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.
The county regulates grading and drainage through its engineering and building codes, requiring a grading permit for excavation or fill above set thresholds. Site drainage must move water away from structures and off adjoining property. On the Colorado Plateau, snowmelt, monsoon bursts, and runoff from the Museum and Pipeline Fire burn scars make drainage design a safety matter, not a formality. Retaining walls above a set height need engineering and separate permits. Development that would obstruct a watercourse or floodplain also requires the Coconino County Flood Control District's authorization under ARS §48-3613, and one-acre-plus sites need an AZPDES stormwater permit.
Unpermitted grading brings a stop-work order and fines. Redirecting drainage onto a neighbor requires corrective action and creates civil liability for resulting flood or mud damage, which post-fire runoff makes worse.
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