trans-1,2-Dichloroethylene
City of San Jose - EVG/EDV/COY
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 | 12 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 8 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2014-01-21 | 9590-005-0914 | ND |
| 2014-01-21 | 9590-006-0839 | ND |
| 2014-02-18 | 9588-012-0902 | ND |
| 2014-03-27 | 1610-003-0810 | ND |
| 2014-03-27 | 1610-002-1000 | ND |
| 2014-03-27 | 1610-001-1130 | ND |
| 2014-03-27 | 1610-004-0900 | ND |
| 2014-04-15 | 1610-013-0852 | ND |
| 2014-04-15 | 1610-011-0935 | ND |
| 2014-06-25 | 1610-004-1130 | ND |
| 2014-06-25 | 1610-003-0735 | ND |
| 2014-08-05 | 1610-007-0920 | ND |
| 2015-06-09 | 1610-003-0740 | ND |
| 2015-09-08 | 1610-004-0826 | ND |
| 2016-06-14 | 1610-003-0750 | ND |
| 2016-09-13 | 1610-004-0852 | ND |
| 2017-01-17 | 1610-002-0835 | ND |
| 2017-01-17 | 1610-004-0925 | ND |
| 2017-01-17 | 1610-001-1036 | ND |
| 2017-01-31 | 1610-003-0819 | ND |
| 2017-05-02 | 1610-011-1006 | ND |
| 2017-05-16 | 1610-012-1145 | ND |
| 2017-09-12 | 5867-004-0943 | ND |
| 2017-09-26 | 1610-013-1030 | ND |
| 2018-05-29 | 1610-003-0815 | ND |
| 2019-05-14 | 1610-012-0949 | ND |