What the law says
Here's what Bothell Municipal Code 18.04.260 says about allowing pesticides and fertilizers to go down the storm drains:
"
It shall be prohibited and in violation of this chapter for any person or entity to:
A. Throw, drain, or otherwise discharge, cause or allow others under its control to throw, drain or otherwise discharge into the municipal storm drain system and/or surface and ground waters any materials other than storm water. Examples of prohibited contaminants include but are not limited to the following:
...13. Pesticides, herbicides, or fertilizers."