trans-1,2-Dichloroethylene
Yerkes Water Association
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 | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 5 | 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 |
|---|---|---|
| 2014-11-21 | 14112123-01 | ND |
| 2015-03-28 | 12518146 | ND |
| 2015-06-04 | 12884814 | ND |
| 2015-09-10 | 13267091 | ND |
| 2015-12-07 | 13635785 | ND |
| 2016-03-14 | 13988885 | ND |
| 2016-06-28 | 14573182 | ND |
| 2016-08-04 | 14738625 | ND |
| 2016-11-17 | 15374824 | ND |
| 2017-02-16 | 15798682 | ND |
| 2017-05-04 | 16097843 | ND |
| 2017-08-17 | 16569376 | ND |
| 2017-10-23 | 16883183 | ND |
| 2018-01-11 | 8010197-01 | ND |
| 2018-01-11 | 8010197-02 | ND |
| 2018-04-10 | 8041138-01 | ND |
| 2018-07-19 | 8070920-02 | ND |
| 2018-10-11 | 8101124-02 | ND |
| 2019-01-11 | 9011009-02 | ND |
| 2019-04-02 | 9040376-01 | ND |
| 2019-07-18 | 9070633-01 | ND |
| 2019-10-03 | 9100450-01 | ND |