trans-1,2-Dichloroethylene
Alexandria
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 | N/A | 0 | 0 | N/A |
| 2015 | 0.0163 ppb | 16 | 1 | ND - 0.260 ppb |
| 2016 | 0.0200 ppb | 9 | 1 | ND - 0.180 ppb |
| 2017 | 0.0280 ppb | 10 | 1 | ND - 0.280 ppb |
| 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 |
|---|---|---|
| 2015-01-14 | 15A0527-02 | ND |
| 2015-01-14 | 15A0527-03 | ND |
| 2015-01-14 | 15A0527-04 | ND |
| 2015-01-14 | 15A0529-02 | ND |
| 2015-01-14 | 15A0529-03 | ND |
| 2015-01-14 | 15A0529-04 | ND |
| 2015-01-14 | 15A0530-01 | ND |
| 2015-01-14 | 15A0527-01 | 0.260 ppb |
| 2015-06-09 | 15F0683-03 | ND |
| 2015-06-09 | 15F0688-01 | ND |
| 2015-06-09 | 15F0686-04 | ND |
| 2015-06-09 | 15F0686-03 | ND |
| 2015-06-09 | 15F0686-02 | ND |
| 2015-06-09 | 15F0683-04 | ND |
| 2015-06-09 | 15F0683-02 | ND |
| 2015-06-09 | 15F0683-01 | ND |
| 2016-02-23 | 16B1261-01 | ND |
| 2016-11-28 | 16K1115-02 | ND |
| 2016-11-28 | 16K1121-01 | ND |
| 2016-11-28 | 16K1118-04 | ND |
| 2016-11-28 | 16K1118-03 | ND |
| 2016-11-28 | 16K1118-02 | ND |
| 2016-11-28 | 16K1118-01 | 0.180 ppb |
| 2016-11-28 | 16K1115-03 | ND |
| 2016-11-28 | 16K1115-01 | ND |
| 2017-09-05 | 17I0174-01 | ND |
| 2017-09-05 | 17I0174-02 | 0.280 ppb |
| 2017-09-05 | 17I0175-01 | ND |
| 2017-09-05 | 17I0175-02 | ND |
| 2017-09-05 | 17I0175-03 | ND |
| 2017-09-05 | 17I0175-04 | ND |
| 2017-09-05 | 17I0180-01 | ND |
| 2017-09-05 | 17I0180-02 | ND |
| 2017-09-05 | 17I0180-03 | ND |
| 2017-09-05 | 17I0180-04 | ND |
| 2018-05-29 | 18E2383-01 | ND |
| 2019-10-15 | 19J0985-01 | ND |