trans-1,2-Dichloroethylene
City of Nampa
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 | 10 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 7 | 0 | ND |
| 2022 | ND | 2 | 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 |
|---|---|---|
| 2018-07-02 | V1830569 | ND |
| 2018-10-08 | V1850013 | ND |
| 2018-10-08 | V1850014 | ND |
| 2018-10-08 | V1850015 | ND |
| 2018-10-08 | V1850019 | ND |
| 2018-10-08 | V1850023 | ND |
| 2018-10-08 | V1850025 | ND |
| 2018-10-08 | V1850027 | ND |
| 2018-10-08 | V1850028 | ND |
| 2018-10-08 | V1850109 | ND |
| 2020-07-14 | V2033050 | ND |
| 2021-02-08 | V2105829 | ND |
| 2021-02-08 | V2105826 | ND |
| 2021-02-08 | V2105828 | ND |
| 2021-03-08 | V2110615 | ND |
| 2021-03-08 | V2110611 | ND |
| 2021-03-08 | V2110613 | ND |
| 2021-11-09 | V2160872 | ND |
| 2022-11-16 | V2256977 | ND |
| 2022-11-18 | V2256985 | ND |
| 2023-02-01 | V2302073-04 | ND |
| 2023-05-10 | V2309050-02 | ND |
| 2023-11-30 | V2325654-01 | ND |
| 2023-12-21 | V2327316-01 | ND |