Trichloroacetic acid
Brown Deer Waterworks
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 | 1.11 ppb | 15 | 13 | ND - 1.90 ppb |
| 2015 | 0.996 ppb | 16 | 16 | 0.560 ppb - 1.50 ppb |
| 2016 | 0.898 ppb | 16 | 16 | 0.400 ppb - 1.50 ppb |
| 2017 | 1.07 ppb | 16 | 16 | 0.640 ppb - 1.60 ppb |
| 2018 | 1.30 ppb | 16 | 16 | 0.950 ppb - 1.70 ppb |
| 2019 | 1.02 ppb | 16 | 16 | 0.620 ppb - 1.30 ppb |
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 |
|---|---|---|
| 2014-03-04 | 773262 | 0.410 ppb |
| 2014-03-04 | 773264 | 0.410 ppb |
| 2014-03-04 | 773265 | 0.310 ppb |
| 2014-06-04 | 794533 | 1.60 ppb |
| 2014-06-04 | 794531 | 1.80 ppb |
| 2014-06-04 | 794534 | 1.80 ppb |
| 2014-06-04 | 794532 | 1.90 ppb |
| 2014-08-26 | 813415 | ND |
| 2014-08-26 | 813418 | ND |
| 2014-08-26 | 813416 | 0.710 ppb |
| 2014-08-26 | 813417 | 0.940 ppb |
| 2014-11-24 | 833060 | 1.80 ppb |
| 2014-11-24 | 833058 | 1.70 ppb |
| 2014-11-24 | 833059 | 1.70 ppb |
| 2014-11-24 | 833057 | 1.50 ppb |
| 2015-03-05 | 846736 | 0.980 ppb |
| 2015-03-05 | 846737 | 1.30 ppb |
| 2015-03-05 | 846735 | 1.40 ppb |
| 2015-03-05 | 846734 | 1.50 ppb |
| 2015-05-28 | 862174 | 1.000 ppb |
| 2015-05-28 | 862172 | 1.10 ppb |
| 2015-05-28 | 862173 | 1.10 ppb |
| 2015-05-28 | 862175 | 1.20 ppb |
| 2015-08-27 | 879513 | 0.900 ppb |
| 2015-08-27 | 879516 | 0.820 ppb |
| 2015-08-27 | 879515 | 0.850 ppb |
| 2015-08-27 | 879514 | 0.880 ppb |
| 2015-11-30 | 895720 | 0.680 ppb |
| 2015-11-30 | 895718 | 0.950 ppb |
| 2015-11-30 | 895719 | 0.720 ppb |
| 2015-11-30 | 895721 | 0.560 ppb |
| 2016-03-03 | 908050 | 0.760 ppb |
| 2016-03-03 | 908049 | 0.850 ppb |
| 2016-03-03 | 908052 | 0.920 ppb |
| 2016-03-03 | 908051 | 0.650 ppb |
| 2016-06-01 | 923980 | 1.10 ppb |
| 2016-06-01 | 923978 | 1.30 ppb |
| 2016-06-01 | 923979 | 1.50 ppb |
| 2016-06-01 | 923981 | 1.50 ppb |
| 2016-08-30 | 942583 | 0.580 ppb |
| 2016-08-30 | 942584 | 0.620 ppb |
| 2016-08-30 | 942586 | 0.650 ppb |
| 2016-08-30 | 942585 | 0.670 ppb |
| 2016-11-29 | 961458 | 0.400 ppb |
| 2016-11-29 | 961456 | 1.000 ppb |
| 2016-11-29 | 961459 | 0.950 ppb |
| 2016-11-29 | 961457 | 0.920 ppb |
| 2017-03-01 | 975578 | 0.970 ppb |
| 2017-03-01 | 975576 | 0.640 ppb |
| 2017-03-01 | 975577 | 0.740 ppb |
| 2017-03-01 | 975579 | 0.750 ppb |
| 2017-05-30 | 994102 | 1.20 ppb |
| 2017-05-30 | 994104 | 1.30 ppb |
| 2017-05-30 | 994103 | 1.40 ppb |
| 2017-05-30 | 994101 | 1.10 ppb |
| 2017-09-05 | 1015873 | 1.60 ppb |
| 2017-09-05 | 1015875 | 1.50 ppb |
| 2017-09-05 | 1015876 | 1.40 ppb |
| 2017-09-05 | 1015874 | 1.30 ppb |
| 2017-11-29 | 1031290 | 0.860 ppb |
| 2017-11-29 | 1031289 | 0.850 ppb |
| 2017-11-29 | 1031288 | 0.720 ppb |
| 2017-12-04 | 1031738 | 0.820 ppb |
| 2018-03-06 | 1043766 | 0.950 ppb |
| 2018-03-06 | 1043764 | 1.000 ppb |
| 2018-03-06 | 1043767 | 1.10 ppb |
| 2018-03-06 | 1043765 | 1.20 ppb |
| 2018-06-05 | 1058919 | 1.20 ppb |
| 2018-06-05 | 1058921 | 1.40 ppb |
| 2018-06-05 | 1058918 | 1.40 ppb |
| 2018-06-05 | 1058920 | 1.40 ppb |
| 2018-08-29 | 1077074 | 1.40 ppb |
| 2018-08-29 | 1077072 | 1.30 ppb |
| 2018-08-29 | 1077073 | 1.000 ppb |
| 2018-08-29 | 1077071 | 1.30 ppb |
| 2018-11-26 | 1094175 | 1.40 ppb |
| 2018-11-26 | 1094174 | 1.50 ppb |
| 2018-11-26 | 1094173 | 1.50 ppb |
| 2018-11-26 | 1094176 | 1.70 ppb |
| 2019-03-04 | 1107597 | 0.620 ppb |
| 2019-03-04 | 1107598 | 0.680 ppb |
| 2019-03-04 | 1107600 | 0.710 ppb |
| 2019-03-04 | 1107599 | 0.780 ppb |
| 2019-06-03 | 1124573 | 0.970 ppb |
| 2019-06-03 | 1124572 | 1.000 ppb |
| 2019-06-03 | 1124574 | 0.990 ppb |
| 2019-06-03 | 1124575 | 0.910 ppb |
| 2019-08-28 | 1144336 | 1.10 ppb |
| 2019-08-28 | 1144335 | 1.20 ppb |
| 2019-08-28 | 1144337 | 1.20 ppb |
| 2019-08-28 | 1144334 | 1.30 ppb |
| 2019-11-25 | 1162591 | 1.10 ppb |
| 2019-11-25 | 1162592 | 1.20 ppb |
| 2019-11-25 | 1162590 | 1.20 ppb |
| 2019-12-02 | 1162832 | 1.30 ppb |