trans-1,2-Dichloroethylene
Littleton Water Department
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 | 8 | 0 | ND |
| 2016 | ND | 7 | 0 | ND |
| 2017 | ND | 7 | 0 | ND |
| 2018 | ND | 7 | 0 | ND |
| 2019 | ND | 7 | 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 | Result |
|---|---|
| 2014-06-04 | ND |
| 2014-06-04 | ND |
| 2014-06-16 | ND |
| 2014-09-29 | ND |
| 2014-11-17 | ND |
| 2015-02-04 | ND |
| 2015-04-16 | ND |
| 2015-04-22 | ND |
| 2015-04-22 | ND |
| 2015-04-22 | ND |
| 2015-04-22 | ND |
| 2015-04-28 | ND |
| 2015-05-26 | ND |
| 2016-06-09 | ND |
| 2016-06-21 | ND |
| 2016-06-21 | ND |
| 2016-06-21 | ND |
| 2016-06-21 | ND |
| 2016-06-21 | ND |
| 2016-06-21 | ND |
| 2017-05-24 | ND |
| 2017-05-24 | ND |
| 2017-06-19 | ND |
| 2017-06-19 | ND |
| 2017-06-19 | ND |
| 2017-06-19 | ND |
| 2017-06-19 | ND |
| 2018-04-11 | ND |
| 2018-05-01 | ND |
| 2018-05-01 | ND |
| 2018-05-01 | ND |
| 2018-05-07 | ND |
| 2018-05-07 | ND |
| 2018-06-19 | ND |
| 2019-05-01 | ND |
| 2019-05-01 | ND |
| 2019-05-01 | ND |
| 2019-05-01 | ND |
| 2019-05-30 | ND |
| 2019-06-05 | ND |
| 2019-06-17 | ND |