Permethrin
King County Water District 111
Permethrin is an insecticide used on agricultural crops, but most uses are non-agricultural. It can be applied to residential areas to control mosquitoes and ticks and also used as a bug repellent on clothing, as well as medical applications to treat head lice. Long-term exposure to permethrin may harm the liver.
11
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 | ND | 5 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-07-18 | 201807190781 | ND |
| 2018-07-23 | 201807240329 | ND |
| 2018-09-10 | 201809110515 | ND |
| 2018-09-10 | 201809110516 | ND |
| 2018-10-08 | 201810090300 | ND |
| 2019-01-14 | 201901150181 | ND |
| 2019-01-14 | 201901150235 | ND |
| 2019-01-14 | 201901150238 | ND |
| 2019-03-07 | 201903080155 | ND |
| 2019-03-07 | 201903080148 | ND |
| 2019-04-10 | 201904110271 | ND |