EPA.
When I flew in the US for an airline we would cycle our planes through Mexico to have them washed because so many airports don't want to comply with the EPA regs on wash racks.
Look for tightening of EPA regulations on "brown water" storage and runoff for homeowners and businesses. I foresee the time coming that washing cars will have to be done at an "approved" facility.
You don't have to wait, that's already happening in place with heavy water restrictions. You can't wash your car at home with a hose, you have to go to a car wash that recycles the water. It's been going on for quite a while in some places.