trans-1,2-Dichloroethylene
Nokomis
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 | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | 1.33 ppb | 9 | 1 | ND - 12.0 ppb |
| 2019 | 1.94 ppb | 9 | 2 | ND - 13.0 ppb |
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 |
|---|---|---|
| 2014-03-10 | 4031186-01 | ND |
| 2014-05-19 | 4052817-01 | ND |
| 2014-08-26 | 4084560-01 | ND |
| 2014-12-01 | 4120178-01 | ND |
| 2015-03-09 | 5031192-01 | ND |
| 2015-06-08 | 5061497-01 | ND |
| 2015-07-20 | 5073312-01 | ND |
| 2015-12-07 | 5121204-01 | ND |
| 2016-03-07 | 6031215-01 | ND |
| 2016-04-19 | 6043369-01 | ND |
| 2016-08-10 | 6082291-01 | ND |
| 2016-12-05 | 6120706-01 | ND |
| 2017-02-27 | 7023747-01 | ND |
| 2017-05-29 | 7055060-01 | ND |
| 2017-08-28 | 7085221-01 | ND |
| 2017-11-13 | 7112439-01 | ND |
| 2018-02-27 | 8024299-02 | ND |
| 2018-02-27 | 8024299-01 | ND |
| 2018-05-29 | 8054925-01 | ND |
| 2018-05-29 | 8054925-02 | ND |
| 2018-05-29 | 8054925-03 | ND |
| 2018-09-12 | 8092353-01 | ND |
| 2018-09-12 | 8092353-02 | ND |
| 2018-11-07 | 8111674-01 | ND |
| 2018-11-07 | 8111674-02 | 12.0 ppb |
| 2019-02-19 | 9023188-01 | ND |
| 2019-02-19 | 9023188-02 | ND |
| 2019-06-04 | 9060831-01 | ND |
| 2019-06-04 | 9060831-02 | 4.50 ppb |
| 2019-06-04 | 9060831-03 | ND |
| 2019-07-25 | 9075349-01 | ND |
| 2019-07-25 | 9075349-02 | ND |
| 2019-10-15 | 9103590-02 | 13.0 ppb |
| 2019-10-15 | 9103590-01 | ND |