Dibromochloromethane
California Water Service - San Mateo
Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane 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 |
---|---|---|---|---|
2014 | 0.327 ppb | 32 | 5 | ND - 3.16 ppb |
2015 | 0.759 ppb | 32 | 15 | ND - 3.08 ppb |
2016 | 0.212 ppb | 32 | 8 | ND - 0.910 ppb |
2017 | 0.600 ppb | 32 | 16 | ND - 2.13 ppb |
2018 | 0.905 ppb | 32 | 8 | ND - 6.02 ppb |
2019 | 0.275 ppb | 32 | 8 | ND - 1.34 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.1 ppb
The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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 | 5701-900-1205 | 1.62 ppb |
2014-02-05 | 5701-901-1120 | ND |
2014-02-05 | 5701-902-1105 | ND |
2014-02-05 | 5701-903-0945 | 3.16 ppb |
2014-02-05 | 5701-904-1140 | ND |
2014-02-05 | 5701-905-1000 | 3.10 ppb |
2014-02-05 | 5701-906-1020 | 0.530 ppb |
2014-02-05 | 5701-907-1225 | 2.06 ppb |
2014-05-07 | 5701-900-1515 | ND |
2014-05-07 | 5701-901-1545 | ND |
2014-05-07 | 5701-902-1600 | ND |
2014-05-07 | 5701-903-1540 | ND |
2014-05-07 | 5701-904-1705 | ND |
2014-05-07 | 5701-905-1600 | ND |
2014-05-07 | 5701-906-1434 | ND |
2014-05-07 | 5701-907-1455 | ND |
2014-08-06 | 5701-900-1300 | ND |
2014-08-06 | 5701-901-1100 | ND |
2014-08-06 | 5701-902-1115 | ND |
2014-08-06 | 5701-903-1250 | ND |
2014-08-06 | 5701-904-1025 | ND |
2014-08-06 | 5701-905-1305 | ND |
2014-08-06 | 5701-906-1140 | ND |
2014-08-06 | 5701-907-1355 | ND |
2014-11-03 | 5701-900-1300 | ND |
2014-11-03 | 5701-901-1245 | ND |
2014-11-03 | 5701-902-1230 | ND |
2014-11-03 | 5701-903-1150 | ND |
2014-11-03 | 5701-904-1350 | ND |
2014-11-03 | 5701-905-1125 | ND |
2014-11-03 | 5701-906-1335 | ND |
2014-11-03 | 5701-907-1320 | ND |
2015-02-04 | 5701-900-0850 | 1.97 ppb |
2015-02-04 | 5701-901-0850 | 2.51 ppb |
2015-02-04 | 5701-902-0850 | 2.82 ppb |
2015-02-04 | 5701-903-0850 | 1.62 ppb |
2015-02-04 | 5701-904-0850 | 3.08 ppb |
2015-02-04 | 5701-905-0850 | 1.66 ppb |
2015-02-04 | 5701-906-0850 | 2.57 ppb |
2015-02-04 | 5701-907-0850 | 1.91 ppb |
2015-05-06 | 5701-900-0832 | ND |
2015-05-06 | 5701-901-0832 | ND |
2015-05-06 | 5701-902-0832 | ND |
2015-05-06 | 5701-903-0832 | ND |
2015-05-06 | 5701-904-0832 | ND |
2015-05-06 | 5701-905-0832 | ND |
2015-05-06 | 5701-906-0832 | ND |
2015-05-06 | 5701-907-0832 | ND |
2015-08-04 | 5701-900-0827 | ND |
2015-08-04 | 5701-901-0827 | ND |
2015-08-04 | 5701-902-0827 | ND |
2015-08-04 | 5701-903-0827 | ND |
2015-08-04 | 5701-904-0827 | ND |
