Dichloroacetic acid
Orleans Water Department
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | 0.888 ppb | 16 | 13 | ND - 1.60 ppb |
| 2016 | 0.754 ppb | 16 | 13 | ND - 1.20 ppb |
| 2017 | 0.973 ppb | 16 | 13 | ND - 2.00 ppb |
| 2018 | 0.781 ppb | 16 | 12 | ND - 1.80 ppb |
| 2019 | 0.504 ppb | 16 | 10 | ND - 1.20 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 | Result |
|---|---|
| 2015-02-18 | 0.780 ppb |
| 2015-02-18 | 0.680 ppb |
| 2015-02-18 | 0.820 ppb |
| 2015-02-18 | 0.840 ppb |
| 2015-05-13 | ND |
| 2015-05-13 | ND |
| 2015-05-13 | 1.60 ppb |
| 2015-05-13 | 1.20 ppb |
| 2015-08-12 | ND |
| 2015-08-12 | 1.000 ppb |
| 2015-08-12 | 0.600 ppb |
| 2015-08-12 | 0.890 ppb |
| 2015-11-18 | 1.60 ppb |
| 2015-11-18 | 1.40 ppb |
| 2015-11-18 | 1.60 ppb |
| 2015-11-18 | 1.20 ppb |
| 2016-02-17 | ND |
| 2016-02-17 | 0.830 ppb |
| 2016-02-17 | 0.800 ppb |
| 2016-02-17 | 0.820 ppb |
| 2016-05-18 | 0.880 ppb |
| 2016-05-18 | ND |
| 2016-05-18 | 0.950 ppb |
| 2016-05-18 | 0.970 ppb |
| 2016-08-10 | 1.10 ppb |
| 2016-08-10 | 1.000 ppb |
| 2016-08-10 | 1.20 ppb |
| 2016-08-10 | 0.600 ppb |
| 2016-11-16 | 0.800 ppb |
| 2016-11-16 | 1.20 ppb |
| 2016-11-16 | 0.920 ppb |
| 2016-11-16 | ND |
| 2017-02-15 | 1.60 ppb |
| 2017-02-15 | 1.60 ppb |
| 2017-02-15 | 1.10 ppb |
| 2017-02-15 | 1.50 ppb |
| 2017-05-17 | 0.960 ppb |
| 2017-05-17 | ND |
| 2017-05-17 | 0.860 ppb |
| 2017-05-17 | 0.790 ppb |
| 2017-08-16 | 1.50 ppb |
| 2017-08-16 | 0.810 ppb |
| 2017-08-16 | ND |
| 2017-08-16 | 0.750 ppb |
| 2017-11-15 | 2.00 ppb |
| 2017-11-15 | ND |
| 2017-11-15 | 1.000 ppb |
| 2017-11-15 | 1.10 ppb |
| 2018-02-14 | 0.930 ppb |
| 2018-02-14 | ND |
| 2018-02-14 | 0.650 ppb |
| 2018-02-14 | 0.820 ppb |
| 2018-05-16 | 1.000 ppb |
| 2018-05-16 | 1.50 ppb |
| 2018-05-16 | 0.560 ppb |
| 2018-05-16 | 0.960 ppb |
| 2018-08-15 | ND |
| 2018-08-15 | 0.510 ppb |
| 2018-08-15 | ND |
| 2018-08-15 | ND |
| 2018-11-14 | 1.50 ppb |
| 2018-11-14 | 1.40 ppb |
| 2018-11-14 | 0.870 ppb |
| 2018-11-14 | 1.80 ppb |
| 2019-02-13 | 0.670 ppb |
| 2019-02-13 | 0.860 ppb |
| 2019-02-13 | 0.590 ppb |
| 2019-02-13 | 0.710 ppb |
| 2019-05-15 | 0.800 ppb |
| 2019-05-15 | 0.870 ppb |
| 2019-05-15 | 0.930 ppb |
| 2019-05-15 | 0.790 ppb |
| 2019-08-13 | ND |
| 2019-08-13 | ND |
| 2019-08-13 | 0.650 ppb |
| 2019-08-13 | ND |
| 2019-11-14 | 1.20 ppb |
| 2019-11-14 | ND |
| 2019-11-14 | ND |
| 2019-12-11 | ND |