[freespirited]

HOw will they regulate the salt that people throw on the street to melt snow?

That’s a lot of salt.

[Still Thinking]

How will they regulate the salt that people throw on the street to melt snow?

Knowing the government, my guess would be add poison to it to render it inedible. Then when it dissolves in the rain or melted snow, it will soak into the ground (and groundwater) causing some new environmental disaster. (If you don't believe me see MTBE)