trans-1,2-Dichloroethylene
Blevins Waterworks
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 | 1 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 7 | 0 | ND |
| 2018 | ND | 8 | 0 | ND |
| 2019 | ND | 6 | 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 |
|---|---|---|
| 2014-04-28 | 14120000209 | ND |
| 2015-10-20 | 15296000701 | ND |
| 2016-01-26 | 16028001402 | ND |
| 2016-06-01 | 16154000701 | ND |
| 2016-07-20 | 16203006001 | ND |
| 2016-10-25 | 16301001701 | ND |
| 2017-01-23 | 17025000201 | ND |
| 2017-05-09 | 17130008101 | ND |
| 2017-05-09 | 17130007901 | ND |
| 2017-07-18 | 17200003801 | ND |
| 2017-07-18 | 17200003701 | ND |
| 2017-11-01 | 17306002701 | ND |
| 2017-11-01 | 17306002601 | ND |
| 2018-02-19 | 18053002402 | ND |
| 2018-02-19 | 18053004401 | ND |
| 2018-04-24 | 18115002501 | ND |
| 2018-04-24 | 18115002601 | ND |
| 2018-08-01 | 18214001101 | ND |
| 2018-08-28 | 18242000701 | ND |
| 2018-12-03 | 18340005201 | ND |
| 2018-12-03 | 18340005301 | ND |
| 2019-02-06 | 19038003901 | ND |
| 2019-02-06 | 19038004002 | ND |
| 2019-08-05 | 19220003108 | ND |
| 2019-08-05 | 19220003008 | ND |
| 2019-10-29 | 19304001401 | ND |
| 2019-10-29 | 19304001301 | ND |