trans-1,2-Dichloroethylene
Perquimans County Water System
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 | 2 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-02-19 | 8024-021914-E02V | ND |
| 2014-05-07 | 8024-050714-E02V | ND |
| 2015-05-06 | ND | |
| 2016-01-06 | 8024-010616-E01V | ND |
| 2016-05-04 | 8024-050416-E02V | ND |
| 2017-05-03 | 8024-050317-E02V | ND |
| 2018-05-09 | 8024-050918-E02V | ND |
| 2019-01-08 | 8024-010819-E01V | ND |
| 2019-04-03 | 8024-040319-E01V | ND |
| 2019-08-21 | 8024-082119-E01V | ND |
| 2019-10-15 | 8024-101519-E01V | ND |