Bromodichloromethane
Western Municipal 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.
168
Samples
0
Samples exceeding legal limit (MCL)
159
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 | 3.33 ppb | 8 | 8 | 3.10 ppb - 3.40 ppb |
| 2015 | 3.12 ppb | 40 | 37 | ND - 7.40 ppb |
| 2016 | 3.33 ppb | 32 | 32 | 0.620 ppb - 7.90 ppb |
| 2017 | 4.75 ppb | 24 | 22 | ND - 9.30 ppb |
| 2018 | 3.72 ppb | 32 | 29 | ND - 6.60 ppb |
| 2019 | 5.43 ppb | 32 | 31 | ND - 15.0 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 |
|---|---|---|
| 2014-08-06 | 4790-011-1420 | 3.40 ppb |
| 2014-08-06 | 4790-012-1245 | 3.10 ppb |
| 2014-08-06 | 4790-013-1530 | 3.30 ppb |
| 2014-08-06 | 4790-014-1145 | 3.40 ppb |
| 2014-08-06 | 4790-015-1345 | 3.30 ppb |
| 2014-08-06 | 4790-016-1040 | 3.40 ppb |
| 2014-08-06 | 4790-017-0935 | 3.30 ppb |
| 2014-08-06 | 4790-018-1010 | 3.40 ppb |
| 2015-02-04 | 4790-011-0905 | 2.60 ppb |
| 2015-02-04 | 4790-012-1020 | 5.00 ppb |
| 2015-02-04 | 4790-013-1450 | 4.90 ppb |
| 2015-02-04 | 4790-014-1100 | 4.70 ppb |
| 2015-02-04 | 4790-015-0930 | 2.30 ppb |
| 2015-02-04 | 4790-016-1310 | 4.00 ppb |
| 2015-02-04 | 4790-017-1235 | 1.90 ppb |
| 2015-02-04 | 4790-018-1350 | 3.90 ppb |
| 2015-03-05 | 4790-011-1115 | 1.20 ppb |
| 2015-03-05 | 4790-012-0930 | 3.50 ppb |
| 2015-03-05 | 4790-013-1410 | 2.40 ppb |
| 2015-03-05 | 4790-014-1015 | 2.40 ppb |
| 2015-03-05 | 4790-015-1055 | 1.20 ppb |
| 2015-03-05 | 4790-016-1335 | 3.10 ppb |
| 2015-03-05 | 4790-017-1150 | 1.90 ppb |
| 2015-03-05 | 4790-018-1320 | 3.20 ppb |
| 2015-05-06 | 4790-011-1245 | 0.510 ppb |
| 2015-05-06 | 4790-012-1100 | 2.80 ppb |
| 2015-05-06 | 4790-013-1345 | 3.50 ppb |
| 2015-05-06 | 4790-014-1140 | 2.70 ppb |
| 2015-05-06 | 4790-015-1220 | 0.500 ppb |
| 2015-05-06 | 4790-016-1315 | 2.60 ppb |
| 2015-05-06 | 4790-017-0950 | 1.40 ppb |
| 2015-05-06 | 4790-018-1015 | 2.80 ppb |
| 2015-08-06 | 4790-011-1435 | 0.630 ppb |
| 2015-08-06 | 4790-012-1255 | 6.60 ppb |
| 2015-08-06 | 4790-013-1515 | 7.40 ppb |
| 2015-08-06 | 4790-014-1345 | 6.80 ppb |
| 2015-08-06 | 4790-015-1415 | 0.710 ppb |
| 2015-08-06 | 4790-016-1025 | 6.40 ppb |
| 2015-08-06 | 4790-017-1055 | 7.10 ppb |
| 2015-08-06 | 4790-018-0955 | 6.40 ppb |
| 2015-11-05 | 4790-011-1050 | ND |
| 2015-11-05 | 4790-012-0945 | 3.80 ppb |
| 2015-11-05 | 4790-013-1230 | 4.50 ppb |
| 2015-11-05 | 4790-014-0900 | 3.80 ppb |
| 2015-11-05 | 4790-015-1030 | ND |
| 2015-11-05 | 4790-016-1115 | 3.00 ppb |
| 2015-11-05 | 4790-017-1200 | ND |
