trans-1,2-Dichloroethylene
Cambridge Water & Sewer Utility
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 | 3 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 5 | 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 |
|---|---|---|
| 2014-04-23 | 128940001 | ND |
| 2014-04-23 | 128941001 | ND |
| 2014-07-28 | 147669001 | ND |
| 2014-09-10 | 156274001 | ND |
| 2015-08-12 | 211361001 | ND |
| 2015-08-18 | 212348001 | ND |
| 2015-09-23 | 219678001 | ND |
| 2016-09-20 | 278686001 | ND |
| 2016-09-21 | 279278001 | ND |
| 2017-07-26 | 331335001 | ND |
| 2017-08-28 | 338281001 | ND |
| 2018-09-19 | 408952001 | ND |
| 2019-03-28 | 437574001 | ND |
| 2019-06-12 | 451408001 | ND |
| 2019-08-28 | 466375001 | ND |
| 2019-09-26 | 472880001 | ND |
| 2019-11-14 | 481531001 | ND |