The 2019 Arizona Multisite General Permit (MSGP) replaces ADEQ’s 2010 Non-Mining and Mining MSGP; the 2019 MSGPs became effective on Jan. 1, 2020.
Existing permittees (those who have coverage under the 2010 permit(s)) have between Jan. 1, 2020, and Feb. 28, 2020, to submit a Notice of Intent (NOI) to ADEQ. A Stormwater Pollution Prevention Plan (SWPPP) must be developed by the time the NOI is submitted.
Prior to Jan. 1, 2020, existing permittees must continue to comply with their coverage under 2010 MSGP (e.g., monitoring, reporting, inspections, etc.). New and unpermitted facilities that are subject to industrial stormwater permitting must apply under 2010 MSGP for stormwater discharges, as required by the Clean Water Act, and federal and state law.