Bromodichloromethane
Otay Water District
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 | 8.52 ppb | 32 | 32 | 6.80 ppb - 13.0 ppb |
2015 | 8.01 ppb | 32 | 32 | 4.50 ppb - 11.0 ppb |
2016 | 6.83 ppb | 32 | 32 | 2.70 ppb - 16.0 ppb |
2017 | 9.80 ppb | 35 | 32 | ND - 28.0 ppb |
2018 | 7.56 ppb | 32 | 32 | 3.90 ppb - 16.0 ppb |
2019 | 8.19 ppb | 36 | 35 | ND - 19.0 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 |
---|---|---|
2014-02-10 | 9590-900-0700 | 8.80 ppb |
2014-02-10 | 9590-901-0940 | 8.60 ppb |
2014-02-10 | 9590-902-0740 | 9.00 ppb |
2014-02-10 | 9590-903-1400 | 7.60 ppb |
2014-02-10 | 9590-904-1240 | 7.50 ppb |
2014-02-10 | 9590-905-1505 | 7.40 ppb |
2014-02-10 | 9590-906-1435 | 7.40 ppb |
2014-02-10 | 9590-907-1215 | 7.60 ppb |
2014-05-13 | 9590-900-0640 | 8.80 ppb |
2014-05-13 | 9590-901-0745 | 8.80 ppb |
2014-05-13 | 9590-902-0710 | 8.10 ppb |
2014-05-13 | 9590-903-1145 | 10.00 ppb |
2014-05-13 | 9590-904-1030 | 7.90 ppb |
2014-05-13 | 9590-905-1315 | 7.60 ppb |
2014-05-13 | 9590-906-1230 | 7.60 ppb |
2014-05-13 | 9590-907-0900 | 8.00 ppb |
2014-08-12 | 9590-900-0710 | 6.80 ppb |
2014-08-12 | 9590-901-0630 | 7.80 ppb |
2014-08-12 | 9590-902-0740 | 7.80 ppb |
2014-08-12 | 9590-903-1120 | 11.0 ppb |
2014-08-12 | 9590-904-1030 | 10.00 ppb |
2014-08-12 | 9590-905-1315 | 10.00 ppb |
2014-08-12 | 9590-906-1220 | 9.10 ppb |
2014-08-12 | 9590-907-0910 | 10.00 ppb |
2014-11-12 | 9590-900-0930 | 8.30 ppb |
2014-11-12 | 9590-901-0700 | 7.40 ppb |
2014-11-12 | 9590-902-0830 | 13.0 ppb |
2014-11-12 | 9590-903-1200 | 7.70 ppb |
2014-11-12 | 9590-904-1400 | 7.70 ppb |
2014-11-12 | 9590-905-1310 | 8.20 ppb |
2014-11-12 | 9590-906-1240 | 9.00 ppb |
2014-11-12 | 9590-907-1430 | 8.10 ppb |
2015-02-09 | 9590-900-0830 | 7.60 ppb |
2015-02-09 | 9590-901-0950 | 9.00 ppb |
2015-02-09 | 9590-902-0910 | 8.40 ppb |
2015-02-09 | 9590-903-1315 | 7.40 ppb |
2015-02-09 | 9590-904-1145 | 9.10 ppb |
2015-02-09 | 9590-905-1450 | 8.70 ppb |
2015-02-09 | 9590-906-1400 | 9.60 ppb |
2015-02-09 | 9590-907-1115 | 9.20 ppb |
2015-05-13 | 9590-900-0700 | 7.40 ppb |
2015-05-13 | 9590-901-0830 | 8.00 ppb |
2015-05-13 | 9590-902-0745 | 7.40 ppb |
2015-05-13 | 9590-903-1100 | 8.10 ppb |
2015-05-13 | 9590-904-1310 | 7.80 ppb |
2015-05-13 | 9590-905-1200 | 7.90 ppb |
2015-05-13 | 9590-906-1130 | 8.00 ppb |
2015-05-13 | 9590-907-1340 | 8.10 ppb |
2015-08-11 | 9590-900-0700 | 5.00 ppb |
2015-08-11 | 9590-901-0800 | 6.00 ppb |
2015-08-11 | 9590-902-0730 | 8.50 ppb |
2015-08-11 | 9590-903-1140 | 8.40 ppb |
2015-08-11 | 9590-904-1050 | 7.70 ppb |
2015-08-11 | 9590-905-1350 | 7.60 ppb |
2015-08-11 | 9590-906-1235 | 8.30 ppb |
2015-08-11 | 9590-907-0930 | 8.00 ppb |
2015-11-09 | 9590-900-1410 | 6.30 ppb |
2015-11-09 | 9590-901-1500 | 4.50 ppb |
2015-11-09 | 9590-902-1440 | 11.0 ppb |
