trans-1,2-Dichloroethylene
City of Prescott
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 | 7 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 5 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-01-14 | 477391-001A | ND |
| 2014-01-28 | 478224-001A | ND |
| 2014-01-28 | 478223-001A | ND |
| 2014-01-28 | 478222-001A | ND |
| 2014-02-04 | 478707-001A | ND |
| 2014-02-04 | 478705-001A | ND |
| 2014-05-20 | 485812-001 | ND |
| 2015-06-10 | 509223-001B | ND |
| 2015-07-21 | 511845-001A | ND |
| 2015-11-19 | 519827-001C | ND |
| 2016-03-17 | 526847-001 | ND |
| 2016-04-14 | 550-61972-1V | ND |
| 2016-11-14 | 550-72952-2 | ND |
| 2016-11-14 | 550-72952-1 | ND |
| 2017-04-25 | 550-81719-2VOC | ND |
| 2017-04-25 | 550-81719-1 | ND |
| 2018-01-22 | 550-96713-1VOC | ND |
| 2018-01-22 | 550-96710-2VOC | ND |
| 2018-01-29 | 550-97085-1VOC | ND |
| 2018-05-01 | 550-102163-1 VOC | ND |
| 2018-12-15 | 550-115025-1 VOC | ND |
| 2019-02-12 | 550-117899-3 VOC | ND |
| 2019-02-12 | 550-117899-2 VOC | ND |
| 2019-02-12 | 550-117899-1 VOC | ND |
| 2019-04-18 | 550-121505-1 | ND |