trans-1,2-Dichloroethylene
Virgin Valley Water District
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 8 | 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 |
|---|---|---|
| 2015-07-15 | 1507436-003-VOC | ND |
| 2015-07-15 | 15071436-004-VOC | ND |
| 2015-07-15 | 1507436-002-VOC | ND |
| 2016-07-20 | 201607250054 | ND |
| 2016-07-20 | 201607250056 | ND |
| 2016-07-20 | 201607250051 | ND |
| 2017-03-21 | 201703210358 | ND |
| 2018-06-20 | 1806612-003 | ND |
| 2018-06-20 | 1806612-002 | ND |
| 2018-07-18 | 1807612-001 | ND |
| 2018-09-19 | 18090629-001 | ND |
| 2019-06-19 | 19060631-001 | ND |
| 2019-06-19 | 19060631-002 | ND |
| 2019-07-01 | 19070015-001 | ND |
| 2019-07-01 | 19070016-001 | ND |
| 2019-08-07 | 19080219-001 | ND |
| 2019-09-25 | 19090892-001 | ND |
| 2019-11-20 | 19110586-001 | ND |
| 2019-12-04 | 19120106-001 | ND |