Bromoform
Winnetka
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 | 0.789 ppb | 14 | 14 | 0.519 ppb - 1.09 ppb |
| 2015 | 1.79 ppb | 8 | 8 | 0.522 ppb - 4.59 ppb |
| 2016 | 0.718 ppb | 8 | 8 | 0.520 ppb - 0.932 ppb |
| 2017 | 1.66 ppb | 8 | 7 | ND - 2.92 ppb |
| 2018 | 1.14 ppb | 14 | 14 | 0.804 ppb - 1.71 ppb |
| 2019 | 0.879 ppb | 16 | 16 | 0.573 ppb - 1.12 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 |
|---|---|---|
| 2014-01-06 | 4010828-01 | 0.519 ppb |
| 2014-01-06 | 4010828-02 | 0.566 ppb |
| 2014-01-06 | 4010828-04 | 0.703 ppb |
| 2014-01-06 | 4010828-03 | 0.559 ppb |
| 2014-04-07 | 4041896-01 | 1.08 ppb |
| 2014-04-07 | 4041896-04 | 1.09 ppb |
| 2014-04-07 | 4041896-03 | 0.936 ppb |
| 2014-04-07 | 4041896-02 | 1.02 ppb |
| 2014-07-07 | 4071808-02 | 0.812 ppb |
| 2014-07-07 | 4071808-03 | 0.662 ppb |
| 2014-07-07 | 4071808-01 | 0.782 ppb |
| 2014-07-07 | 4071808-04 | 0.913 ppb |
| 2014-10-06 | 4101800-01 | 0.690 ppb |
| 2014-10-06 | 4101800-02 | 0.730 ppb |
| 2015-01-12 | 5012083-01 | 0.548 ppb |
| 2015-01-12 | 5012083-02 | 0.632 ppb |
| 2015-04-06 | 5041679-01 | 3.31 ppb |
| 2015-04-06 | 5041679-02 | 4.59 ppb |
| 2015-07-06 | 5071692-01 | 2.10 ppb |
| 2015-07-06 | 5071692-02 | 2.01 ppb |
| 2015-10-05 | 5101455-01 | 0.522 ppb |
| 2015-10-05 | 5101455-02 | 0.615 ppb |
| 2016-01-11 | 6012071-01 | 0.530 ppb |
| 2016-01-11 | 6012071-02 | 0.573 ppb |
| 2016-04-04 | 6041283-01 | 0.696 ppb |
| 2016-04-04 | 6041283-02 | 0.764 ppb |
| 2016-07-11 | 6072595-01 | 0.899 ppb |
| 2016-07-11 | 6072595-02 | 0.932 ppb |
| 2016-10-03 | 6100650-01 | 0.826 ppb |
| 2016-10-03 | 6100650-02 | 0.520 ppb |
| 2017-01-09 | 7011952-01 | 0.672 ppb |
| 2017-01-16 | 7012474-01 | ND |
| 2017-04-03 | 7041117-01 | 0.932 ppb |
| 2017-04-03 | 7041117-02 | 0.699 ppb |
| 2017-07-10 | 7071582-01 | 2.92 ppb |
| 2017-07-10 | 7071582-02 | 2.83 ppb |
| 2017-10-02 | 7100158-02 | 2.63 ppb |
| 2017-10-02 | 7100158-01 | 2.63 ppb |
| 2018-01-08 | 8010920-02 | 0.924 ppb |
| 2018-01-08 | 8010920-01 | 1.02 ppb |
| 2018-04-02 | 8040117-02 | 1.63 ppb |
| 2018-04-02 | 8040117-01 | 1.71 ppb |
| 2018-07-02 | 8070328-02 | 0.841 ppb |
| 2018-07-02 | 8070328-01 | 0.870 ppb |
| 2018-07-30 | 8075570-04 | 1.13 ppb |
| 2018-07-30 | 8075570-03 | 1.14 ppb |
| 2018-07-30 | 8075570-02 | 0.804 ppb |
| 2018-07-30 | 8075570-01 | 0.907 ppb |
| 2018-10-01 | 8100137-04 | 1.34 ppb |
| 2018-10-01 | 8100137-03 | 1.27 ppb |
| 2018-10-01 | 8100137-02 | 1.16 ppb |
| 2018-10-01 | 8100137-01 | 1.19 ppb |
| 2019-01-08 | 9011569-04 | 0.754 ppb |
| 2019-01-08 | 9011569-03 | 0.687 ppb |
| 2019-01-08 | 9011569-02 | 0.573 ppb |
| 2019-01-08 | 9011569-01 | 0.791 ppb |
| 2019-04-02 | 9040707-04 | 0.956 ppb |
| 2019-04-02 | 9040707-03 | 0.925 ppb |
| 2019-04-02 | 9040707-02 | 0.837 ppb |
| 2019-04-02 | 9040707-01 | 0.950 ppb |
| 2019-07-08 | 9071470-04 | 1.12 ppb |
| 2019-07-08 | 9071470-03 | 1.01 ppb |
| 2019-07-08 | 9071470-02 | 0.971 ppb |
| 2019-07-08 | 9071470-01 | 1.02 ppb |
| 2019-10-07 | 9101463-01 | 0.833 ppb |
| 2019-10-07 | 9101463-03 | 0.954 ppb |
| 2019-10-07 | 9101463-02 | 0.884 ppb |
| 2019-10-07 | 9101463-04 | 0.804 ppb |