trans-1,2-Dichloroethylene
City of Chico
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 | 3 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 3 | 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 |
|---|---|---|
| 2014-08-25 | Q1438988015 | ND |
| 2014-08-25 | Q1438988013 | ND |
| 2014-08-25 | Q1438988011 | ND |
| 2015-03-18 | Q1510146005 | ND |
| 2015-03-18 | Q1510146003 | ND |
| 2015-03-18 | Q1510146001 | ND |
| 2016-12-06 | Q1653274002 | ND |
| 2016-12-06 | Q1653274005 | ND |
| 2016-12-06 | Q1653274003 | ND |
| 2017-02-27 | Q1708321013 | ND |
| 2017-02-27 | Q1708321017 | ND |
| 2017-02-27 | Q1708321016 | ND |
| 2018-12-13 | Q1851676006 | ND |
| 2018-12-13 | Q1851676003 | ND |
| 2018-12-13 | Q1851676001 | ND |
| 2019-01-08 | Q1900653010 | ND |
| 2019-01-08 | Q1900653006 | ND |
| 2019-01-08 | Q1900653001 | ND |