Environmental Rules in Marana, AZ (2026)
4 verified environmental rules for Marana, Arizona, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Marana enforces stormwater management requirements under its MS4 NPDES permit and the Land Development Code. New development must include retention/detention basins, and post-development runoff must not exceed pre-development levels.
Marana Stormwater Management
Some RestrictionsErosion Control
Marana enforces erosion and sediment control through the Land Development Code grading and drainage provisions and the EPA NPDES stormwater permit program. Construction sites disturbing one acre or more must obtain an Arizona Pollutant Discharge Elimination System (AZPDES) Construction General Permit.
Marana Erosion Control Requirements
Heavy RestrictionsFlood Zones
Marana LDC §17-15-10 governs flood hazard reduction. Pima County Regional Flood Control District and FEMA FIRMs apply. FEMA updated Pima County flood maps January 2026 (appeal through April 29, 2026). Santa Cruz River and Tortolita fan washes create significant local flood risk.
Marana Flood Zone Regulations & Building Rules
Heavy RestrictionsGrading & Drainage
Marana requires grading and drainage permits for land disturbance projects under the Land Development Code. The town works with the Pima County Regional Flood Control District to enforce floodplain management and drainage design standards, particularly critical in the Santa Cruz River watershed.
Marana Grading and Drainage Standards
Heavy RestrictionsLooking for Pima County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Marana city rules.
Environmental Rules in Pima County →