trans-1,2-Dichloroethylene
Spinsfield Commons
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 | 2 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | 2.50 ppb | 3 | 3 | 1.20 ppb - 4.60 ppb |
| 2022 | 1.10 ppb | 4 | 3 | ND - 2.00 ppb |
| 2023 | 0.325 ppb | 4 | 2 | ND - 0.700 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 |
|---|---|---|
| 2018-11-29 | 1804742-01 | ND |
| 2018-11-29 | 1815101-01 | ND |
| 2019-09-17 | 1915631-01 | ND |
| 2020-06-22 | 2006-02977-001 | ND |
| 2021-03-22 | 2103-02814-001 | 1.70 ppb |
| 2021-07-15 | 2107-02568-001 | 4.60 ppb |
| 2021-10-28 | 2110-04882-001 | 1.20 ppb |
| 2022-01-27 | 2201-03503-001 | ND |
| 2022-04-22 | 2204-03689-001 | 1.40 ppb |
| 2022-07-22 | 2207-04385-001 | 2.00 ppb |
| 2022-10-24 | 2210-04713-001 | 1.000 ppb |
| 2023-01-26 | 2301-04315-001 | ND |
| 2023-04-19 | 2304-03951-001 | ND |
| 2023-08-23 | 2308-05509-001 | 0.700 ppb |
| 2023-10-16 | 2310-03511-001 | 0.600 ppb |