trans-1,2-Dichloroethylene
Chester Water Authority
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 3 | 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 |
|---|---|---|
| 2014-01-14 | 1402243 | ND |
| 2014-04-09 | 14042012-001 | ND |
| 2014-07-09 | 14071080-001 | ND |
| 2014-09-30 | 1438033 | ND |
| 2015-01-09 | 12284628 | ND |
| 2015-04-06 | 12630646 | ND |
| 2015-07-08 | 13010232 | ND |
| 2015-10-07 | 13386898 | ND |
| 2016-01-07 | 13750380 | ND |
| 2016-04-07 | 14100342 | ND |
| 2016-07-07 | 14567341 | ND |
| 2016-10-07 | 15073208 | ND |
| 2017-01-10 | 15514890 | ND |
| 2017-04-11 | 15934403 | ND |
| 2017-07-07 | 16410447 | ND |
| 2017-10-11 | 16877394 | ND |
| 2018-01-09 | 2287664001 | ND |
| 2018-05-15 | 8012319-01 | ND |
| 2018-07-12 | 8020049-01 | ND |
| 2019-07-10 | 3044796001 | ND |