trans-1,2-Dichloroethylene
Delta City Water Association
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 | 3 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-07-23 | 140724-003VO | ND |
| 2014-08-25 | 140826-011VO | ND |
| 2014-10-29 | 141030-001VO | ND |
| 2015-03-16 | 150317-003VO | ND |
| 2015-05-20 | 150521-012VO | ND |
| 2015-08-10 | 150811-034VO | ND |
| 2015-09-23 | 150924-011VO | ND |
| 2016-12-13 | 161214-010VO | ND |
| 2016-12-13 | 161214-011VO | ND |
| 2017-09-18 | 170919-019VO | ND |
| 2017-09-18 | 170919-020VO | ND |
| 2018-07-26 | 180727-003VO | ND |
| 2018-07-26 | 180727-004VO | ND |
| 2019-07-22 | 190723-013VO | ND |
| 2019-07-22 | 190723-014VO | ND |