4,4'-dde
Chehalis Water Department
8
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 |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 4 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2019-07-25 | ND | |
| 2019-07-25 | ND | |
| 2019-07-25 | ND | |
| 2019-07-25 | ND | |
| 2021-03-11 | 4091004 | ND |
| 2021-03-11 | 4091004 | ND |
| 2022-12-27 | 4399689 | ND |
| 2022-12-27 | 4399689 | ND |