Bromoform
Ashwaubenon Waterworks
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 | 0.525 ppb | 11 | 7 | ND - 1.10 ppb |
| 2015 | 0.689 ppb | 8 | 8 | 0.500 ppb - 1.000 ppb |
| 2016 | 0.768 ppb | 8 | 8 | 0.580 ppb - 0.990 ppb |
| 2017 | 0.970 ppb | 8 | 8 | 0.760 ppb - 1.30 ppb |
| 2018 | 0.739 ppb | 8 | 8 | 0.500 ppb - 0.960 ppb |
| 2019 | 0.664 ppb | 8 | 8 | 0.460 ppb - 0.910 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 |
|---|---|---|
| 2014-02-03 | 768764 | 0.770 ppb |
| 2014-02-03 | 768765 | 0.710 ppb |
| 2014-03-17 | 774968 | ND |
| 2014-03-17 | 774973 | ND |
| 2014-03-17 | 774976 | ND |
| 2014-05-05 | 783835 | 0.750 ppb |
| 2014-05-05 | 783834 | 0.650 ppb |
| 2014-08-04 | 807946 | 1.10 ppb |
| 2014-08-04 | 807947 | 1.10 ppb |
| 2014-11-03 | 829268 | ND |
| 2014-11-03 | 829269 | 0.690 ppb |
| 2015-02-03 | 841723 | 0.800 ppb |
| 2015-02-03 | 841722 | 1.000 ppb |
| 2015-05-04 | 857818 | 0.500 ppb |
| 2015-05-04 | 857819 | 0.550 ppb |
| 2015-08-06 | 875688 | 0.550 ppb |
| 2015-08-06 | 875689 | 0.570 ppb |
| 2015-11-02 | 892162 | 0.700 ppb |
| 2015-11-02 | 892161 | 0.840 ppb |
| 2016-02-08 | 904454 | 0.580 ppb |
| 2016-02-08 | 904455 | 0.730 ppb |
| 2016-05-09 | 920138 | 0.620 ppb |
| 2016-05-09 | 920137 | 0.750 ppb |
| 2016-08-01 | 936389 | 0.720 ppb |
| 2016-08-01 | 936390 | 0.810 ppb |
| 2016-10-31 | 956457 | 0.940 ppb |
| 2016-10-31 | 956456 | 0.990 ppb |
| 2017-02-06 | 972438 | 1.000 ppb |
| 2017-02-06 | 972439 | 1.30 ppb |
| 2017-05-08 | 987145 | 0.760 ppb |
| 2017-05-08 | 987146 | 0.840 ppb |
| 2017-08-07 | 1009164 | 0.930 ppb |
| 2017-08-07 | 1009165 | 0.970 ppb |
| 2017-11-06 | 1028142 | 0.960 ppb |
| 2017-11-06 | 1028143 | 1.000 ppb |
| 2018-02-06 | 1039775 | 0.740 ppb |
| 2018-02-06 | 1039774 | 0.620 ppb |
| 2018-05-07 | 1054110 | 0.530 ppb |
| 2018-05-07 | 1054111 | 0.500 ppb |
| 2018-08-06 | 1071728 | 0.930 ppb |
| 2018-08-06 | 1071727 | 0.960 ppb |
| 2018-11-05 | 1091027 | 0.750 ppb |
| 2018-11-05 | 1091028 | 0.880 ppb |
| 2019-02-04 | 1103519 | 0.530 ppb |
| 2019-02-04 | 1103520 | 0.620 ppb |
| 2019-05-06 | 1119156 | 0.460 ppb |
| 2019-05-06 | 1119157 | 0.470 ppb |
| 2019-08-05 | 1138429 | 0.720 ppb |
| 2019-08-05 | 1138430 | 0.910 ppb |
| 2019-11-04 | 1158903 | 0.790 ppb |
| 2019-11-04 | 1158904 | 0.810 ppb |