5 rules for unincorporated Coconino County, Arizona.
Verified from official government sources
Land disturbance of one acre or more in Coconino County needs coverage under Arizona's AZPDES construction stormwater general permit from ADEQ, plus a stormwater pollution prevention plan and county drainage review.
Grading and land-clearing in Coconino County require erosion and sediment controls. Sites of one acre or more also need an AZPDES permit and SWPPP, with post-wildfire slopes demanding extra stabilization against monsoon runoff.
Coconino County is landlocked high country, so 'coastal' rules mean floodplain and watercourse protection. Under ARS §48-3613, you cannot obstruct a watercourse or develop in a mapped floodplain without written authorization from the county Flood Control District.
A.R.S. § 48-3613(A)
a person shall not engage in any development which will divert, retard or obstruct the flow of waters in any watercourse without securing written authorization from the board
Coconino County enforces FEMA flood-zone standards through its Flood Control District. Homes in mapped Special Flood Hazard Areas must be elevated above base flood elevation, and post-fire flash-flood risk has expanded the areas that flood.
Coconino County requires grading permits for significant earthwork and drainage changes. Grading cannot redirect runoff onto neighbors, and on burn-scarred, snowmelt-fed terrain proper drainage is critical. Larger sites also trigger ADEQ's AZPDES stormwater permit.
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