trans-1,2-Dichloroethylene
City of Safford
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 5 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 9 | 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 |
|---|---|---|
| 2014-05-20 | 550-24920-9V | ND |
| 2014-05-20 | 550-24920-7V | ND |
| 2014-05-20 | 550-24920-5V | ND |
| 2014-05-20 | 550-24920-3V | ND |
| 2014-05-20 | 550-24920-1V | ND |
| 2017-03-13 | 550-79203-1V | ND |
| 2017-05-08 | 550-82534-1VOC | ND |
| 2017-08-30 | 550-89048-1VOC | ND |
| 2017-09-28 | 550-90609-1VOC | ND |
| 2017-09-28 | 550-90605-1VOC | ND |
| 2017-10-09 | 550-91192-1VOC | ND |
| 2017-10-09 | 550-91194-1VOC | ND |
| 2017-10-09 | 550-91187-1VOC | ND |
| 2017-11-13 | 550-93144-1VOC | ND |
| 2018-01-18 | 550-96585-3 | ND |
| 2018-02-21 | 550-98383-1VOC | ND |
| 2018-05-02 | 550-102282-1 VOC | ND |
| 2018-05-16 | 550-103092-1 VOC | ND |
| 2018-07-25 | 550-106735-1 VOC | ND |
| 2018-08-01 | 550-107260-1 VOC | ND |
| 2018-10-24 | 550-112337-1 VOC | ND |
| 2018-10-30 | 550-112590-1 | ND |
| 2019-01-07 | 550-115930-1 VOC | ND |
| 2019-01-17 | 550-116613-1 VOC | ND |