Grading and drainage in unincorporated Maricopa County are regulated by the Flood Control District (FCDMC) and Planning and Development Department. Grading plans must show pad and finished floor elevations complying with floodplain requirements. The Drainage Policies and Standards Manual governs stormwater conveyance. Projects must capture and treat the first flush on-site without discharging into FCDMC right-of-way.
Grading and drainage in unincorporated Maricopa County are jointly regulated by the Planning and Development Department and the Flood Control District of Maricopa County (FCDMC). All grading permits require submission of engineered grading plans showing existing and proposed elevations, drainage patterns, and finished floor elevations that comply with floodplain regulations. The FCDMC Drainage Policies and Standards Manual requires projects to capture and retain the 'first flush' (typically the first 0.5 inches of rainfall runoff) on-site to prevent pollutant discharge into washes and waterways. Development within FEMA-designated floodplains requires additional review and must demonstrate no adverse impact on base flood elevations. The desert terrain of Maricopa County makes proper drainage critical, as monsoon storms can produce dangerous flash flooding.
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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