4,4'-dde
Signal Hill - City, Water Department
6
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 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2016-10-20 | 9588-005-1110 | ND |
| 2016-10-20 | 9588-005-1110 | ND |
| 2017-01-19 | 9588-005-0950 | ND |
| 2017-01-19 | 9588-005-0950 | ND |
| 2017-04-20 | 9588-005-1010 | ND |
| 2017-04-20 | 9588-005-1010 | ND |