Maricopa County requires erosion control measures for construction and grading activities in unincorporated areas. The FCDMC Drainage Policies and Standards Manual addresses erosion prevention during and after construction. ADEQ's AZPDES Construction General Permit requires a Stormwater Pollution Prevention Plan (SWPPP) for projects disturbing 1+ acres, including erosion and sediment control best management practices.
Erosion control in unincorporated Maricopa County is regulated through the FCDMC Drainage Policies and Standards Manual and ADEQ's AZPDES Construction General Permit program. Any construction or grading project disturbing one or more acres must obtain an AZPDES permit and implement a Stormwater Pollution Prevention Plan (SWPPP) with best management practices including silt fences, stabilized construction entrances, dust control measures, and temporary sediment basins. The desert soils of Maricopa County are particularly vulnerable to erosion during monsoon storms, which can deliver 1-2 inches of rain in under an hour, creating significant sheet and channel erosion. Post-construction permanent erosion controls such as riprap, erosion blankets, and revegetation with native desert plants are typically required. FCDMC inspectors conduct site inspections during construction to verify compliance, and violations can result in stop-work orders and fines.
Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact Maricopa County code enforcement directly for current fines, enforcement procedures, and hearing options.
Maricopa County, AZ
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See how Maricopa County's erosion control rules stack up against other locations.
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