trans-1,2-Dichloroethylene
Northstone Gardens
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 | 1 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 6 | 0 | ND |
| 2018 | ND | 5 | 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 |
|---|---|---|
| 2014-04-29 | E404O46-2VOC | ND |
| 2015-11-16 | E511F85-2VOC | ND |
| 2016-03-21 | E603I93-1VOC | ND |
| 2016-04-13 | E604D77-1VOC | ND |
| 2016-08-08 | E608970-1VOC | ND |
| 2016-10-24 | E610O78-1VOC | ND |
| 2017-02-23 | BX74934VOC1 | ND |
| 2017-02-23 | BX74935VOC1 | ND |
| 2017-04-19 | BY07097VOC1 | ND |
| 2017-04-27 | D7D2025-01VOC | ND |
| 2017-09-19 | BZ04731VOC1 | ND |
| 2017-12-20 | BZ64273VOC1 | ND |
| 2018-02-15 | BZ90097VOC1 | ND |
| 2018-03-29 | CA11239VOC1 | ND |
| 2018-04-24 | CA35451VOC1 | ND |
| 2018-07-24 | CA97525 | ND |
| 2018-09-17 | CB32866 | ND |
| 2019-06-26 | CD45967 | ND |