Out of all this, the one State noted for the most "per capita environmentalist", is rethinking Gray Water is California. While you would be hard pressed to be given permission to dump gray water in a Forrest, (State or Federal), CA changed some laws in 2009 favoring resue of "Gray Household water". It allows for household use of gray water to maintain gardens etc. Very radical departure from previously laws. Interpreting the laws may take a lawyer, but it might be perfectly acceptable to distribute gray water on private property or at your home. Local restrictions can and do apply, but even environmental lobbies see the Benifits of reclaimed Gray Water at home. Just FYI
Gray Water CA