Most California cities have a problem with anything other than rainwater draining to the street. We haven't a clue and as fatboy stated, the city that you are in has the answer.
I am surprised that the runoff from landscape irrigation is allowed. That's an obvious hole in the regulations with wasted water that contains fertilizers, pesticides and herbicides.
When I rains the work email that I no longer have would send me a message advising me to stay out of the ocean because the runoff from human habitation is deadly. The message was wasted on me due to a healthy respect for sharks. I used to free-dive at Pigeon Point until a diver was bitten by a great white. I missed the abalone but not the 52° water. Pigeon Point is now a nature preserve so it's off limits. Down the coast a ways is Davenport Beach. It's a bit of a far kick to the kelp beds but we found ten inch red abalone.
Trim and pound the whole abalone with a convex head wood hammer…. softly. Wrap the abalone, a lot of jack cheese and half a stick of butter in tinfoil. Bake for one hour at 350°. Gosh it was good.
Freeze the trimmings in a paper milk carton. The next time you dive, place the frozen trimmings in a mesh bag….tie the bag to your float anchor. Every time that you return to the float, check the bag. You will find a cabezon sitting there with the rope coming out of it’s mouth. The fish relies on camouflage.…but your brain is bigger and better. Spear the fish….repeat.
