cis-1,2-Dichloroethylene
City of Ripon
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.
15
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 1 | 0 | ND |
| 2015 | 0.750 ppb | 4 | 1 | ND - 3.00 ppb |
| 2016 | 0.533 ppb | 3 | 1 | ND - 1.60 ppb |
| 2017 | 1.07 ppb | 3 | 1 | ND - 3.20 ppb |
| 2018 | 1.80 ppb | 3 | 1 | ND - 5.40 ppb |
| 2019 | 3.40 ppb | 1 | 1 | 3.40 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 |
|---|---|---|
| 2014-06-05 | 2625-003-1445 | ND |
| 2015-06-08 | 2625-003-1138 | 3.00 ppb |
| 2015-06-08 | 2625-007-0955 | ND |
| 2015-06-08 | 2625-022-1030 | ND |
| 2015-07-08 | 2625-024-0955 | ND |
| 2016-06-15 | 2625-003-0800 | 1.60 ppb |
| 2016-06-15 | 2625-010-0820 | ND |
| 2016-10-20 | 2625-020-1045 | ND |
| 2017-06-14 | 2625-003-0850 | 3.20 ppb |
| 2017-06-14 | 2625-010-0930 | ND |
| 2017-10-24 | 2625-020-1020 | ND |
| 2018-06-12 | 2625-003-1015 | 5.40 ppb |
| 2018-06-12 | 2625-007-0945 | ND |
| 2018-07-10 | 5810-024-0910 | ND |
| 2019-06-11 | 5810-003-0806 | 3.40 ppb |