trans-1,2-Dichloroethylene
Chalk Hill Special Utility 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 |
|---|---|---|---|---|
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 3 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2018-06-20 | Q1824487007 | ND |
| 2018-06-20 | Q1824487009 | ND |
| 2018-06-20 | Q1824487006 | ND |
| 2019-01-10 | Q1901411003 | ND |
| 2019-04-08 | Q1914000002 | ND |
| 2019-04-08 | Q1914000005 | ND |
| 2019-04-08 | Q1914000006 | ND |
| 2020-03-23 | Q2012183003 | ND |
| 2020-05-21 | Q2020369001 | ND |
| 2020-12-17 | Q2050083008 | ND |
| 2020-12-17 | Q2050083006 | ND |
| 2021-11-09 | Q2131359012 | ND |
| 2021-11-09 | Q2131359014 | ND |
| 2021-11-09 | Q2131359016 | ND |
| 2022-12-13 | Q2237298001 | ND |
| 2022-12-13 | Q2237298003 | ND |
| 2022-12-13 | Q2237298005 | ND |
| 2023-03-20 | Q2310465003 | ND |
| 2023-05-23 | Q2319409005 | ND |
| 2023-05-23 | Q2319409007 | ND |