trans-1,2-Dichloroethylene
East Orange County Water District - Rz
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 | 3 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 10 | 0 | ND |
| 2018 | ND | 8 | 0 | ND |
| 2019 | ND | 8 | 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 |
|---|---|---|
| 2014-04-16 | 4417-001-1105 | ND |
| 2014-08-27 | 4417-001-0920 | ND |
| 2014-11-25 | 4417-001-0905 | ND |
| 2015-03-18 | 4417-001-1225 | ND |
| 2015-05-06 | 4417-001-0845 | ND |
| 2015-08-11 | 4417-001-1045 | ND |
| 2015-12-01 | 4417-001-1040 | ND |
| 2016-02-25 | 4417-001-0900 | ND |
| 2016-05-03 | 4417-001-1120 | ND |
| 2016-08-08 | 4417-001-0840 | ND |
| 2016-10-13 | 4417-001-0840 | ND |
| 2016-10-13 | 4417-002-0900 | ND |
| 2017-02-08 | 4417-001-1030 | ND |
| 2017-02-08 | 4417-002-1040 | ND |
| 2017-05-03 | 4417-001-0925 | ND |
| 2017-05-03 | 4417-002-0940 | ND |
| 2017-08-07 | 4417-002-1010 | ND |
| 2017-08-10 | 4417-001-1035 | ND |
| 2017-11-01 | 4417-001-0850 | ND |
| 2017-11-08 | 4417-002-0920 | ND |
| 2017-11-30 | 4417-002-1330 | ND |
| 2017-11-30 | 4417-002-1320 | ND |
| 2018-02-14 | 4417-001-1005 | ND |
| 2018-02-15 | 4417-002-0945 | ND |
| 2018-05-02 | 4417-001-0855 | ND |
| 2018-05-03 | 4417-002-0850 | ND |
| 2018-08-02 | 4417-002-1010 | ND |
| 2018-08-02 | 4417-001-1000 | ND |
| 2018-10-30 | 4417-001-0820 | ND |
| 2018-10-30 | 4417-002-0830 | ND |
| 2019-02-20 | 4417-001-0905 | ND |
| 2019-02-20 | 4417-002-0850 | ND |
| 2019-04-23 | 4417-002-0910 | ND |
| 2019-04-23 | 4417-001-0855 | ND |
| 2019-09-03 | 4417-002-0905 | ND |
| 2019-09-03 | 4417-001-0855 | ND |
| 2019-11-05 | 4417-001-0925 | ND |
| 2019-11-05 | 4417-002-0930 | ND |