AZ HB2264

Amends Arizona Revised Statutes sections 49-264 and 49-407 to modify citizen suit provisions for environmental violations involving water quality and air quality.

Changes notice period requirement from 120 days to 160 days before commencing water quality citizen suits; maintains 60-day notice period for air quality suits.

Removes provisions that bar citizen suits when the director determines no violation occurred or when the director has initiated administrative enforcement action.

Allows courts to award litigation costs including reasonable attorney and expert witness fees to any party that prevails if determined appropriate, plus to defendants in frivolous actions.

Requires courts to construe these provisions consistently with 33 United States Code section 1365 and judicial interpretations thereof.