2015-08-04 | 5701-905-0827 | ND |
2015-08-04 | 5701-906-0827 | ND |
2015-08-04 | 5701-907-0827 | ND |
2015-11-03 | 5701-900-0818 | 1.15 ppb |
2015-11-03 | 5701-901-0818 | 0.690 ppb |
2015-11-03 | 5701-902-0818 | 0.770 ppb |
2015-11-03 | 5701-903-0818 | 1.14 ppb |
2015-11-03 | 5701-904-0818 | 0.580 ppb |
2015-11-03 | 5701-905-0818 | 1.17 ppb |
2015-11-03 | 5701-906-0818 | 0.650 ppb |
2015-12-09 | 5810-907-0840 | ND |
2016-02-02 | 5701-900-0858 | 0.900 ppb |
2016-02-02 | 5701-901-0858 | 0.890 ppb |
2016-02-02 | 5701-902-0858 | 0.870 ppb |
2016-02-02 | 5701-903-0858 | 0.730 ppb |
2016-02-02 | 5701-904-0858 | 0.860 ppb |
2016-02-02 | 5701-905-0858 | 0.730 ppb |
2016-02-02 | 5701-906-0858 | 0.880 ppb |
2016-02-02 | 5701-907-0858 | 0.910 ppb |
2016-05-02 | 5701-900-0714 | ND |
2016-05-02 | 5701-901-0714 | ND |
2016-05-02 | 5701-902-0714 | ND |
2016-05-02 | 5701-903-0714 | ND |
2016-05-02 | 5701-904-0714 | ND |
2016-05-02 | 5701-905-0714 | ND |
2016-05-02 | 5701-906-0714 | ND |
2016-05-02 | 5701-907-0714 | ND |
2016-08-02 | 5701-900-0856 | ND |
2016-08-02 | 5701-901-0856 | ND |
2016-08-02 | 5701-902-0856 | ND |
2016-08-02 | 5701-903-0856 | ND |
2016-08-02 | 5701-904-0856 | ND |
2016-08-02 | 5701-905-0856 | ND |
2016-08-02 | 5701-906-0856 | ND |
2016-08-02 | 5701-907-0856 | ND |
2016-11-07 | 5701-900-0931 | ND |
2016-11-07 | 5701-901-0931 | ND |
2016-11-07 | 5701-902-0931 | ND |
2016-11-07 | 5701-903-0931 | ND |
2016-11-07 | 5701-904-0931 | ND |
2016-11-07 | 5701-905-0931 | ND |
2016-11-07 | 5701-906-0931 | ND |
2016-11-09 | 5701-907-0844 | ND |
2017-02-06 | 5701-900-0653 | 1.04 ppb |
2017-02-06 | 5701-901-0653 | 0.820 ppb |
2017-02-06 | 5701-902-0653 | 0.810 ppb |
2017-02-06 | 5701-903-0653 | 0.930 ppb |
2017-02-06 | 5701-904-0654 | 0.760 ppb |
2017-02-06 | 5701-905-0654 | 0.910 ppb |
2017-02-06 | 5701-906-0654 | 0.790 ppb |
2017-02-06 | 5701-907-0654 | 0.710 ppb |
2017-05-01 | 5810-900-1510 | ND |
2017-05-01 | 5810-901-1100 | ND |
2017-05-01 | 5810-902-1145 | ND |
2017-05-01 | 5810-903-1440 | ND |
2017-05-01 | 5810-904-1115 | ND |
2017-05-01 | 5810-905-1455 | ND |
2017-05-01 | 5810-906-1030 | ND |
2017-05-01 | 5810-907-1045 | ND |
2017-08-09 | 5810-900-0820 | ND |
2017-08-09 | 5810-901-1140 | ND |
2017-08-09 | 5810-902-1150 | ND |
2017-08-09 | 5810-903-1315 | ND |
2017-08-09 | 5810-904-0740 | ND |
2017-08-09 | 5810-905-1300 | ND |
2017-08-09 | 5810-906-1205 | ND |
2017-08-09 | 5810-907-0900 | ND |
2017-11-08 | 5701-900-0904 | 0.990 ppb |
2017-11-08 | 5701-901-0904 | 1.80 ppb |
