-011-1525 | 9.40 ppb |
2018-01-10 | 1233-012-1545 | 8.70 ppb |
2018-01-10 | 1233-024-1515 | 9.80 ppb |
2018-01-10 | 1233-025-1340 | 10.00 ppb |
2018-01-10 | 1233-028-1535 | 3.40 ppb |
2018-04-11 | 1233-006-1430 | 2.90 ppb |
2018-04-11 | 1233-008-1105 | 14.0 ppb |
2018-04-11 | 1233-009-1045 | 11.0 ppb |
2018-04-11 | 1233-010-1125 | 11.0 ppb |
2018-04-11 | 1233-011-1230 | 8.40 ppb |
2018-04-11 | 1233-012-1200 | 11.0 ppb |
2018-04-11 | 1233-024-1245 | 8.90 ppb |
2018-04-11 | 1233-025-1140 | 10.00 ppb |
2018-04-11 | 1233-028-1215 | 13.0 ppb |
2018-06-06 | 1233-006-1240 | 6.40 ppb |
2018-06-06 | 1233-007-1040 | 11.0 ppb |
2018-07-11 | 1233-006-1015 | 9.20 ppb |
2018-07-11 | 1233-007-1200 | 4.80 ppb |
2018-08-08 | 1233-006-1310 | 10.00 ppb |
2018-08-08 | 1233-007-1000 | 5.50 ppb |
2018-09-05 | 1233-006-1045 | 7.80 ppb |
2018-09-05 | 1233-007-1230 | 4.10 ppb |
2018-09-18 | 1233-008-1015 | 12.0 ppb |
2018-09-18 | 1233-009-1000 | 11.0 ppb |
2018-09-18 | 1233-010-1040 | 8.40 ppb |
2018-09-18 | 1233-011-1225 | 9.40 ppb |
2018-09-18 | 1233-012-1300 | 10.00 ppb |
2018-09-18 | 1233-024-1205 | 13.0 ppb |
2018-09-18 | 1233-025-1100 | 11.0 ppb |
2018-09-18 | 1233-028-1245 | 9.10 ppb |
2018-10-03 | 1233-008-1040 | 10.00 ppb |
2018-10-03 | 1233-009-1025 | 9.80 ppb |
2018-10-03 | 1233-010-1055 | 8.40 ppb |
2018-10-03 | 1233-011-1240 | 8.70 ppb |
2018-10-03 | 1233-012-1320 | 7.60 ppb |
2018-10-03 | 1233-024-1220 | 10.00 ppb |
2018-10-03 | 1233-025-1110 | 11.0 ppb |
2018-10-03 | 1233-028-1305 | 8.60 ppb |
2018-11-07 | 1233-006-1225 | 7.50 ppb |
2018-11-07 | 1233-007-1020 | 2.40 ppb |
2018-12-05 | 1233-007-1030 | 8.90 ppb |
2019-01-09 | 1233-007-0940 | 6.30 ppb |
2019-01-09 | 1233-008-1000 | 12.0 ppb |
2019-01-09 | 1233-009-0945 | 14.0 ppb |
2019-01-09 | 1233-010-1010 | 7.30 ppb |
2019-01-09 | 1233-011-1125 | 14.0 ppb |
2019-01-09 | 1233-012-1150 | 11.0 ppb |
2019-01-09 | 1233-024-1105 | 15.0 ppb |
2019-01-09 | 1233-025-1030 | 16.0 ppb |
2019-01-09 | 1233-028-1135 | 14.0 ppb |
2019-03-06 | 1233-006-1020 | 3.50 ppb |
2019-04-03 | 1233-005-1045 | 8.30 ppb |
2019-04-03 | 1233-006-1115 | 4.70 ppb |
2019-04-03 | 1233-009-1015 | 8.10 ppb |
2019-04-03 | 1233-011-1145 | 7.80 ppb |
2019-04-03 | 1233-012-1215 | 8.80 ppb |
2019-04-03 | 1233-024-1130 | 8.40 ppb |
2019-04-03 | 1233-025-1055 | 8.50 ppb |
2019-04-03 | 1233-028-1200 | 6.50 ppb |
2019-05-01 | 1233-006-1040 | 4.90 ppb |
2019-06-12 | 1233-006-1220 | 6.20 ppb |
2019-06-12 | 1233-007-1000 | 8.60 ppb |
2019-07-10 | 1233-006-1200 | 6.10 ppb |
2019-07-10 | 1233-007-0830 | 6.00 ppb |
2019-07-10 | 1233-008-0915 | 16.0 ppb |
2019-07-10 | 1233-009-0900 | 7.80 ppb |
2019-07-10 | 1233-010-0930 | 9.50 ppb |
2019-07-10 | 1233-011-1245 | 10.00 ppb |
2019-07-10 | 1233-012-1315 | 9.80 ppb |
2019-07-10 | 1233-024-1230 | 9.50 ppb |
2019-07-10 | 1233-025-0950 | 12.0 ppb |
2019-07-10 | 1233-028-1300 | 13.0 ppb |
2019-08-07 | 1233-006-1120 | 8.30 ppb |
2019-08-07 | 1233-007-1010 | 6.50 ppb |
2019-09-04 | 1233-006-1050 | 9.40 ppb |
2019-09-04 | 1233-007-0915 | 6.00 ppb |
2019-10-02 | 1233-006-1100 | 9.20 ppb |
2019-10-02 | 1233-007-0840 | 5.20 ppb |
2019-10-02 | 1233-008-0935 | 13.0 ppb |
2019-10-02 | 1233-009-0910 | 11.0 ppb |
2019-10-02 | 1233-010-0950 | 9.10 ppb |
2019-10-02 | 1233-011-1200 | 11.0 ppb |
2019-10-02 | 1233-012-1230 | 11.0 ppb |
2019-10-02 | 1233-024-1140 | 13.0 ppb |
2019-10-02 | 1233-025-1005 | 13.0 ppb |
2019-10-02 | 1233-028-1215 | 13.0 ppb |
2019-11-06 | 1233-006-1045 | 9.40 ppb |
2019-11-06 | 1233-007-0915 | 2.30 ppb |
2019-12-04 | 1233-007-1150 | 8.50 ppb |