trans-1,2-Dichloroethylene
Hillview Water Co-raymond
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 9 | 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 |
|---|---|---|
| 2015-07-28 | 5810-019-1220 | ND |
| 2015-12-14 | 5810-019-0947 | ND |
| 2016-10-18 | 5810-019-1207 | ND |
| 2017-01-16 | 5810-019-1200 | ND |
| 2017-04-11 | 5810-019-1114 | ND |
| 2018-03-06 | 5810-016-0806 | ND |
| 2018-08-01 | 5810-020-1020 | ND |
| 2018-08-01 | 5810-018-1040 | ND |
| 2018-08-28 | 5810-018-1310 | ND |
| 2018-09-19 | 5810-006-0914 | ND |
| 2018-09-19 | 5810-010-0821 | ND |
| 2018-09-19 | 5810-004-0845 | ND |
| 2018-10-11 | 5810-020-1338 | ND |
| 2018-10-12 | 5810-018-1400 | ND |
| 2019-01-10 | 5810-018-1020 | ND |
| 2019-01-10 | 5810-020-0955 | ND |
| 2019-04-23 | 5810-018-1500 | ND |
| 2019-04-23 | 5810-020-1445 | ND |