trans-1,2-Dichloroethylene
Red Hill Water Authority
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 | 6 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 9 | 0 | ND |
| 2018 | ND | 5 | 0 | ND |
| 2019 | ND | 6 | 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 |
|---|---|---|
| 2014-03-12 | 140010197 | ND |
| 2014-03-12 | 140010198 | ND |
| 2014-03-12 | 140010199 | ND |
| 2014-05-14 | 140020004 | ND |
| 2014-07-23 | 140032263 | ND |
| 2014-11-05 | 140050162 | ND |
| 2015-02-18 | 12402529 | ND |
| 2015-03-04 | 12516327 | ND |
| 2015-04-22 | 12634007 | ND |
| 2015-07-29 | 13013726 | ND |
| 2015-11-18 | 13515027 | ND |
| 2016-02-03 | 13871066 | ND |
| 2016-02-03 | 13871087 | ND |
| 2016-11-10 | 15227184 | ND |
| 2017-02-08 | 15656519 | ND |
| 2017-02-08 | 15656520 | ND |
| 2017-02-08 | 15656521 | ND |
| 2017-03-29 | 15796775 | ND |
| 2017-05-31 | 16095731 | ND |
| 2017-07-26 | 16414771 | ND |
| 2017-09-26 | 16727979 | ND |
| 2017-09-26 | 16727980 | ND |
| 2017-10-18 | 16881228 | ND |
| 2018-02-07 | 8001980-01 | ND |
| 2018-04-25 | 8008151-01 | ND |
| 2018-07-17 | 8017901-01 | ND |
| 2018-08-07 | 8021854-01 | ND |
| 2018-10-22 | 8028636-01 | ND |
| 2019-02-06 | 9002686-01 | ND |
| 2019-05-07 | 9009679-01 | ND |
| 2019-06-25 | 9022004-01 | ND |
| 2019-08-21 | 9025620-01 | ND |
| 2019-09-24 | 9021809-01 | ND |
| 2019-12-16 | 9033958-01 | ND |