| 2015-11-05 | 4790-018-1130 | 2.70 ppb |
| 2016-02-02 | 4790-011-1100 | 0.740 ppb |
| 2016-02-02 | 4790-012-0900 | 2.70 ppb |
| 2016-02-02 | 4790-013-1440 | 2.40 ppb |
| 2016-02-02 | 4790-014-0940 | 2.10 ppb |
| 2016-02-02 | 4790-015-1030 | 0.680 ppb |
| 2016-02-02 | 4790-016-1415 | 1.60 ppb |
| 2016-02-02 | 4790-017-1340 | 0.840 ppb |
| 2016-02-02 | 4790-018-1400 | 1.60 ppb |
| 2016-05-04 | 4790-011-0850 | 0.910 ppb |
| 2016-05-04 | 4790-012-0815 | 7.10 ppb |
| 2016-05-04 | 4790-013-1120 | 7.90 ppb |
| 2016-05-04 | 4790-014-0730 | 6.90 ppb |
| 2016-05-04 | 4790-015-0910 | 0.860 ppb |
| 2016-05-04 | 4790-016-0935 | 3.30 ppb |
| 2016-05-04 | 4790-017-1040 | 1.90 ppb |
| 2016-05-04 | 4790-018-1000 | 3.50 ppb |
| 2016-08-03 | 4790-011-1155 | 1.000 ppb |
| 2016-08-03 | 4790-012-1050 | 5.60 ppb |
| 2016-08-03 | 4790-013-1430 | 7.30 ppb |
| 2016-08-03 | 4790-014-0930 | 5.80 ppb |
| 2016-08-03 | 4790-015-1130 | 0.840 ppb |
| 2016-08-03 | 4790-016-1340 | 7.30 ppb |
| 2016-08-03 | 4790-017-1240 | 5.80 ppb |
| 2016-08-03 | 4790-018-1315 | 6.60 ppb |
| 2016-11-03 | 4790-011-1520 | 0.640 ppb |
| 2016-11-03 | 4790-012-1400 | 5.10 ppb |
| 2016-11-03 | 4790-013-0950 | 4.50 ppb |
| 2016-11-03 | 4790-014-1430 | 4.40 ppb |
| 2016-11-03 | 4790-015-1500 | 0.620 ppb |
| 2016-11-03 | 4790-016-1050 | 2.70 ppb |
| 2016-11-03 | 4790-017-1140 | 0.620 ppb |
| 2016-11-03 | 4790-018-1115 | 2.60 ppb |
| 2017-05-04 | 4790-011-0820 | 0.670 ppb |
| 2017-05-04 | 4790-012-1040 | 8.90 ppb |
| 2017-05-04 | 4790-013-1330 | 9.30 ppb |
| 2017-05-04 | 4790-014-0955 | 8.40 ppb |
| 2017-05-04 | 4790-015-0855 | 1.10 ppb |
| 2017-05-04 | 4790-016-1250 | 7.70 ppb |
| 2017-05-04 | 4790-017-1200 | 8.30 ppb |
| 2017-05-04 | 4790-018-1230 | 7.90 ppb |
| 2017-08-02 | 4790-011-0850 | ND |
| 2017-08-02 | 4790-012-1040 | 5.20 ppb |
| 2017-08-02 | 4790-013-1340 | 7.60 ppb |
| 2017-08-02 | 4790-014-0955 | 5.20 ppb |
| 2017-08-02 | 4790-015-0915 | 0.500 ppb |
| 2017-08-02 | 4790-016-1240 | 7.00 ppb |
| 2017-08-02 | 4790-017-1115 | 1.10 ppb |
| 2017-08-02 | 4790-018-1205 | 4.60 ppb |
| 2017-11-01 | 4790-011-0810 | 0.650 ppb |
| 2017-11-01 | 4790-012-1010 | 4.70 ppb |
| 2017-11-01 | 4790-013-1235 | 5.70 ppb |
| 2017-11-01 | 4790-014-0925 | 4.90 ppb |
| 2017-11-01 | 4790-015-0845 | ND |
| 2017-11-01 | 4790-016-1210 | 4.80 ppb |
| 2017-11-01 | 4790-017-1120 | 4.70 ppb |
| 2017-11-01 | 4790-018-1145 | 5.00 ppb |
| 2018-02-07 | 4790-011-0715 | 1.000 ppb |
| 2018-02-07 | 4790-012-0910 | 5.70 ppb |
| 2018-02-07 | 4790-013-1220 | 5.40 ppb |
