The EPA guidelines are nationwide.
HERE
If you read them it says: "If your discharge does not reach waters of the United States, then there are no requirements under the CWA."
What you are dealing with at a minimum is:
1. Fed Regs
2. State Regs
3. Local Regs
4. The company you are washing for's Regs
Each one can be as strict as they want. I'm told in some areas on the Left Coast you can't wash your car in your driveway. I've had truck companies require reclaiming when no one in the county has even heard of it. It's normally on the trucking company if they get pinched but they can go after everyone involved. It's a case of the "deepest pockets syndrome". And a govt agency justifying it's existence.
Many of the advocates that push this are those that manufacture/sell the equipment needed to reclaim. To me it makes a lot of sense in an area that discharges directly into a body of water. But washing a sidewalk with no chems and hot water and almost no runoff makes no sense. Redirecting the runoff on to the grass seems more reasonable.
Just my opinion and worth every penny I'm charging for it.