trans-1,2-Dichloroethylene
Whippoorwill Bay Subdivision
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 | 2 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 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 |
|---|---|---|
| 2015-09-23 | Q1537353001 | ND |
| 2015-09-23 | Q1537353003 | ND |
| 2016-06-27 | Q1625940001 | ND |
| 2016-09-19 | Q1638291001 | ND |
| 2016-11-17 | Q1650512005 | ND |
| 2016-11-17 | Q1650512007 | ND |
| 2017-09-20 | Q1745420001 | ND |
| 2017-09-20 | Q1745420004 | ND |
| 2018-10-02 | Q1839345009 | ND |
| 2018-10-02 | Q1839345001 | ND |
| 2019-08-06 | Q1951295001 | ND |
| 2019-08-06 | Q1951295003 | ND |