trans-1,2-Dichloroethylene
Paw Penn 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 | 8 | 0 | ND |
| 2019 | ND | 10 | 0 | ND |
| 2020 | ND | 11 | 0 | ND |
| 2021 | ND | 8 | 0 | ND |
| 2022 | ND | 8 | 0 | ND |
| 2023 | ND | 11 | 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 |
|---|---|---|
| 2018-01-11 | 38161501 | ND |
| 2018-01-11 | 38161101 | ND |
| 2018-01-11 | 38161401 | ND |
| 2018-01-11 | 38161301 | ND |
| 2018-01-11 | 38161201 | ND |
| 2018-04-11 | 39072601 | ND |
| 2018-07-16 | 40207301 | ND |
| 2018-10-17 | 41961701 | ND |
| 2019-01-09 | 42499201 | ND |
| 2019-01-09 | 42499601 | ND |
| 2019-01-09 | 42499501 | ND |
| 2019-01-09 | 42499401 | ND |
| 2019-01-09 | 42499301 | ND |
| 2019-04-01 | 43658101 | ND |
| 2019-07-08 | 45016101 | ND |
| 2019-07-15 | 45716201 | ND |
| 2019-10-07 | 46831501 | ND |
| 2019-10-31 | 43999801 | ND |
| 2020-01-06 | 21542689.00 | ND |
| 2020-01-06 | 21542537.00 | ND |
| 2020-01-06 | 21542647.00 | ND |
| 2020-01-06 | 21542605.00 | ND |
| 2020-01-06 | 21542626.00 | ND |
| 2020-01-06 | 21542558.00 | ND |
| 2020-01-06 | 21542579.00 | ND |
| 2020-01-15 | 21542668.00 | ND |
| 2020-05-06 | 22261494.00 | ND |
| 2020-08-17 | 22843891.00 | ND |
| 2020-10-08 | 23224112.00 | ND |
| 2021-01-14 | 23754060.00 | ND |
| 2021-01-14 | 23754039.00 | ND |
| 2021-01-14 | 23754102.00 | ND |
| 2021-01-14 | 23754081.00 | ND |
| 2021-04-14 | 24290660.00 | ND |
| 2021-04-21 | 24290989.00 | ND |
| 2021-07-01 | 24873772.00 | ND |
| 2021-10-06 | 25448159.00 | ND |
| 2022-01-05 | 25982953.00 | ND |
| 2022-01-05 | 25982890.00 | ND |
| 2022-01-05 | 25982930.00 | ND |
| 2022-01-05 | 25982952.00 | ND |
| 2022-01-05 | 25982871.00 | ND |
| 2022-04-06 | 26506759.00 | ND |
| 2022-07-05 | 27082964.00 | ND |
| 2022-10-06 | 27684631.00 | ND |
| 2023-01-05 | 28212790.00 | ND |
| 2023-01-05 | 28212889.00 | ND |
| 2023-01-05 | 28212868.00 | ND |
| 2023-01-05 | 28212827.00 | ND |
| 2023-01-05 | 28212828.00 | ND |
| 2023-01-05 | 28212777.00 | ND |
| 2023-01-05 | 28212893.00 | ND |
| 2023-04-13 | 28749307.00 | ND |
| 2023-06-07 | 29155726.00 | ND |
| 2023-07-20 | 29346698.00 | ND |
| 2023-10-12 | 29928198.00 | ND |