trans-1,2-Dichloroethylene
Norwich Public Utilities
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 | 3 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-05-01 | 6300210VOC1 | ND |
| 2014-05-01 | 6300211VOC1 | ND |
| 2014-05-01 | 6300209VOC1 | ND |
| 2015-08-19 | 6301190VOC1 | ND |
| 2015-08-19 | 6301191VOC1 | ND |
| 2015-08-19 | 6301192VOC1 | ND |
| 2016-11-17 | 6302524VOC1 | ND |
| 2016-11-17 | 6302525VOC1 | ND |
| 2016-11-17 | 6302526VOC1 | ND |
| 2017-06-15 | PH-0453-6303177V | ND |
| 2017-06-15 | PH-0453-6303179V | ND |
| 2017-06-15 | PH-0453-6303178V | ND |
| 2018-09-18 | PH-0453-6304496V | ND |
| 2018-09-18 | PH-0453-6304497V | ND |
| 2018-10-03 | PH-0453-6304498V | ND |
| 2019-08-29 | PH-0453-6305609V | ND |
| 2019-08-29 | PH-0453-6305611V | ND |
| 2019-09-16 | PH-0453-6305610V | ND |