trans-1,2-Dichloroethylene
Town of Ponder
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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 6 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-03-07 | Q1809461002 | ND |
| 2018-03-07 | Q1809461004 | ND |
| 2018-03-07 | Q1809461005 | ND |
| 2018-03-13 | Q1810192001 | ND |
| 2019-04-04 | Q1913697004 | ND |
| 2019-04-04 | Q1913697008 | ND |
| 2019-04-04 | Q1913697011 | ND |
| 2019-04-04 | Q1913697014 | ND |
| 2020-10-08 | Q2039550008 | ND |
| 2020-10-08 | Q2039550010 | ND |
| 2020-10-08 | Q2039550012 | ND |
| 2020-10-08 | Q2039550014 | ND |
| 2021-06-28 | Q2116757008 | ND |
| 2021-06-28 | Q2116757012 | ND |
| 2021-06-28 | Q2116757010 | ND |
| 2021-06-28 | Q2116757006 | ND |
| 2021-09-01 | Q2123816001 | ND |
| 2021-11-18 | Q2132416001 | ND |
| 2022-06-30 | Q2218550001 | ND |
| 2022-06-30 | Q2218550003 | ND |
| 2022-06-30 | Q2218550006 | ND |
| 2022-06-30 | Q2218550008 | ND |
| 2023-09-14 | Q2339666004 | ND |
| 2023-09-14 | Q2339666006 | ND |
| 2023-09-14 | Q2339666008 | ND |
| 2023-09-14 | Q2339666010 | ND |