Bromoform
City of South Sioux City
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 |
|---|---|---|---|---|
| 2014 | 0.958 ppb | 18 | 14 | ND - 2.28 ppb |
| 2015 | 0.755 ppb | 15 | 10 | ND - 1.71 ppb |
| 2016 | 1.18 ppb | 9 | 8 | ND - 1.94 ppb |
| 2017 | 0.907 ppb | 10 | 8 | ND - 1.85 ppb |
| 2018 | 0.969 ppb | 9 | 7 | ND - 1.77 ppb |
| 2019 | 0.798 ppb | 9 | 8 | ND - 1.37 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 |
|---|---|---|
| 2014-01-14 | 283269 | 0.590 ppb |
| 2014-01-14 | 283268 | 0.940 ppb |
| 2014-01-14 | 283267 | 1.01 ppb |
| 2014-01-14 | 283266 | 0.660 ppb |
| 2014-01-21 | 279073 | 0.990 ppb |
| 2014-04-14 | 294676 | 1.12 ppb |
| 2014-04-14 | 294679 | 1.21 ppb |
| 2014-04-14 | 294677 | 1.38 ppb |
| 2014-04-14 | 294678 | 1.41 ppb |
| 2014-07-14 | 311916 | ND |
| 2014-07-14 | 311917 | ND |
| 2014-07-14 | 311918 | 0.525 ppb |
| 2014-07-14 | 311919 | ND |
| 2014-10-15 | 330666 | 1.51 ppb |
| 2014-10-15 | 330669 | 1.47 ppb |
| 2014-10-15 | 330668 | 2.28 ppb |
| 2014-10-15 | 330667 | 2.15 ppb |
| 2014-11-12 | 328540 | ND |
| 2015-01-12 | 344869 | 0.934 ppb |
| 2015-01-12 | 344866 | 0.789 ppb |
| 2015-01-12 | 344867 | 1.24 ppb |
| 2015-01-12 | 344868 | 1.27 ppb |
| 2015-04-13 | 357461 | 1.15 ppb |
| 2015-04-13 | 357462 | 0.945 ppb |
| 2015-04-13 | 357460 | 1.29 ppb |
| 2015-04-13 | 357459 | 0.918 ppb |
| 2015-07-13 | 374500 | ND |
| 2015-07-13 | 374501 | ND |
| 2015-07-13 | 374502 | ND |
| 2015-07-13 | 374503 | ND |
| 2015-10-13 | 393505 | 1.08 ppb |
| 2015-10-13 | 393506 | 1.71 ppb |
| 2015-10-19 | 391673 | ND |
| 2016-01-12 | 1.49 ppb | |
| 2016-01-12 | 1.18 ppb | |
| 2016-04-11 | 1.36 ppb | |
| 2016-04-11 | 1.94 ppb | |
| 2016-07-12 | 1.05 ppb | |
| 2016-07-12 | 1.53 ppb | |
| 2016-10-11 | 1.05 ppb | |
| 2016-10-11 | 0.980 ppb | |
| 2016-10-18 | ND | |
| 2017-01-09 | 1.32 ppb | |
| 2017-01-09 | 1.46 ppb | |
| 2017-01-23 | ND | |
| 2017-04-10 | 1.12 ppb | |
| 2017-04-10 | 0.945 ppb | |
| 2017-07-10 | 1.03 ppb | |
| 2017-07-10 | 0.840 ppb | |
| 2017-10-10 | 1.85 ppb | |
| 2017-10-10 | 0.500 ppb | |
| 2017-11-13 | ND | |
| 2018-01-09 | 532072 | 1.24 ppb |
| 2018-01-09 | 532071 | 1.34 ppb |
| 2018-04-09 | 543809 | 1.77 ppb |
| 2018-04-09 | 543810 | ND |
| 2018-07-09 | 561585 | 0.560 ppb |
| 2018-07-09 | 561586 | 0.980 ppb |
| 2018-10-10 | 578333 | 1.39 ppb |
| 2018-10-10 | 578334 | 1.44 ppb |
| 2018-10-22 | 577075 | ND |
| 2019-01-07 | 590605 | 0.660 ppb |
| 2019-01-07 | 590606 | 1.14 ppb |
| 2019-04-08 | 600524 | 0.770 ppb |
| 2019-04-08 | 600525 | 1.20 ppb |
| 2019-07-08 | 622408 | 1.37 ppb |
| 2019-07-08 | 622409 | 0.600 ppb |
| 2019-10-15 | 638233 | 0.830 ppb |
| 2019-10-15 | 638232 | 0.610 ppb |
| 2019-10-21 | 638444 | ND |