Trichloroacetic acid
Beaver Dam Water Utility
Trichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids 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 | 0.339 ppb | 16 | 16 | 0.165 ppb - 0.541 ppb |
| 2015 | 0.440 ppb | 16 | 16 | 0.209 ppb - 0.605 ppb |
| 2016 | 1.25 ppb | 6 | 6 | 0.331 ppb - 5.19 ppb |
| 2017 | 0.550 ppb | 2 | 2 | 0.500 ppb - 0.600 ppb |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.1 ppb
The EWG Health Guideline of 0.1 ppb for trichloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.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 |
|---|---|---|
| 2014-02-18 | 4020610-05 | 0.350 ppb |
| 2014-02-18 | 4020610-04 | 0.350 ppb |
| 2014-02-18 | 4020610-03 | 0.370 ppb |
| 2014-02-18 | 4020610-02 | 0.230 ppb |
| 2014-05-19 | 4050664-01 | 0.401 ppb |
| 2014-05-19 | 4050664-02 | 0.469 ppb |
| 2014-05-19 | 4050664-03 | 0.536 ppb |
| 2014-05-19 | 4050664-04 | 0.541 ppb |
| 2014-08-12 | 4080524-01 | 0.237 ppb |
| 2014-08-12 | 4080523-01 | 0.296 ppb |
| 2014-08-12 | 4080525-01 | 0.266 ppb |
| 2014-08-12 | 4080521-01 | 0.165 ppb |
| 2014-11-18 | 4110674-02 | 0.289 ppb |
| 2014-11-18 | 4110674-01 | 0.228 ppb |
| 2014-11-18 | 4110674-03 | 0.338 ppb |
| 2014-11-18 | 4110674-04 | 0.352 ppb |
| 2015-02-16 | 5020537-02 | 0.401 ppb |
| 2015-02-16 | 5020537-01 | 0.514 ppb |
| 2015-02-16 | 5020540-01 | 0.394 ppb |
| 2015-02-16 | 5020540-02 | 0.376 ppb |
| 2015-05-22 | 5050951-04 | 0.289 ppb |
| 2015-05-22 | 5050951-03 | 0.282 ppb |
| 2015-05-22 | 5050951-01 | 0.209 ppb |
| 2015-05-22 | 5050951-02 | 0.297 ppb |
| 2015-08-12 | 5080573-01 | 0.470 ppb |
| 2015-08-12 | 5080575-01 | 0.489 ppb |
| 2015-08-12 | 5080577-01 | 0.523 ppb |
| 2015-08-12 | 5080576-01 | 0.566 ppb |
| 2015-11-11 | 5110414-01 | 0.512 ppb |
| 2015-11-11 | 5110416-01 | 0.526 ppb |
| 2015-11-11 | 5110412-01 | 0.586 ppb |
| 2015-11-11 | 5110418-01 | 0.605 ppb |
| 2016-02-22 | 6020765-01 | 0.478 ppb |
| 2016-02-22 | 6020768-01 | 5.19 ppb |
| 2016-02-22 | 6020769-01 | 0.516 ppb |
| 2016-02-22 | 6020764-01 | 0.495 ppb |
| 2016-11-09 | 6110440-01 | 0.331 ppb |
| 2016-12-14 | 6120516-01 | 0.515 ppb |
| 2017-12-18 | 3841592 | 0.500 ppb |
| 2017-12-18 | 3841576 | 0.600 ppb |
| 2018-10-29 | 4107097 | ND |
| 2018-10-29 | 4107096 | ND |
| 2019-10-16 | 4460104 | ND |
| 2019-10-16 | 4460232 | ND |