Chemically Treated Water Disposal?

Hi, I am new to pressure washing and was wondering if it is illegal on a federal level for SH water to leave the customer's property? If I use SH do I need to collect it or something in order to not break this law? If so is there anything else I can use to avoid this? I am referring to Federal Laws as well as if someone could help me find my local and state ones as well. I am in Minneapolis/Edina, Minnesota.
 
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