trans-1,2-Dichloroethylene
Chaffee PWS
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 | 12 | 0 | ND |
| 2015 | ND | 9 | 0 | ND |
| 2016 | ND | 12 | 0 | ND |
| 2017 | ND | 8 | 0 | ND |
| 2018 | ND | 4 | 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 |
|---|---|---|
| 2014-01-28 | AC17614 | ND |
| 2014-01-28 | AC17615 | ND |
| 2014-01-28 | AC17613 | ND |
| 2014-04-21 | AC22456 | ND |
| 2014-04-21 | AC22457 | ND |
| 2014-04-21 | AC22458 | ND |
| 2014-07-21 | AC30020 | ND |
| 2014-07-21 | AC30021 | ND |
| 2014-07-21 | AC30022 | ND |
| 2014-11-06 | AC39176 | ND |
| 2014-11-16 | AC39267 | ND |
| 2014-11-16 | AC39268 | ND |
| 2015-04-28 | AC45743 | ND |
| 2015-04-28 | AC45742 | ND |
| 2015-04-28 | AC45741 | ND |
| 2015-08-03 | AC58304 | ND |
| 2015-08-03 | AC58305 | ND |
| 2015-08-03 | AC58306 | ND |
| 2015-10-28 | AC61941 | ND |
| 2015-10-28 | AC61942 | ND |
| 2015-10-28 | AC61943 | ND |
| 2016-01-29 | AC65712 | ND |
| 2016-01-29 | AC65711 | ND |
| 2016-01-29 | AC65710 | ND |
| 2016-04-26 | AC70001 | ND |
| 2016-04-26 | AC70002 | ND |
| 2016-04-26 | AC70003 | ND |
| 2016-08-01 | AC80701 | ND |
| 2016-08-01 | AC80699 | ND |
| 2016-08-01 | AC80700 | ND |
| 2016-10-25 | AC85947 | ND |
| 2016-10-25 | AC85948 | ND |
| 2016-10-25 | AC85946 | ND |
| 2017-01-19 | AC89825 | ND |
| 2017-01-19 | AC89827 | ND |
| 2017-01-19 | AC89826 | ND |
| 2017-04-24 | AC95073 | ND |
| 2017-04-24 | AC95072 | ND |
| 2017-04-24 | AC95071 | ND |
| 2017-07-17 | AD02378 | ND |
| 2017-10-23 | AD08579 | ND |
| 2018-01-10 | AD12050 | ND |
| 2018-05-06 | AD18663 | ND |
| 2018-07-16 | AD29540 | ND |
| 2018-10-15 | AD35060 | ND |
| 2019-01-09 | AD38372 | ND |
| 2019-04-08 | AD46663 | ND |
| 2019-07-10 | AD52709 | ND |
| 2019-10-20 | AD57371 | ND |