Bromodichloromethane
City of California City
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.
106
Samples
0
Samples exceeding legal limit (MCL)
39
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 0.355 ppb | 21 | 4 | ND - 3.20 ppb |
| 2015 | 1.53 ppb | 16 | 15 | ND - 3.30 ppb |
| 2016 | 0.226 ppb | 17 | 4 | ND - 1.30 ppb |
| 2017 | 0.160 ppb | 21 | 5 | ND - 0.910 ppb |
| 2018 | 0.274 ppb | 16 | 5 | ND - 1.50 ppb |
| 2019 | 0.664 ppb | 15 | 6 | ND - 6.20 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 |
|---|---|---|
| 2014-03-19 | 5806-901-0720 | 3.20 ppb |
| 2014-03-19 | 5806-902-0740 | ND |
| 2014-03-19 | 5806-903-0640 | ND |
| 2014-03-19 | 5806-904-0700 | ND |
| 2014-06-26 | 5806-901-0740 | 1.60 ppb |
| 2014-06-26 | 5806-902-0725 | ND |
| 2014-06-26 | 5806-903-0645 | ND |
| 2014-06-26 | 5806-904-0705 | ND |
| 2014-08-25 | 5806-005-1400 | ND |
| 2014-08-25 | 5806-006-1320 | ND |
| 2014-08-25 | 5806-008-1345 | ND |
| 2014-08-25 | 5806-009-1310 | ND |
| 2014-08-25 | 5806-016-1335 | ND |
| 2014-09-24 | 5806-901-0750 | 2.00 ppb |
| 2014-09-24 | 5806-902-0730 | ND |
| 2014-09-24 | 5806-903-0645 | ND |
| 2014-09-24 | 5806-904-0710 | ND |
| 2014-12-17 | 5806-901-1000 | 0.660 ppb |
| 2014-12-17 | 5806-902-0930 | ND |
| 2014-12-17 | 5806-903-0845 | ND |
| 2014-12-17 | 5806-904-0910 | ND |
| 2015-03-25 | 5806-901-0910 | ND |
| 2015-03-25 | 5806-902-0845 | 0.720 ppb |
| 2015-03-25 | 5806-903-0800 | 0.660 ppb |
| 2015-03-25 | 5806-904-0825 | 0.680 ppb |
| 2015-06-25 | 5806-901-0750 | 0.870 ppb |
| 2015-06-25 | 5806-902-0815 | 0.970 ppb |
| 2015-06-25 | 5806-903-0840 | 1.10 ppb |
| 2015-06-25 | 5806-904-0730 | 0.920 ppb |
| 2015-09-23 | 5806-901-1510 | 1.20 ppb |
| 2015-09-23 | 5806-902-1440 | 3.30 ppb |
| 2015-09-23 | 5806-903-1400 | 3.30 ppb |
| 2015-09-23 | 5806-904-1420 | 3.30 ppb |
| 2015-12-15 | 5806-901-1130 | 1.40 ppb |
| 2015-12-15 | 5806-902-1115 | 1.40 ppb |
| 2015-12-15 | 5806-903-1035 | 2.10 ppb |
| 2015-12-15 | 5806-904-1055 | 2.50 ppb |
| 2016-03-17 | 5806-901-1125 | 0.900 ppb |
| 2016-03-17 | 5806-902-1145 | ND |
| 2016-03-17 | 5806-903-1040 | ND |
| 2016-03-17 | 5806-904-1100 | ND |
| 2016-06-14 | 5806-901-0915 | ND |
| 2016-06-14 | 5806-902-0940 | ND |
| 2016-06-14 | 5806-903-0850 | ND |
| 2016-06-14 | 5806-904-1005 | ND |
| 2016-09-28 | 5806-901-0955 | 1.30 ppb |
| 2016-09-28 | 5806-902-1015 | ND |
| 2016-09-28 | 5806-903-0930 | ND |
| 2016-09-28 | 5806-904-1040 | ND |
| 2016-12-15 | 5806-003-0920 | 0.680 ppb |
| 2016-12-20 | 5806-901-0915 | 0.960 ppb |
| 2016-12-20 | 5806-902-0850 | ND |
| 2016-12-20 | 5806-903-0810 | ND |
| 2016-12-20 | 5806-904-0835 | ND |
| 2017-03-09 | 5806-901-1400 | 0.910 ppb |
| 2017-03-09 | 5806-902-1335 | ND |
| 2017-03-09 | 5806-903-1300 | ND |
| 2017-03-09 | 5806-904-1320 | ND |
| 2017-06-19 | 5806-901-1045 | 0.560 ppb |
| 2017-06-19 | 5806-902-1105 | ND |
| 2017-06-19 | 5806-903-1025 | ND |
| 2017-06-19 | 5806-904-1135 | ND |
| 2017-08-01 | 5806-005-1100 | ND |
| 2017-08-01 | 5806-006-1135 | ND |
| 2017-08-01 | 5806-008-1000 | ND |
| 2017-08-01 | 5806-009-1030 | ND |
| 2017-08-01 | 5806-016-0925 | ND |
| 2017-09-25 | 5806-901-1220 | 0.690 ppb |
| 2017-09-25 | 5806-902-1250 | ND |
| 2017-09-25 | 5806-903-1120 | ND |
| 2017-09-25 | 5806-904-1145 | ND |
| 2017-12-19 | 5806-901-1500 | 0.700 ppb |
| 2017-12-19 | 5806-902-1440 | 0.510 ppb |
| 2017-12-19 | 5806-903-1420 | ND |
| 2017-12-19 | 5806-904-1520 | ND |
| 2018-02-14 | 5806-901-0915 | 0.730 ppb |
| 2018-02-14 | 5806-902-0940 | 0.760 ppb |
| 2018-02-14 | 5806-903-0840 | ND |
| 2018-02-14 | 5806-904-0900 | ND |
| 2018-05-24 | 5806-901-1100 | 0.510 ppb |
| 2018-05-24 | 5806-902-1120 | ND |
| 2018-05-24 | 5806-903-1025 | ND |
| 2018-05-24 | 5806-904-1040 | ND |
| 2018-08-22 | 5806-901-1400 | 1.50 ppb |
| 2018-08-22 | 5806-902-1340 | ND |
| 2018-08-22 | 5806-903-1300 | ND |
| 2018-08-22 | 5806-904-1325 | ND |
| 2018-11-15 | 5806-901-1045 | 0.880 ppb |
| 2018-11-15 | 5806-902-1115 | ND |
| 2018-11-15 | 5806-903-1200 | ND |
| 2018-11-15 | 5806-904-1135 | ND |
| 2019-02-07 | 5806-901-1215 | 0.910 ppb |
| 2019-02-07 | 5806-902-1200 | 0.580 ppb |
| 2019-02-07 | 5806-903-1110 | ND |
| 2019-02-07 | 5806-904-1335 | 0.550 ppb |
| 2019-05-15 | 5806-901-1028 | ND |
| 2019-05-15 | 5806-902-0935 | ND |
| 2019-05-15 | 5806-903-1050 | ND |
| 2019-05-15 | 5806-904-1005 | ND |
| 2019-08-22 | 5806-901-1245 | 1.000 ppb |
| 2019-08-22 | 5806-902-1305 | ND |
| 2019-08-22 | 5806-903-1210 | ND |
| 2019-08-22 | 5806-904-1225 | ND |
| 2019-11-18 | 5806-901-1115 | 6.20 ppb |
| 2019-11-18 | 5806-903-1030 | 0.720 ppb |
| 2019-11-19 | 5806-003-1000 | ND |