Bromoform
Round Lake Beach
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 | 1.02 ppb | 16 | 16 | 0.692 ppb - 1.42 ppb |
| 2015 | 1.60 ppb | 8 | 8 | 0.707 ppb - 3.41 ppb |
| 2016 | 0.748 ppb | 8 | 6 | ND - 1.11 ppb |
| 2017 | 1.68 ppb | 8 | 8 | 0.505 ppb - 2.92 ppb |
| 2018 | 1.12 ppb | 8 | 8 | 0.880 ppb - 1.52 ppb |
| 2019 | 1.03 ppb | 8 | 8 | 0.843 ppb - 1.17 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 | 4012034-01 | 1.10 ppb |
| 2014-01-14 | 4012034-02 | 0.692 ppb |
| 2014-01-14 | 4012034-04 | 0.806 ppb |
| 2014-01-14 | 4012034-03 | 0.867 ppb |
| 2014-04-22 | 4043717-01 | 1.32 ppb |
| 2014-04-22 | 4043717-02 | 1.42 ppb |
| 2014-04-22 | 4043717-04 | 1.12 ppb |
| 2014-04-22 | 4043717-03 | 1.28 ppb |
| 2014-07-24 | 4074636-03 | 1.16 ppb |
| 2014-07-24 | 4074636-04 | 0.870 ppb |
| 2014-07-24 | 4074636-02 | 1.14 ppb |
| 2014-07-24 | 4074636-01 | 1.02 ppb |
| 2014-10-23 | 4103672-03 | 0.843 ppb |
| 2014-10-23 | 4103672-02 | 0.985 ppb |
| 2014-10-23 | 4103672-01 | 0.818 ppb |
| 2014-10-23 | 4103672-04 | 0.838 ppb |
| 2015-01-12 | 5012102-01 | 0.707 ppb |
| 2015-01-12 | 5012102-02 | 0.823 ppb |
| 2015-04-20 | 5043653-01 | 1.90 ppb |
| 2015-04-20 | 5043653-02 | 3.41 ppb |
| 2015-07-06 | 5071683-01 | 2.13 ppb |
| 2015-07-06 | 5071683-02 | 2.22 ppb |
| 2015-10-05 | 5101396-01 | 0.781 ppb |
| 2015-10-05 | 5101396-02 | 0.857 ppb |
| 2016-01-25 | 6013748-01 | ND |
| 2016-01-25 | 6013748-02 | ND |
| 2016-04-18 | 6043489-01 | 0.981 ppb |
| 2016-04-18 | 6043489-02 | 1.11 ppb |
| 2016-07-06 | 6071111-01 | 0.963 ppb |
| 2016-07-06 | 6071111-02 | 1.04 ppb |
| 2016-10-17 | 6102825-01 | 0.904 ppb |
| 2016-10-17 | 6102825-02 | 0.984 ppb |
| 2017-01-13 | 7012247-01 | 0.505 ppb |
| 2017-01-13 | 7012247-02 | 0.554 ppb |
| 2017-04-03 | 7041090-01 | 0.602 ppb |
| 2017-04-03 | 7041090-02 | 0.628 ppb |
| 2017-07-10 | 7071785-01 | 2.87 ppb |
| 2017-07-10 | 7071785-02 | 2.92 ppb |
| 2017-10-19 | 7103436-02 | 2.80 ppb |
| 2017-10-19 | 7103436-01 | 2.60 ppb |
| 2018-01-10 | 8011393-02 | 1.05 ppb |
| 2018-01-10 | 8011393-01 | 0.880 ppb |
| 2018-04-24 | 8044064-01 | 0.985 ppb |
| 2018-04-24 | 8044064-02 | 1.35 ppb |
| 2018-07-30 | 8075366-01 | 0.894 ppb |
| 2018-07-30 | 8075366-02 | 0.900 ppb |
| 2018-10-23 | 8104381-01 | 1.39 ppb |
| 2018-10-23 | 8104381-02 | 1.52 ppb |
| 2019-01-08 | 9011225-01 | 0.843 ppb |
| 2019-01-08 | 9011225-02 | 1.02 ppb |
| 2019-04-16 | 9043666-01 | 1.04 ppb |
| 2019-04-16 | 9043666-02 | 1.17 ppb |
| 2019-07-09 | 9071521-01 | 1.04 ppb |
| 2019-07-09 | 9071521-02 | 1.11 ppb |
| 2019-10-08 | 9101509-02 | 0.971 ppb |
| 2019-10-08 | 9101509-01 | 1.06 ppb |