2015-11-09 | 9590-903-1120 | 8.80 ppb |
2015-11-09 | 9590-904-1025 | 8.50 ppb |
2015-11-09 | 9590-905-1250 | 9.00 ppb |
2015-11-09 | 9590-906-1210 | 8.40 ppb |
2015-11-09 | 9590-907-0845 | 8.70 ppb |
2016-02-09 | 9590-900-1350 | 7.30 ppb |
2016-02-09 | 9590-901-1530 | 8.60 ppb |
2016-02-09 | 9590-902-1430 | 8.60 ppb |
2016-02-09 | 9590-903-1050 | 3.20 ppb |
2016-02-09 | 9590-904-0940 | 2.70 ppb |
2016-02-09 | 9590-905-1200 | 2.70 ppb |
2016-02-09 | 9590-906-1130 | 3.00 ppb |
2016-02-09 | 9590-907-1300 | 2.80 ppb |
2016-05-10 | 9590-900-1200 | 6.60 ppb |
2016-05-10 | 9590-901-1310 | 8.80 ppb |
2016-05-10 | 9590-902-1235 | 16.0 ppb |
2016-05-10 | 9590-903-0900 | 5.90 ppb |
2016-05-10 | 9590-904-0930 | 4.00 ppb |
2016-05-10 | 9590-905-1000 | 4.50 ppb |
2016-05-10 | 9590-906-1030 | 4.80 ppb |
2016-05-10 | 9590-907-1100 | 5.30 ppb |
2016-08-09 | 9590-900-0825 | 8.80 ppb |
2016-08-09 | 9590-901-0900 | 8.10 ppb |
2016-08-09 | 9590-902-0630 | 7.40 ppb |
2016-08-09 | 9590-903-1145 | 11.0 ppb |
2016-08-09 | 9590-904-1040 | 8.60 ppb |
2016-08-09 | 9590-905-1320 | 13.0 ppb |
2016-08-09 | 9590-906-1220 | 8.50 ppb |
2016-08-09 | 9590-907-1010 | 9.00 ppb |
2016-11-14 | 9590-900-1000 | 7.20 ppb |
2016-11-14 | 9590-901-0925 | 10.00 ppb |
2016-11-14 | 9590-902-0750 | 10.00 ppb |
2016-11-14 | 9590-903-1150 | 4.00 ppb |
2016-11-14 | 9590-904-1125 | 4.70 ppb |
2016-11-14 | 9590-905-1245 | 4.70 ppb |
2016-11-14 | 9590-906-1220 | 4.30 ppb |
2016-11-14 | 9590-907-1100 | 4.40 ppb |
2017-02-14 | 9590-900-1210 | 9.20 ppb |
2017-02-14 | 9590-901-1330 | 14.0 ppb |
2017-02-14 | 9590-902-1300 | 20.0 ppb |
2017-02-14 | 9590-903-1010 | 3.30 ppb |
2017-02-14 | 9590-904-0855 | 2.10 ppb |
2017-02-14 | 9590-905-1120 | 2.00 ppb |
2017-02-14 | 9590-906-1045 | 2.20 ppb |
2017-02-14 | 9590-907-0830 | 1.70 ppb |
2017-04-06 | 9590-037-1100 | ND |
2017-05-10 | 9590-900-0800 | 11.0 ppb |
2017-05-10 | 9590-901-0900 | 11.0 ppb |
2017-05-10 | 9590-902-0830 | 13.0 ppb |
2017-05-10 | 9590-903-1145 | 13.0 ppb |
2017-05-10 | 9590-904-1120 | 12.0 ppb |
2017-05-10 | 9590-905-1240 | 12.0 ppb |
2017-05-10 | 9590-906-1210 | 12.0 ppb |
2017-05-10 | 9590-907-1050 | 13.0 ppb |
2017-07-07 | 9590-037-1032 | ND |
2017-08-14 | 9590-900-1330 | 10.00 ppb |
2017-08-14 | 9590-901-1400 | 10.00 ppb |
2017-08-14 | 9590-902-0900 | 9.60 ppb |
2017-08-14 | 9590-903-1130 | 10.00 ppb |
2017-08-14 | 9590-904-1030 | 10.00 ppb |
2017-08-14 | 9590-905-1230 | 11.0 ppb |
2017-08-14 | 9590-906-1200 | 10.00 ppb |
2017-08-14 | 9590-907-1000 | 11.0 ppb |
2017-10-10 | 9590-037-1045 | ND |
2017-11-13 | 9590-900-1300 | 11.0 ppb |
2017-11-13 | 9590-901-1400 | 13.0 ppb |
2017-11-13 | 9590-902-1330 | 28.0 ppb |
2017-11-13 | 9590-903-1110 | 10.00 ppb |
2017-11-13 | 9590-904-1015 | 12.0 ppb |
2017-11-13 | 9590-905-1215 | 12.0 ppb |
