Trichloroacetic acid
Douglas, City Of
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 | 0.560 ppb | 6 | 3 | ND - 1.80 ppb |
| 2015 | 5.03 ppb | 8 | 6 | ND - 26.0 ppb |
| 2016 | 2.68 ppb | 8 | 6 | ND - 15.0 ppb |
| 2017 | 0.488 ppb | 8 | 4 | ND - 1.20 ppb |
| 2018 | 0.308 ppb | 8 | 4 | ND - 0.870 ppb |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-05-13 | C14050380-001B | 0.640 ppb |
| 2014-05-13 | C14050380-002B | ND |
| 2014-08-12 | C14080453-001B | ND |
| 2014-08-12 | C14080453-002B | 0.920 ppb |
| 2014-11-12 | C14110365-002B | 1.80 ppb |
| 2014-11-12 | C14110365-001B | ND |
| 2015-02-10 | C15020328-001B | ND |
| 2015-02-10 | C15020328-002B | 0.570 ppb |
| 2015-05-12 | C15050395-001B | 1.80 ppb |
| 2015-05-12 | C15050395-002B | 1.20 ppb |
| 2015-08-11 | C15080381-002B | 9.20 ppb |
| 2015-08-11 | C15080381-001B | 26.0 ppb |
| 2015-11-10 | C15110316-001B | ND |
| 2015-11-10 | C15110316-002B | 1.50 ppb |
| 2016-02-09 | C16020234-002B | 0.620 ppb |
| 2016-02-09 | C16020234-001B | ND |
| 2016-05-10 | C16050308-002B | 0.760 ppb |
| 2016-05-10 | C16050308-001B | ND |
| 2016-08-09 | C16080369-002B | 2.80 ppb |
| 2016-08-09 | C16080369-001B | 15.0 ppb |
| 2016-11-08 | C16110323-001B | 0.550 ppb |
| 2016-11-08 | C16110323-002B | 1.70 ppb |
| 2017-02-07 | C17020182-001B | ND |
| 2017-02-07 | C17020182-002B | 0.800 ppb |
| 2017-05-09 | C17050326-002B | 0.990 ppb |
| 2017-05-09 | C17050326-001B | ND |
| 2017-08-08 | C17080335-002B | 1.20 ppb |
| 2017-08-08 | C17080335-001B | ND |
| 2017-11-07 | C17110214-002B | 0.910 ppb |
| 2017-11-07 | C17110214-001B | ND |
| 2018-02-06 | C18020130-002B | 0.870 ppb |
| 2018-02-06 | C18020130-001B | 0.540 ppb |
| 2018-05-08 | C18050330-002B | 0.500 ppb |
| 2018-05-08 | C18050330-001B | ND |
| 2018-08-07 | C18080224-001B | ND |
| 2018-08-07 | C18080224-002B | ND |
| 2018-11-06 | C18110156-002B | 0.550 ppb |
| 2018-11-06 | C18110156-001B | ND |