trans-1,2-Dichloroethylene
Stagecoach S/d
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 | 5 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 6 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2014-01-28 | C316312-03 | ND |
| 2014-01-28 | C316312-01 | ND |
| 2014-04-09 | C403286-01 | ND |
| 2014-07-16 | C407951-01 | ND |
| 2014-10-21 | C412146-01 | ND |
| 2015-01-13 | ND | |
| 2016-01-19 | C516141-01 | ND |
| 2016-10-14 | CZ13877-01 | ND |
| 2017-01-24 | CZ18960-01 | ND |
| 2017-01-24 | CZ18958-03 | ND |
| 2017-01-24 | CZ18958-01 | ND |
| 2017-04-25 | CA03099-01 | ND |
| 2017-07-28 | CA07826-01 | ND |
| 2017-11-16 | CA13326-01 | ND |
| 2018-02-21 | CA18460-01 | ND |
| 2018-05-16 | CB03528-01 | ND |
| 2018-07-19 | CB08253-01 | ND |
| 2018-10-16 | CB14421-01 | ND |
| 2019-10-30 | CC15944-01 | ND |