trans-1,2-Dichloroethylene
Paw Homesite
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 | 0.500 ppb | 8 | 4 | ND - 1.50 ppb |
| 2015 | 0.438 ppb | 8 | 4 | ND - 1.40 ppb |
| 2016 | 0.525 ppb | 8 | 4 | ND - 1.40 ppb |
| 2017 | 0.450 ppb | 8 | 4 | ND - 1.10 ppb |
| 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 |
|---|---|---|
| 2014-01-08 | 24405801 | 1.50 ppb |
| 2014-01-08 | 24405701 | ND |
| 2014-04-02 | 25334601 | 0.700 ppb |
| 2014-04-02 | 25334501 | ND |
| 2014-07-09 | 26110301 | 0.800 ppb |
| 2014-07-09 | 26110201 | ND |
| 2014-10-01 | 27098701 | ND |
| 2014-10-01 | 27098801 | 1.000 ppb |
| 2015-01-07 | 12297069 | 0.800 ppb |
| 2015-01-07 | 12297048 | ND |
| 2015-04-15 | 12642918 | 0.800 ppb |
| 2015-04-15 | 12642897 | ND |
| 2015-07-15 | 13023156 | 0.500 ppb |
| 2015-07-15 | 13023135 | ND |
| 2015-10-06 | 13399414 | ND |
| 2015-10-06 | 13399435 | 1.40 ppb |
| 2016-01-05 | 13763233 | ND |
| 2016-01-05 | 13763254 | 0.800 ppb |
| 2016-04-05 | 14115626 | ND |
| 2016-04-05 | 14115647 | 1.10 ppb |
| 2016-07-01 | 14583660 | ND |
| 2016-07-01 | 14583681 | 0.900 ppb |
| 2016-10-05 | 15088558 | 1.40 ppb |
| 2016-10-05 | 15088537 | ND |
| 2017-01-05 | 15529623 | ND |
| 2017-01-05 | 15529644 | 0.800 ppb |
| 2017-04-05 | 15950744 | ND |
| 2017-04-05 | 15950765 | 0.800 ppb |
| 2017-07-07 | 16426347 | ND |
| 2017-07-07 | 16426368 | 1.10 ppb |
| 2017-10-05 | 16892548 | ND |
| 2017-10-05 | 16892569 | 0.900 ppb |
| 2018-01-10 | 38158601 | ND |
| 2018-04-04 | 39069901 | ND |
| 2018-07-03 | 40201501 | ND |
| 2018-10-04 | 41308901 | ND |
| 2019-01-09 | 42495701 | ND |
| 2019-04-10 | 43656201 | ND |
| 2019-07-16 | 45013801 | ND |
| 2019-10-10 | 46829601 | ND |