trans-1,2-Dichloroethylene
Earlysville Forest
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 1 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 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 |
|---|---|---|
| 2014-07-02 | 1407522-02A-V | ND |
| 2015-08-17 | 00281-REI CONSUL | ND |
| 2015-08-26 | 00281-REI CONSUL | ND |
| 2016-03-15 | 16031913-02A | ND |
| 2016-04-19 | 16042030-01A | ND |
| 2016-07-27 | 16073032-02A | ND |
| 2016-11-08 | 1611493-02A-V | ND |
| 2017-01-17 | 17011700-04A | ND |
| 2017-07-24 | 17073283-03A | ND |
| 2018-01-17 | 18012010-04A | ND |
| 2018-08-21 | 18H0962-03 | ND |
| 2019-01-16 | 19A0886-04 | ND |