2017-11-08 | 5701-902-0904 | 1.92 ppb |
2017-11-08 | 5701-903-0904 | 0.880 ppb |
2017-11-08 | 5701-904-0904 | 2.13 ppb |
2017-11-08 | 5701-905-0904 | 1.000 ppb |
2017-11-08 | 5701-906-0904 | 1.78 ppb |
2017-11-08 | 5701-907-0904 | 1.94 ppb |
2018-02-05 | 5810-900-1250 | ND |
2018-02-05 | 5810-901-1220 | ND |
2018-02-05 | 5810-902-1205 | ND |
2018-02-05 | 5810-903-1020 | ND |
2018-02-05 | 5810-904-1235 | ND |
2018-02-05 | 5810-905-1315 | ND |
2018-02-05 | 5810-906-0935 | ND |
2018-02-05 | 5810-907-0955 | ND |
2018-05-07 | 5701-900-0852 | ND |
2018-05-07 | 5701-901-0852 | ND |
2018-05-07 | 5701-902-0852 | ND |
2018-05-07 | 5701-903-0852 | ND |
2018-05-07 | 5701-904-0852 | ND |
2018-05-07 | 5701-905-0852 | ND |
2018-05-07 | 5701-906-0852 | ND |
2018-05-07 | 5701-907-0852 | ND |
2018-08-06 | 5701-900-0809 | ND |
2018-08-06 | 5701-901-0809 | ND |
2018-08-06 | 5701-902-0809 | ND |
2018-08-06 | 5701-903-0809 | ND |
2018-08-06 | 5701-904-0809 | ND |
2018-08-06 | 5701-905-0809 | ND |
2018-08-06 | 5701-906-0809 | ND |
2018-08-06 | 5701-907-0809 | ND |
2018-11-05 | 5701-900-1021 | 1.000 ppb |
2018-11-05 | 5701-901-1021 | 4.96 ppb |
2018-11-05 | 5701-902-1021 | 4.68 ppb |
2018-11-05 | 5701-903-1021 | 1.81 ppb |
2018-11-05 | 5701-904-1021 | 5.55 ppb |
2018-11-05 | 5701-905-1021 | 2.56 ppb |
2018-11-05 | 5701-906-1021 | 6.02 ppb |
2018-11-05 | 5701-907-1021 | 2.37 ppb |
2019-02-06 | 5701-900-0623 | 0.970 ppb |
2019-02-06 | 5701-901-0623 | 1.32 ppb |
2019-02-06 | 5701-902-0623 | 1.34 ppb |
2019-02-06 | 5701-903-0623 | 0.870 ppb |
2019-02-06 | 5701-904-0623 | 1.02 ppb |
2019-02-06 | 5701-905-0623 | 0.900 ppb |
2019-02-06 | 5701-906-0623 | 1.20 ppb |
2019-02-06 | 5701-907-0623 | 1.17 ppb |
2019-05-07 | 5701-900-0858 | ND |
2019-05-07 | 5701-901-0858 | ND |
2019-05-07 | 5701-902-0858 | ND |
2019-05-07 | 5701-903-0858 | ND |
2019-05-07 | 5701-904-0858 | ND |
2019-05-07 | 5701-905-0858 | ND |
2019-05-07 | 5701-906-0858 | ND |
2019-05-07 | 5701-907-0858 | ND |
2019-08-06 | 5701-900-0820 | ND |
2019-08-06 | 5701-901-1000 | ND |
2019-08-06 | 5701-902-1010 | ND |
2019-08-06 | 5701-903-0745 | ND |
2019-08-06 | 5701-904-0940 | ND |
2019-08-06 | 5701-905-0800 | ND |
2019-08-06 | 5701-906-1030 | ND |
2019-08-06 | 5701-907-0835 | ND |
2019-11-05 | 5701-900-1145 | ND |
2019-11-05 | 5701-901-0915 | ND |
2019-11-05 | 5701-902-0925 | ND |
2019-11-05 | 5701-903-1125 | ND |
2019-11-05 | 5701-904-0855 | ND |
2019-11-05 | 5701-905-1130 | ND |
2019-11-05 | 5701-906-1215 | ND |
2019-11-05 | 5701-907-1200 | ND |