Dichloroacetic acid
Hudson Waterworks
Dichloroacetic 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 | ND | 2 | 0 | ND |
| 2015 | 0.138 ppb | 8 | 1 | ND - 1.10 ppb |
| 2016 | 0.646 ppb | 16 | 13 | ND - 2.10 ppb |
| 2017 | 0.358 ppb | 16 | 15 | ND - 0.630 ppb |
| 2018 | 0.363 ppb | 16 | 13 | ND - 0.700 ppb |
| 2019 | 0.579 ppb | 16 | 16 | 0.250 ppb - 1.10 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.2 ppb
The EWG Health Guideline of 0.2 ppb for dichloroacetic 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 |
|---|---|---|
| 2014-08-18 | 811212 | ND |
| 2014-08-18 | 811213 | ND |
| 2015-09-15 | 883173 | ND |
| 2015-09-15 | 883174 | ND |
| 2015-09-15 | 883172 | ND |
| 2015-09-15 | 883171 | 1.10 ppb |
| 2015-12-14 | 897936 | ND |
| 2015-12-14 | 897939 | ND |
| 2015-12-14 | 897938 | ND |
| 2015-12-14 | 897937 | ND |
| 2016-03-16 | 910635 | ND |
| 2016-03-16 | 910637 | 0.570 ppb |
| 2016-03-16 | 910636 | ND |
| 2016-03-16 | 910638 | ND |
| 2016-06-13 | 926540 | 0.300 ppb |
| 2016-06-13 | 926542 | 0.760 ppb |
| 2016-06-13 | 926539 | 0.800 ppb |
| 2016-06-13 | 926541 | 2.10 ppb |
| 2016-09-12 | 944807 | 0.560 ppb |
| 2016-09-12 | 944804 | 1.30 ppb |
| 2016-09-12 | 944805 | 0.900 ppb |
| 2016-09-12 | 944806 | 0.820 ppb |
| 2016-12-12 | 965933 | 0.650 ppb |
| 2016-12-12 | 965934 | 0.910 ppb |
| 2016-12-12 | 965932 | 0.540 ppb |
| 2016-12-12 | 965935 | 0.130 ppb |
| 2017-03-14 | 977897 | ND |
| 2017-03-14 | 977896 | 0.300 ppb |
| 2017-03-14 | 977899 | 0.360 ppb |
| 2017-03-14 | 977898 | 0.450 ppb |
| 2017-06-13 | 997248 | 0.240 ppb |
| 2017-06-13 | 997246 | 0.420 ppb |
| 2017-06-13 | 997245 | 0.450 ppb |
| 2017-06-13 | 997247 | 0.520 ppb |
| 2017-09-11 | 1017337 | 0.440 ppb |
| 2017-09-11 | 1017335 | 0.410 ppb |
| 2017-09-11 | 1017336 | 0.290 ppb |
| 2017-09-11 | 1017334 | 0.0860 ppb |
| 2017-12-12 | 1033118 | 0.630 ppb |
| 2017-12-12 | 1033119 | 0.340 ppb |
| 2017-12-12 | 1033121 | 0.280 ppb |
| 2017-12-12 | 1033120 | 0.510 ppb |
| 2018-03-19 | 1045728 | ND |
| 2018-03-19 | 1045727 | 0.370 ppb |
| 2018-03-19 | 1045726 | 0.400 ppb |
| 2018-03-19 | 1045729 | 0.450 ppb |
| 2018-06-18 | 1062004 | ND |
| 2018-06-18 | 1062006 | 0.310 ppb |
| 2018-06-18 | 1062005 | 0.460 ppb |
| 2018-06-18 | 1062003 | 0.700 ppb |
| 2018-09-11 | 1079438 | 0.570 ppb |
| 2018-09-11 | 1079437 | 0.430 ppb |
| 2018-09-11 | 1079436 | ND |
| 2018-09-11 | 1079439 | 0.430 ppb |
| 2018-12-11 | 1097181 | 0.130 ppb |
| 2018-12-11 | 1097183 | 0.470 ppb |
| 2018-12-11 | 1097184 | 0.560 ppb |
| 2018-12-19 | 1098460 | 0.530 ppb |
| 2019-03-19 | 1110407 | 0.300 ppb |
| 2019-03-19 | 1110409 | 0.660 ppb |
| 2019-03-19 | 1110408 | 0.780 ppb |
| 2019-03-19 | 1110410 | 1.10 ppb |
| 2019-06-18 | 1128940 | 0.530 ppb |
| 2019-06-18 | 1128938 | 0.860 ppb |
| 2019-06-18 | 1128937 | 0.540 ppb |
| 2019-06-18 | 1128939 | 0.270 ppb |
| 2019-09-17 | 1148789 | 0.250 ppb |
| 2019-09-17 | 1148790 | 0.270 ppb |
| 2019-09-17 | 1148787 | 0.370 ppb |
| 2019-09-17 | 1148788 | 0.600 ppb |
| 2019-12-09 | 1165055 | 0.270 ppb |
| 2019-12-16 | 1165759 | 0.500 ppb |
| 2019-12-16 | 1165761 | 0.860 ppb |
| 2019-12-16 | 1165760 | 1.10 ppb |