The PA Department of Environmental Protection, that’s who!
We usually call them “storm drains” but others use the term “catch basins” or “inlets.” In any case, that’s where runoff from streets goes through a grill and disappears from our sight. But then were does it go? It should drain by gravity though a pipe system and eventually flow into a stream. That’s a problem for the stream, because street runoff can be polluted, e.g, by car and animal wastes.
But when water is able to remain standing in the storm drain, it provides an ideal habitat for mosquitoes to breed! Then those storm drains need to be “treated” (with a larvicide like Bti) to keep larvae from maturing there into adult mosquitoes. Here’s what PA DEP says (you have to keep refreshing the URL in your browser to find this photo and commentary):
The Sartomer Company, which has a production facility at 610 S. Bolmar St., West Chester, Pennsylvania, informs us that:
“The Sartomer site in West Chester is diligent about controlling standing water that could potentially harbor mosquito larvae. Dikes containing storm water runoff at the site are drained daily to eliminate standing water. The site’s waste water treatment holding pond, which has standing water by design, is treated with biological agents to control the potential for mosquito breeding. These efforts are among many actions that the site takes in order maintain a safe workplace and to be a good member of the community.”
Don’t Spray Me! will welcome, and will gladly post, similar statements from other Chester County businesses.
Sartomer in its neighborhood, courtesy of Sartomer Co. (S. Bolmar St., at the bottom, E. Union St. at the right, Goose Creek at the back, then S. Adams and other streets).