Bromoform
Grayslake
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 | 0.885 ppb | 16 | 16 | 0.520 ppb - 1.14 ppb |
| 2015 | 1.33 ppb | 8 | 8 | 0.820 ppb - 3.63 ppb |
| 2016 | 0.911 ppb | 8 | 8 | 0.657 ppb - 1.25 ppb |
| 2017 | 1.05 ppb | 8 | 6 | ND - 2.43 ppb |
| 2018 | 1.08 ppb | 8 | 7 | ND - 1.51 ppb |
| 2019 | 1.04 ppb | 8 | 8 | 0.733 ppb - 1.20 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 |
|---|---|---|
| 2014-02-04 | 4020652-01 | 0.612 ppb |
| 2014-02-04 | 4020652-02 | 0.520 ppb |
| 2014-02-04 | 4020652-04 | 0.810 ppb |
| 2014-02-04 | 4020652-03 | 0.875 ppb |
| 2014-05-19 | 4053319-01 | 1.12 ppb |
| 2014-05-19 | 4053319-02 | 1.14 ppb |
| 2014-05-19 | 4053319-04 | 1.07 ppb |
| 2014-05-19 | 4053319-03 | 1.03 ppb |
| 2014-08-27 | 4084873-03 | 0.969 ppb |
| 2014-08-27 | 4084873-04 | 0.965 ppb |
| 2014-08-27 | 4084873-02 | 0.990 ppb |
| 2014-08-27 | 4084873-01 | 1.08 ppb |
| 2014-11-24 | 4113394-03 | 0.554 ppb |
| 2014-11-24 | 4113394-02 | 0.596 ppb |
| 2014-11-24 | 4113394-01 | 0.808 ppb |
| 2014-11-24 | 4113394-04 | 1.03 ppb |
| 2015-02-11 | 5021957-01 | 0.820 ppb |
| 2015-02-11 | 5021957-02 | 1.41 ppb |
| 2015-05-26 | 5054002-01 | 0.904 ppb |
| 2015-05-26 | 5054002-02 | 3.63 ppb |
| 2015-08-19 | 5083682-01 | 0.853 ppb |
| 2015-08-19 | 5083682-02 | 0.935 ppb |
| 2015-11-17 | 5113125-01 | 0.869 ppb |
| 2015-11-17 | 5113125-02 | 1.21 ppb |
| 2016-02-23 | 6023683-01 | 0.961 ppb |
| 2016-02-23 | 6023683-02 | 1.25 ppb |
| 2016-05-25 | 6054135-01 | 0.823 ppb |
| 2016-05-25 | 6054135-02 | 0.893 ppb |
| 2016-08-23 | 6084890-01 | 0.677 ppb |
| 2016-08-23 | 6084890-02 | 0.657 ppb |
| 2016-11-15 | 6112784-01 | 0.828 ppb |
| 2016-11-15 | 6112784-02 | 1.20 ppb |
| 2017-02-07 | 7021680-01 | ND |
| 2017-02-07 | 7021680-02 | 0.726 ppb |
| 2017-05-30 | 7054972-01 | 0.562 ppb |
| 2017-05-30 | 7054972-02 | ND |
| 2017-08-24 | 7084529-01 | 2.43 ppb |
| 2017-08-24 | 7084529-02 | 2.40 ppb |
| 2017-11-28 | 7114316-02 | 1.37 ppb |
| 2017-11-28 | 7114316-01 | 0.951 ppb |
| 2018-02-27 | 8024175-02 | 1.51 ppb |
| 2018-02-27 | 8024175-01 | 1.45 ppb |
| 2018-05-23 | 8054247-01 | 1.09 ppb |
| 2018-05-23 | 8054247-02 | 1.10 ppb |
| 2018-08-09 | 8082450-01 | 0.947 ppb |
| 2018-08-09 | 8082450-02 | ND |
| 2018-11-12 | 8112097-01 | 1.08 ppb |
| 2018-11-12 | 8112097-02 | 1.45 ppb |
| 2019-02-18 | 9022990-01 | 0.928 ppb |
| 2019-02-18 | 9022990-02 | 1.20 ppb |
| 2019-05-06 | 9051069-01 | 1.07 ppb |
| 2019-05-06 | 9051069-02 | 1.18 ppb |
| 2019-08-12 | 9082323-01 | 1.02 ppb |
| 2019-08-12 | 9082323-02 | 0.953 ppb |
| 2019-11-11 | 9111767-01 | 1.20 ppb |
| 2019-11-21 | 9113792-01 | 0.733 ppb |