trans-1,2-Dichloroethylene
Windsor Water Utility North
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 | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2014-08-26 | 153487001 | ND |
| 2014-09-22 | 158728001 | ND |
| 2014-10-22 | 165118001 | ND |
| 2015-03-02 | 181210001 | ND |
| 2015-04-27 | 189820001 | ND |
| 2015-07-13 | 204839001 | ND |
| 2015-10-20 | 224588001 | ND |
| 2016-03-14 | 700307 | ND |
| 2016-05-24 | 256303001 | ND |
| 2016-06-07 | 258536001 | ND |
| 2016-08-10 | 938523 | ND |
| 2017-04-24 | 984924 | ND |
| 2017-04-24 | 984927 | ND |
| 2018-05-30 | 1058006 | ND |
| 2019-05-08 | 1119976 | ND |