Bromoform
Cudahy Waterworks
Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Samples
Samples exceeding legal limit (MCL)
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 | 1.11 ppb | 9 | 9 | 0.840 ppb - 1.90 ppb |
| 2015 | 1.15 ppb | 9 | 9 | 0.830 ppb - 1.90 ppb |
| 2016 | 0.914 ppb | 9 | 9 | 0.630 ppb - 1.30 ppb |
| 2017 | 0.702 ppb | 9 | 7 | ND - 1.40 ppb |
| 2018 | 0.932 ppb | 9 | 9 | 0.630 ppb - 1.70 ppb |
| 2019 | 0.941 ppb | 9 | 9 | 0.620 ppb - 1.50 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.5 ppb
The EWG Health Guideline of 0.5 ppb for bromoform 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 |
|---|---|---|
| 2014-02-24 | 772011 | 0.870 ppb |
| 2014-02-24 | 772010 | 0.890 ppb |
| 2014-05-20 | 790650 | 0.870 ppb |
| 2014-05-20 | 790651 | 0.840 ppb |
| 2014-06-26 | 799757 | 1.20 ppb |
| 2014-08-18 | 811211 | 1.70 ppb |
| 2014-08-18 | 811210 | 1.90 ppb |
| 2014-11-17 | 831794 | 0.850 ppb |
| 2014-11-17 | 831793 | 0.860 ppb |
| 2015-02-15 | 843787 | 0.930 ppb |
| 2015-02-24 | 845018 | 1.20 ppb |
| 2015-02-24 | 845019 | 1.20 ppb |
| 2015-05-20 | 860837 | 0.830 ppb |
| 2015-05-20 | 860838 | 0.850 ppb |
| 2015-08-25 | 878708 | 1.30 ppb |
| 2015-08-25 | 878707 | 1.90 ppb |
| 2015-11-17 | 894516 | 1.30 ppb |
| 2015-11-17 | 894515 | 0.840 ppb |
| 2016-02-10 | 904994 | 0.630 ppb |
| 2016-02-23 | 906548 | 0.850 ppb |
| 2016-02-23 | 906547 | 0.910 ppb |
| 2016-05-24 | 922711 | 0.680 ppb |
| 2016-05-24 | 922710 | 0.690 ppb |
| 2016-08-17 | 940105 | 0.870 ppb |
| 2016-08-17 | 940106 | 1.20 ppb |
| 2016-11-15 | 959230 | 1.10 ppb |
| 2016-11-15 | 959231 | 1.30 ppb |
| 2017-02-20 | 974380 | 1.20 ppb |
| 2017-02-20 | 974379 | 1.20 ppb |
| 2017-04-05 | 981444 | ND |
| 2017-05-23 | 993433 | ND |
| 2017-05-23 | 993434 | 0.610 ppb |
| 2017-08-21 | 1012927 | 0.500 ppb |
| 2017-08-21 | 1012928 | 0.620 ppb |
| 2017-11-16 | 1030315 | 0.790 ppb |
| 2017-11-16 | 1030316 | 1.40 ppb |
| 2018-02-20 | 1041819 | 0.650 ppb |
| 2018-02-20 | 1041818 | 0.710 ppb |
| 2018-04-09 | 1049183 | 0.630 ppb |
| 2018-05-22 | 1057153 | 0.870 ppb |
| 2018-05-22 | 1057154 | 0.920 ppb |
| 2018-08-20 | 1074901 | 1.70 ppb |
| 2018-08-20 | 1074900 | 1.60 ppb |
| 2018-11-19 | 1093614 | 0.660 ppb |
| 2018-11-19 | 1093615 | 0.650 ppb |
| 2019-02-19 | 1105863 | 0.880 ppb |
| 2019-02-19 | 1105864 | 0.890 ppb |
| 2019-04-02 | 1112693 | 0.630 ppb |
| 2019-05-21 | 1122294 | 0.620 ppb |
| 2019-05-21 | 1122295 | 0.670 ppb |
| 2019-08-19 | 1141911 | 0.980 ppb |
| 2019-08-19 | 1141910 | 1.10 ppb |
| 2019-11-20 | 1161834 | 1.20 ppb |
| 2019-11-20 | 1161835 | 1.50 ppb |