1,1-Dichloroethylene
City of Chino Hills
1,1-Dichloroethylene is used for plastics production. It damages DNA and causes cancer in laboratory animal studies.
9
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 | 2 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | 0.365 ppb | 2 | 1 | ND - 0.730 ppb |
| 2017 | ND | 4 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 1 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EPA Maximum Contaminant
Level (MCL) 7 ppb
The legal limit for 1,1-dichloroethylene, established in 1987, was based on a toxicity study conducted in laboratory animals in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-23 | 4790-001-1300 | ND |
| 2014-01-23 | 4790-017-1330 | ND |
| 2016-03-03 | 4790-014-1130 | ND |
| 2016-03-03 | 4790-024-1030 | 0.730 ppb |
| 2017-02-16 | 9588-001-1010 | ND |
| 2017-02-16 | 9588-017-1040 | ND |
| 2017-04-19 | 9588-009-1030 | ND |
| 2017-04-19 | 9588-010-0945 | ND |
| 2019-11-26 | 4790-014-0820 | ND |