cis-1,2-Dichloroethylene
Quarryville Borough
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.
25
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.840 ppb | 4 | 4 | 0.540 ppb - 1.20 ppb |
| 2015 | 0.905 ppb | 4 | 4 | 0.810 ppb - 0.980 ppb |
| 2016 | 0.870 ppb | 4 | 4 | 0.720 ppb - 1.10 ppb |
| 2017 | 0.450 ppb | 5 | 2 | ND - 1.20 ppb |
| 2018 | ND | 4 | 0 | ND |
| 2019 | 0.400 ppb | 4 | 2 | ND - 0.900 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EPA Maximum Contaminant
Level (MCL) 70 ppb
The legal limit for cis-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 |
|---|---|---|
| 2014-01-09 | 1066488001 | 0.840 ppb |
| 2014-04-10 | 2001029001 | 0.780 ppb |
| 2014-07-10 | 2017224001 | 0.540 ppb |
| 2014-10-09 | 2033571001 | 1.20 ppb |
| 2015-02-19 | 12487563 | 0.920 ppb |
| 2015-04-09 | 12722179 | 0.980 ppb |
| 2015-07-09 | 13108336 | 0.810 ppb |
| 2015-10-08 | 13605083 | 0.910 ppb |
| 2016-01-07 | 13843214 | 0.920 ppb |
| 2016-04-07 | 14216708 | 0.740 ppb |
| 2016-07-14 | 14699913 | 0.720 ppb |
| 2016-10-06 | 15194352 | 1.10 ppb |
| 2017-01-09 | 15625146 | 1.20 ppb |
| 2017-04-06 | 16057664 | ND |
| 2017-08-10 | 16691233 | ND |
| 2017-10-06 | 16991867 | ND |
| 2017-11-09 | 17130615 | 1.05 ppb |
| 2018-01-11 | 7121162-01 | ND |
| 2018-04-09 | 8032882-01 | ND |
| 2018-07-10 | 8062555-01 | ND |
| 2018-10-11 | 8093465-01 | ND |
| 2019-01-10 | 8123550-01 | ND |
| 2019-04-11 | 9032840-01 | ND |
| 2019-07-09 | 9063178-01 | 0.700 ppb |
| 2019-10-10 | 9093307-01 | 0.900 ppb |