trans-1,2-Dichloroethylene
Nokomis
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 | 2 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | 0.605 ppb | 4 | 3 | ND - 0.930 ppb |
| 2023 | 0.138 ppb | 4 | 1 | ND - 0.550 ppb |
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 |
|---|---|---|
| 2018-02-27 | 8024299-01 | ND |
| 2018-05-29 | 8054925-01 | ND |
| 2018-09-12 | 8092353-01 | ND |
| 2018-11-07 | 8111674-01 | ND |
| 2019-02-19 | 9023188-01 | ND |
| 2019-06-04 | 9060831-01 | ND |
| 2019-07-25 | 9075349-01 | ND |
| 2019-10-15 | 9103590-01 | ND |
| 2020-02-12 | 0022488-01 | ND |
| 2020-04-07 | 0041452-01 | ND |
| 2021-03-18 | EC03922-01 | ND |
| 2021-05-28 | EE05532-01 | ND |
| 2021-08-19 | EH04492-01 | ND |
| 2021-10-20 | EJ04333-01 | ND |
| 2022-03-10 | FC02417-01 | ND |
| 2022-06-28 | FF05319-01 | 0.930 ppb |
| 2022-09-15 | FI03132-01 | 0.790 ppb |
| 2022-12-15 | FL03384-01 | 0.700 ppb |
| 2023-03-16 | GC03092-01 | ND |
| 2023-06-22 | GF04250-01 | 0.550 ppb |
| 2023-09-21 | GI03909-01 | ND |
| 2023-12-28 | GL04623-01 | ND |