trans-1,2-Dichloroethylene
Paw Penn 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 | ND | 11 | 0 | ND |
| 2015 | ND | 8 | 0 | ND |
| 2016 | ND | 9 | 0 | ND |
| 2017 | ND | 10 | 0 | ND |
| 2018 | ND | 8 | 0 | ND |
| 2019 | ND | 10 | 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 |
|---|---|---|
| 2014-01-08 | 24408301 | ND |
| 2014-01-08 | 24408001 | ND |
| 2014-01-08 | 24410701 | ND |
| 2014-01-08 | 24410601 | ND |
| 2014-01-08 | 24409501 | ND |
| 2014-01-08 | 24410501 | ND |
| 2014-01-08 | 24410201 | ND |
| 2014-01-08 | 24410401 | ND |
| 2014-04-01 | 25339001 | ND |
| 2014-07-07 | 26114501 | ND |
| 2014-10-01 | 27103201 | ND |
| 2015-01-02 | 12315840 | ND |
| 2015-01-02 | 12315882 | ND |
| 2015-01-02 | 12315861 | ND |
| 2015-01-02 | 12315819 | ND |
| 2015-01-02 | 12315798 | ND |
| 2015-04-03 | 12660726 | ND |
| 2015-07-09 | 13043464 | ND |
| 2015-10-01 | 13419767 | ND |
| 2016-01-06 | 13783277 | ND |
| 2016-01-06 | 13783256 | ND |
| 2016-01-06 | 13783235 | ND |
| 2016-01-06 | 13783193 | ND |
| 2016-01-06 | 13783214 | ND |
| 2016-04-04 | 14139327 | ND |
| 2016-04-18 | 14139349 | ND |
| 2016-07-13 | 14610384 | ND |
| 2016-10-03 | 15112454 | ND |
| 2017-01-04 | 15551717 | ND |
| 2017-01-04 | 15551738 | ND |
| 2017-01-04 | 15551696 | ND |
| 2017-01-04 | 15551759 | ND |
| 2017-01-04 | 15551664 | ND |
| 2017-01-04 | 15551780 | ND |
| 2017-01-04 | 15551643 | ND |
| 2017-04-05 | 15975962 | ND |
| 2017-07-06 | 16450377 | ND |
| 2017-10-11 | 16915031 | ND |
| 2018-01-11 | 38161501 | ND |
| 2018-01-11 | 38161401 | ND |
| 2018-01-11 | 38161301 | ND |
| 2018-01-11 | 38161201 | ND |
| 2018-01-11 | 38161101 | ND |
| 2018-04-11 | 39072601 | ND |
| 2018-07-16 | 40207301 | ND |
| 2018-10-17 | 41961701 | ND |
| 2019-01-09 | 42499301 | ND |
| 2019-01-09 | 42499401 | ND |
| 2019-01-09 | 42499501 | ND |
| 2019-01-09 | 42499201 | ND |
| 2019-01-09 | 42499601 | ND |
| 2019-04-01 | 43658101 | ND |
| 2019-07-08 | 45016101 | ND |
| 2019-07-15 | 45716201 | ND |
| 2019-10-07 | 46831501 | ND |
| 2019-10-31 | 43999801 | ND |