2017-11-13 | 9590-906-1130 | 12.0 ppb |
2017-11-13 | 9590-907-0950 | 12.0 ppb |
2018-02-12 | 9590-900-1230 | 14.0 ppb |
2018-02-12 | 9590-901-1350 | 14.0 ppb |
2018-02-12 | 9590-902-1320 | 16.0 ppb |
2018-02-12 | 9590-903-1030 | 6.50 ppb |
2018-02-12 | 9590-904-0925 | 6.40 ppb |
2018-02-12 | 9590-905-1120 | 6.80 ppb |
2018-02-12 | 9590-906-1100 | 6.60 ppb |
2018-02-12 | 9590-907-0900 | 7.00 ppb |
2018-05-14 | 9590-900-1330 | 6.70 ppb |
2018-05-14 | 9590-901-0900 | 8.70 ppb |
2018-05-14 | 9590-902-0820 | 16.0 ppb |
2018-05-14 | 9590-903-1125 | 3.90 ppb |
2018-05-14 | 9590-904-1030 | 4.00 ppb |
2018-05-14 | 9590-905-1230 | 4.50 ppb |
2018-05-14 | 9590-906-1200 | 4.00 ppb |
2018-05-14 | 9590-907-1000 | 4.20 ppb |
2018-08-13 | 9590-900-1230 | 6.40 ppb |
2018-08-13 | 9590-901-1330 | 8.80 ppb |
2018-08-13 | 9590-902-1300 | 13.0 ppb |
2018-08-13 | 9590-903-1000 | 8.40 ppb |
2018-08-13 | 9590-904-0900 | 5.60 ppb |
2018-08-13 | 9590-905-1100 | 5.40 ppb |
2018-08-13 | 9590-906-1030 | 5.60 ppb |
2018-08-13 | 9590-907-0830 | 5.30 ppb |
2018-11-13 | 9590-900-1340 | 8.90 ppb |
2018-11-13 | 9590-901-1435 | 11.0 ppb |
2018-11-13 | 9590-902-1410 | 7.50 ppb |
2018-11-13 | 9590-903-1100 | 7.60 ppb |
2018-11-13 | 9590-904-0900 | 5.30 ppb |
2018-11-13 | 9590-905-1215 | 4.30 ppb |
2018-11-13 | 9590-906-1130 | 4.70 ppb |
2018-11-13 | 9590-907-0830 | 4.90 ppb |
2019-02-12 | 9590-900-0815 | 4.60 ppb |
2019-02-12 | 9590-901-0940 | 7.10 ppb |
2019-02-12 | 9590-902-0845 | 5.00 ppb |
2019-02-12 | 9590-903-1120 | 3.20 ppb |
2019-02-12 | 9590-904-1320 | 2.00 ppb |
2019-02-12 | 9590-905-1220 | 2.10 ppb |
2019-02-12 | 9590-906-1155 | 2.30 ppb |
2019-02-12 | 9590-907-1345 | 2.10 ppb |
2019-05-15 | 9590-003-1010 | ND |
2019-05-15 | 9590-005-1300 | 14.0 ppb |
2019-05-15 | 9590-900-1240 | 19.0 ppb |
2019-05-15 | 9590-901-1140 | 18.0 ppb |
2019-05-15 | 9590-902-1210 | 18.0 ppb |
2019-05-15 | 9590-903-0840 | 9.00 ppb |
2019-05-15 | 9590-904-1040 | 2.60 ppb |
2019-05-15 | 9590-905-0940 | 1.90 ppb |
2019-05-15 | 9590-906-0910 | 4.00 ppb |
2019-05-15 | 9590-907-1100 | 3.40 ppb |
2019-08-12 | 4790-900-0805 | 18.0 ppb |
2019-08-12 | 4790-901-0905 | 12.0 ppb |
2019-08-12 | 4790-902-0835 | 14.0 ppb |
2019-08-12 | 4790-903-1050 | 12.0 ppb |
2019-08-12 | 4790-904-1330 | 9.40 ppb |
2019-08-12 | 4790-905-1215 | 9.30 ppb |
2019-08-12 | 4790-906-1145 | 9.20 ppb |
2019-08-12 | 4790-907-1015 | 9.50 ppb |
2019-11-12 | 4790-003-1245 | 4.30 ppb |
2019-11-12 | 4790-005-0945 | 12.0 ppb |
2019-11-12 | 4790-900-0810 | 12.0 ppb |
2019-11-12 | 4790-901-0915 | 14.0 ppb |
2019-11-12 | 4790-902-0840 | 16.0 ppb |
2019-11-12 | 4790-903-1100 | 5.80 ppb |
2019-11-12 | 4790-904-1315 | 4.70 ppb |
2019-11-12 | 4790-905-1215 | 4.70 ppb |
2019-11-12 | 4790-906-1145 | 4.80 ppb |
2019-11-12 | 4790-907-1030 | 4.90 ppb |