trans-1,2-Dichloroethylene
Northernaire Sanitary District
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 | 2 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 2 | 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 |
|---|---|---|
| 2014-09-19 | 819849 | ND |
| 2014-11-10 | 830595 | ND |
| 2015-03-23 | 849670 | ND |
| 2015-05-29 | 862106 | ND |
| 2015-09-14 | 882543 | ND |
| 2015-11-23 | 895116 | ND |
| 2016-02-23 | 906093 | ND |
| 2016-05-24 | 922339 | ND |
| 2016-09-06 | 942954 | ND |
| 2016-10-24 | 954996 | ND |
| 2017-03-23 | 979203 | ND |
| 2017-06-01 | 994625 | ND |
| 2017-08-09 | 1009520 | ND |
| 2017-11-06 | 1028029 | ND |
| 2018-03-12 | 1044456 | ND |
| 2018-06-19 | 1061893 | ND |
| 2019-03-13 | 1109193 | ND |
| 2019-06-25 | 1130192 | ND |
| 2019-09-25 | 1150841 | ND |
| 2019-09-25 | 1150840 | ND |
| 2019-11-06 | 1159323 | ND |