trans-1,2-Dichloroethylene
City of Chico
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 | 3 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2018-12-13 | Q1851676003 | ND |
| 2018-12-13 | Q1851676006 | ND |
| 2018-12-13 | Q1851676001 | ND |
| 2019-01-08 | Q1900653001 | ND |
| 2019-01-08 | Q1900653006 | ND |
| 2019-01-08 | Q1900653010 | ND |
| 2020-03-02 | Q2007727001 | ND |
| 2020-06-01 | Q2021442001 | ND |
| 2020-08-19 | Q2033209003 | ND |
| 2020-08-19 | Q2033209001 | ND |
| 2021-08-11 | Q2121372007 | ND |
| 2021-08-11 | Q2121372009 | ND |
| 2021-08-11 | Q2121372011 | ND |
| 2022-09-08 | Q2226813001 | ND |
| 2022-09-08 | Q2226813003 | ND |
| 2022-09-08 | Q2226813005 | ND |
| 2023-05-30 | Q2319948009 | ND |
| 2023-05-30 | Q2319948011 | ND |
| 2023-05-30 | Q2319948013 | ND |