trans-1,2-Dichloroethylene
Westborough 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 | 12 | 0 | ND |
| 2015 | ND | 13 | 0 | ND |
| 2016 | ND | 12 | 0 | ND |
| 2017 | ND | 14 | 0 | ND |
| 2018 | ND | 16 | 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 | Result |
|---|---|
| 2014-05-21 | ND |
| 2014-05-21 | ND |
| 2014-05-21 | ND |
| 2014-05-21 | ND |
| 2014-05-21 | ND |
| 2014-05-21 | ND |
| 2014-05-21 | ND |
| 2014-05-21 | ND |
| 2014-05-21 | ND |
| 2014-05-21 | ND |
| 2014-06-27 | ND |
| 2014-12-16 | ND |
| 2015-04-17 | ND |
| 2015-05-12 | ND |
| 2015-05-12 | ND |
| 2015-05-12 | ND |
| 2015-06-02 | ND |
| 2015-06-02 | ND |
| 2015-06-02 | ND |
| 2015-06-02 | ND |
| 2015-06-02 | ND |
| 2015-06-04 | ND |
| 2015-06-04 | ND |
| 2015-06-04 | ND |
| 2015-09-17 | ND |
| 2016-05-12 | ND |
| 2016-05-12 | ND |
| 2016-05-12 | ND |
| 2016-05-12 | ND |
| 2016-05-13 | ND |
| 2016-05-13 | ND |
| 2016-05-13 | ND |
| 2016-05-25 | ND |
| 2016-05-25 | ND |
| 2016-05-25 | ND |
| 2016-05-25 | ND |
| 2016-05-25 | ND |
| 2017-05-02 | ND |
| 2017-05-02 | ND |
| 2017-05-02 | ND |
| 2017-05-02 | ND |
| 2017-05-02 | ND |
| 2017-05-02 | ND |
| 2017-05-02 | ND |
| 2017-05-16 | ND |
| 2017-05-16 | ND |
| 2017-05-16 | ND |
| 2017-05-16 | ND |
| 2017-05-16 | ND |
| 2017-08-31 | ND |
| 2017-11-14 | ND |
| 2018-03-01 | ND |
| 2018-06-20 | ND |
| 2018-06-20 | ND |
| 2018-06-20 | ND |
| 2018-06-20 | ND |
| 2018-06-20 | ND |
| 2018-06-20 | ND |
| 2018-06-20 | ND |
| 2018-06-20 | ND |
| 2018-06-26 | ND |
| 2018-06-26 | ND |
| 2018-06-26 | ND |
| 2018-06-26 | ND |
| 2018-06-26 | ND |
| 2018-06-26 | ND |
| 2018-09-12 | ND |
| 2019-07-24 | ND |
| 2019-07-24 | ND |
| 2019-07-24 | ND |