Bromoform
Whitefish Bay 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 | 0.328 ppb | 16 | 16 | 0.200 ppb - 0.520 ppb |
| 2015 | 0.259 ppb | 8 | 6 | ND - 0.470 ppb |
| 2016 | 0.194 ppb | 8 | 6 | ND - 0.330 ppb |
| 2017 | 0.169 ppb | 8 | 4 | ND - 0.420 ppb |
| 2018 | 0.0888 ppb | 8 | 3 | ND - 0.280 ppb |
| 2019 | 0.111 ppb | 8 | 4 | ND - 0.250 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 |
|---|---|---|
| 2014-03-06 | 773483 | 0.270 ppb |
| 2014-03-06 | 773479 | 0.270 ppb |
| 2014-03-06 | 773480 | 0.270 ppb |
| 2014-03-10 | 773814 | 0.230 ppb |
| 2014-06-03 | 794087 | 0.360 ppb |
| 2014-06-03 | 794088 | 0.390 ppb |
| 2014-06-03 | 794086 | 0.400 ppb |
| 2014-06-03 | 794085 | 0.360 ppb |
| 2014-09-02 | 814924 | 0.200 ppb |
| 2014-09-02 | 814922 | 0.430 ppb |
| 2014-09-02 | 814921 | 0.510 ppb |
| 2014-09-02 | 814923 | 0.520 ppb |
| 2014-12-02 | 833582 | 0.230 ppb |
| 2014-12-02 | 833581 | 0.260 ppb |
| 2014-12-02 | 833579 | 0.270 ppb |
| 2014-12-02 | 833580 | 0.280 ppb |
| 2015-03-03 | 846051 | 0.260 ppb |
| 2015-03-03 | 846052 | 0.260 ppb |
| 2015-06-03 | 863508 | ND |
| 2015-06-03 | 863507 | ND |
| 2015-09-01 | 880145 | 0.470 ppb |
| 2015-09-01 | 880144 | 0.470 ppb |
| 2015-12-02 | 896190 | 0.300 ppb |
| 2015-12-02 | 896191 | 0.310 ppb |
| 2016-03-07 | 908343 | 0.220 ppb |
| 2016-03-07 | 908344 | 0.260 ppb |
| 2016-06-01 | 924003 | ND |
| 2016-06-01 | 924002 | ND |
| 2016-08-30 | 942565 | 0.220 ppb |
| 2016-08-30 | 942568 | 0.250 ppb |
| 2016-11-30 | 962303 | 0.270 ppb |
| 2016-11-30 | 962302 | 0.330 ppb |
| 2017-03-06 | 976165 | 0.240 ppb |
| 2017-03-06 | 976166 | 0.280 ppb |
| 2017-06-05 | 995410 | ND |
| 2017-06-05 | 995409 | ND |
| 2017-08-30 | 1014944 | 0.410 ppb |
| 2017-08-30 | 1014945 | 0.420 ppb |
| 2017-11-29 | 1031296 | ND |
| 2017-11-29 | 1031295 | ND |
| 2018-03-05 | 1043375 | ND |
| 2018-03-05 | 1043376 | ND |
| 2018-06-04 | 1058606 | ND |
| 2018-06-04 | 1058607 | ND |
| 2018-08-30 | 1077340 | ND |
| 2018-08-30 | 1077339 | 0.220 ppb |
| 2018-11-28 | 1094616 | 0.210 ppb |
| 2018-11-28 | 1094615 | 0.280 ppb |
| 2019-03-05 | 1107884 | ND |
| 2019-03-05 | 1107885 | 0.250 ppb |
| 2019-06-04 | 1125116 | ND |
| 2019-06-04 | 1125115 | 0.220 ppb |
| 2019-09-04 | 1145280 | ND |
| 2019-09-04 | 1145279 | 0.200 ppb |
| 2019-12-03 | 1163406 | ND |
| 2019-12-03 | 1163405 | 0.220 ppb |