trans-1,2-Dichloroethylene
High Meadows Ranch Water Supply
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 | 1 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 6 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-06-25 | AC58033 | ND |
| 2015-07-07 | AC98573 | ND |
| 2015-07-07 | AC98561 | ND |
| 2016-12-09 | AD61950 | ND |
| 2016-12-09 | AD61948 | ND |
| 2017-03-15 | AD75196 | ND |
| 2017-03-15 | AD75194 | ND |
| 2017-03-15 | AD75192 | ND |
| 2017-05-01 | AD81868 | ND |
| 2017-07-28 | AD91365 | ND |
| 2017-11-16 | AE05196 | ND |
| 2018-04-09 | AE21724 | ND |
| 2018-04-09 | AE21718 | ND |
| 2018-04-09 | AE21716 | ND |
| 2019-11-18 | AE89591 | ND |
| 2019-11-18 | AE89593 | ND |
| 2019-11-18 | AE89595 | ND |