Bromoform
City of Beloit
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 | 0.263 ppb | 12 | 3 | ND - 1.70 ppb |
| 2015 | 0.338 ppb | 8 | 1 | ND - 2.70 ppb |
| 2016 | 0.272 ppb | 5 | 2 | ND - 0.720 ppb |
| 2017 | 0.413 ppb | 9 | 3 | ND - 1.90 ppb |
| 2018 | 0.765 ppb | 4 | 2 | ND - 2.10 ppb |
| 2019 | 0.503 ppb | 4 | 3 | ND - 0.940 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 |
|---|---|---|
| 2014-02-12 | 770322 | ND |
| 2014-02-26 | 772243 | ND |
| 2014-02-26 | 772270 | ND |
| 2014-02-26 | 772256 | ND |
| 2014-02-26 | 772250 | ND |
| 2014-02-26 | 772252 | ND |
| 2014-02-26 | 772259 | 0.460 ppb |
| 2014-04-09 | 779189 | ND |
| 2014-07-17 | 803882 | ND |
| 2014-07-17 | 803881 | 0.990 ppb |
| 2014-07-17 | 803880 | 1.70 ppb |
| 2014-10-20 | 826411 | ND |
| 2015-02-18 | 844273 | ND |
| 2015-02-18 | 844274 | ND |
| 2015-02-18 | 844275 | ND |
| 2015-04-29 | 857820 | ND |
| 2015-07-08 | 869710 | ND |
| 2015-07-08 | 869708 | ND |
| 2015-07-08 | 869709 | 2.70 ppb |
| 2015-10-14 | 889091 | ND |
| 2016-02-10 | 905181 | ND |
| 2016-02-10 | 905180 | ND |
| 2016-02-10 | 905182 | ND |
| 2016-07-27 | 935754 | 0.640 ppb |
| 2016-07-27 | 935755 | 0.720 ppb |
| 2017-02-28 | 975341 | ND |
| 2017-02-28 | 975355 | ND |
| 2017-02-28 | 975344 | ND |
| 2017-02-28 | 975351 | ND |
| 2017-02-28 | 975337 | ND |
| 2017-02-28 | 975347 | ND |
| 2017-02-28 | 975334 | 0.420 ppb |
| 2017-09-06 | 1016227 | 1.40 ppb |
| 2017-09-06 | 1016226 | 1.90 ppb |
| 2018-03-07 | 1044056 | ND |
| 2018-03-07 | 1044054 | ND |
| 2018-09-12 | 1079852 | 0.960 ppb |
| 2018-09-12 | 1079867 | 2.10 ppb |
| 2019-06-26 | 1130747 | ND |
| 2019-06-26 | 1130749 | 0.310 ppb |
| 2019-09-18 | 1149342 | 0.760 ppb |
| 2019-09-18 | 1149343 | 0.940 ppb |