trans-1,2-Dichloroethylene
Littlerock Creek Irrigation 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 | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-03-04 | 3761-021-0900 | ND |
| 2014-03-04 | 3761-019-0845 | ND |
| 2014-03-04 | 3761-011-0830 | ND |
| 2014-03-04 | 3761-008-0800 | ND |
| 2015-08-04 | 3761-008-0740 | ND |
| 2015-08-04 | 3761-011-0750 | ND |
| 2015-08-04 | 3761-021-0825 | ND |
| 2015-08-04 | 3761-019-0800 | ND |
| 2016-08-02 | 3761-008-0818 | ND |
| 2016-08-02 | 3761-021-0833 | ND |
| 2016-08-02 | 3761-011-0827 | ND |
| 2016-08-09 | 3761-019-0900 | ND |
| 2017-08-15 | 3761-019-0930 | ND |
| 2017-08-15 | 3761-011-0915 | ND |
| 2017-08-15 | 3761-021-0945 | ND |
| 2017-08-15 | 3761-008-0900 | ND |
| 2018-08-28 | 3761-019-0940 | ND |
| 2018-08-28 | 3761-011-0920 | ND |
| 2018-08-28 | 3761-021-0900 | ND |
| 2018-08-28 | 3761-008-0840 | ND |
| 2019-08-06 | 3761-011-0900 | ND |
| 2019-08-06 | 3761-019-0920 | ND |
| 2019-08-06 | 3761-008-0830 | ND |