Ariz. Rev. Stat. § 48-3622
A person desiring to make a connection to any storm water drain of a flood control district or to cause floodwaters or storm or other waters to be emptied into any ditch or drain of the district shall first apply to the district for permission to make the connection. The district may require the connection to be made in such manner as it directs and may impose reasonable conditions and such reasonable connection fee as it deems proper or, if reasonably justified by the circumstances, may refuse permission. In addition, the district may require any action or impose any restriction that the district considers reasonably necessary to meet the district's obligations, if any, to comply with local, state or federal water quality laws. A person making a connection which causes floodwaters to be so discharged without first having obtained permission is guilty of a class 2 misdemeanor.
A.R.S. § 48-3622