| 2018-02-07 | 4790-014-0830 | 5.70 ppb |
| 2018-02-07 | 4790-015-0745 | 0.630 ppb |
| 2018-02-07 | 4790-016-1110 | 3.40 ppb |
| 2018-02-07 | 4790-017-1000 | 1.000 ppb |
| 2018-02-07 | 4790-018-1040 | 3.80 ppb |
| 2018-05-02 | 4790-011-0710 | 0.610 ppb |
| 2018-05-02 | 4790-012-0855 | 5.00 ppb |
| 2018-05-02 | 4790-013-1135 | 6.60 ppb |
| 2018-05-02 | 4790-014-0815 | 4.90 ppb |
| 2018-05-02 | 4790-015-0735 | 0.580 ppb |
| 2018-05-02 | 4790-016-1050 | 5.60 ppb |
| 2018-05-02 | 4790-017-1000 | 5.20 ppb |
| 2018-05-02 | 4790-018-1030 | 5.80 ppb |
| 2018-08-01 | 4790-011-0830 | 4.80 ppb |
| 2018-08-01 | 4790-012-1020 | 4.40 ppb |
| 2018-08-01 | 4790-013-1240 | 5.10 ppb |
| 2018-08-01 | 4790-014-0930 | 4.90 ppb |
| 2018-08-01 | 4790-015-0850 | 5.00 ppb |
| 2018-08-01 | 4790-016-1200 | 4.10 ppb |
| 2018-08-01 | 4790-017-1100 | 4.10 ppb |
| 2018-08-01 | 4790-018-1140 | 4.20 ppb |
| 2018-11-01 | 4790-011-0835 | ND |
| 2018-11-01 | 4790-012-1020 | 5.00 ppb |
| 2018-11-01 | 4790-013-1450 | 5.00 ppb |
| 2018-11-01 | 4790-014-0935 | 4.70 ppb |
| 2018-11-01 | 4790-015-0900 | ND |
| 2018-11-01 | 4790-016-1425 | 3.50 ppb |
| 2018-11-01 | 4790-017-1215 | ND |
| 2018-11-01 | 4790-018-1410 | 3.40 ppb |
| 2019-02-07 | 4790-011-0945 | 1.40 ppb |
| 2019-02-07 | 4790-012-1145 | 8.90 ppb |
| 2019-02-07 | 4790-013-1325 | 1.20 ppb |
| 2019-02-07 | 4790-014-1035 | 6.60 ppb |
| 2019-02-07 | 4790-015-1000 | 1.40 ppb |
| 2019-02-07 | 4790-016-1300 | 1.50 ppb |
| 2019-02-07 | 4790-017-1215 | 1.10 ppb |
| 2019-02-07 | 4790-018-1240 | 1.40 ppb |
| 2019-05-09 | 4790-011-0805 | 7.60 ppb |
| 2019-05-09 | 4790-012-1010 | 6.20 ppb |
| 2019-05-09 | 4790-013-1405 | 6.60 ppb |
| 2019-05-09 | 4790-014-0915 | 6.30 ppb |
| 2019-05-09 | 4790-015-0820 | 4.70 ppb |
| 2019-05-09 | 4790-016-1305 | 6.20 ppb |
| 2019-05-09 | 4790-017-1135 | 2.10 ppb |
| 2019-05-09 | 4790-018-1250 | 6.60 ppb |
| 2019-08-07 | 4790-011-0800 | 3.60 ppb |
| 2019-08-07 | 4790-012-0930 | 9.20 ppb |
| 2019-08-07 | 4790-013-1350 | 14.0 ppb |
| 2019-08-07 | 4790-014-0900 | 14.0 ppb |
| 2019-08-07 | 4790-015-0820 | 5.10 ppb |
| 2019-08-07 | 4790-016-1320 | 10.00 ppb |
| 2019-08-07 | 4790-017-1130 | 15.0 ppb |
| 2019-08-07 | 4790-018-1305 | 9.80 ppb |
| 2019-11-06 | 4790-011-1015 | 1.10 ppb |
| 2019-11-06 | 4790-012-1140 | 4.00 ppb |
| 2019-11-06 | 4790-013-1355 | 3.90 ppb |
| 2019-11-06 | 4790-014-1105 | 3.60 ppb |
| 2019-11-06 | 4790-015-1000 | ND |
| 2019-11-06 | 4790-016-1245 | 3.60 ppb |
| 2019-11-06 | 4790-017-1205 | 3.40 ppb |
| 2019-11-06 | 4790-018-1230 | 3.60 ppb |