trans-1,2-Dichloroethylene
City Of Rio Vista
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 |
|---|---|---|---|---|
| 2014 | ND | 3 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 5 | 0 | ND |
| 2018 | ND | 8 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-07-07 | 5867-005-0935 | ND |
| 2014-07-07 | 5867-004-0955 | ND |
| 2014-07-07 | 5867-001-0855 | ND |
| 2015-07-06 | 5867-001-0840 | ND |
| 2016-07-22 | 5867-001-1105 | ND |
| 2016-07-22 | 5867-005-1135 | ND |
| 2016-07-22 | 5867-004-1045 | ND |
| 2017-05-04 | 5867-016-1037 | ND |
| 2017-07-12 | 5867-005-1142 | ND |
| 2017-07-12 | 5867-004-1157 | ND |
| 2017-09-12 | 5867-016-1220 | ND |
| 2017-12-07 | 5867-016-1115 | ND |
| 2018-03-05 | 5867-016-1225 | ND |
| 2018-03-26 | 5867-015-0935 | ND |
| 2018-03-26 | 5867-003-1025 | ND |
| 2018-04-02 | 5867-007-1115 | ND |
| 2018-04-02 | 5867-014-1040 | ND |
| 2018-06-04 | 5867-016-1155 | ND |
| 2018-07-02 | 5867-004-1110 | ND |
| 2018-07-02 | 5867-005-1125 | ND |
| 2019-07-01 | 5867-004-1330 | ND |
| 2019-07-01 | 5867-005-1320 | ND |