Yes indeed the state's do have their own codes and land use regulations which vary from state to state and urban, suburban and rural population density's are also factors impacting allowable usage. One might get away with greywater discharge in the boonies for awhile untill happened upon by someone who cares, whereas, if a person trys to pull off a greywater, "event", whilst Walmart camping, KOA or any formal campground camping, state or national park camping or simply freelance camping, there's a better chance than not that they would be ordered to cease and desist! Hint: For maxium stealth, after operating your washing machine, bug out and reassemble in another location, whereupon, you can string up your unmentionables to dry. ?