trans-1,2-Dichloroethylene
Stillwater Water District 1
1,2-Dichloroethylene, a neurotoxic solvent, exists in two different forms: trans-1,2-dichloroethylene and cis-1,2-dichloroethylene. A mixture of the two forms is used to manufacture other solvents and chemical products.
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 | 3 | 0 | ND |
| 2015 | ND | 9 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 10 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 60 ppb
The EWG Health Guideline of 60 ppb for trans-1,2-dichloroethylene was defined 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. This health guideline protects against harm to internal organs.
EPA Maximum Contaminant
Level (MCL) 100 ppb
The legal limit for trans-1,2-dichloroethylene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-02-26 | 25619-2 | ND |
| 2014-05-14 | 26701-1 | ND |
| 2014-11-18 | 341118151 | ND |
| 2015-05-28 | 350528047 | ND |
| 2015-06-22 | 350622057 | ND |
| 2015-06-22 | 350622055 | ND |
| 2015-06-22 | 350622056 | ND |
| 2015-06-22 | 350622058 | ND |
| 2015-10-12 | 351012043 | ND |
| 2015-10-12 | 351012042 | ND |
| 2015-12-17 | 351217086 | ND |
| 2015-12-17 | 351217085 | ND |
| 2016-06-13 | 360613082 | ND |
| 2016-06-13 | 360613083 | ND |
| 2017-06-19 | 370619130 | ND |
| 2017-06-19 | 370619129 | ND |
| 2018-06-11 | 380611171 | ND |
| 2018-06-11 | 380611167 | ND |
| 2018-06-11 | 380611166 | ND |
| 2018-06-11 | 380611170 | ND |
| 2018-06-11 | 380611169 | ND |
| 2018-06-11 | 380611168 | ND |
| 2018-06-11 | 380611172 | ND |
| 2018-06-11 | 380611173 | ND |
| 2018-10-22 | 381022165 | ND |
| 2018-10-22 | 381022166 | ND |
| 2019-08-07 | 390808183 | ND |
| 2019-08-07 | 390808184 | ND |