Environmental Rules in Marana, AZ: What Residents Actually Need to Know

If you live in Marana or are thinking about moving there, environmental rules are one of those things you probably won't think about until they affect you directly. Marana has 4 specific rules on the books covering different aspects of environmental rules, and some of them might surprise you.

Grading & 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.

Key details: Permit Threshold: 50+ cubic yards or 3+ foot slopes. Drainage Standard: Post-development must not exceed pre-development flows. Flood District: Pima County RFCD co-jurisdiction. Professional Required: Licensed civil engineer or landscape architect. Rainwater Harvesting: Encouraged under HB 2675.

Grading without permit: stop-work order, correction plan, and civil penalty. Altering drainage to damage neighboring property: civil liability and code enforcement action. FEMA floodplain violations: loss of federal flood insurance eligibility and fines.

Compared to other cities, Marana takes a harder line on grading & drainage. The enforcement and penalty structure reflects that.

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.

Key details: Permit: MS4 NPDES permit. Retention: Required for new development. Construction Sites: SWPPP required for 1+ acre disturbance. Flood Control: Pima County RFCD coordination. LID: Encouraged (permeable, swales, harvesting).

SWPPP non-compliance: ADEQ enforcement with fines up to $25,000/day. Illegal discharge: town code enforcement and potential ADEQ referral.

Erosion 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.

Key details: Threshold: 1+ acre disturbance requires AZPDES CGP. SWPPP: Required for all permitted sites. Local Enforcement: Building inspectors verify controls. ADEQ Penalty: Up to $25,000/day. Flood District: Pima County RFCD has co-jurisdiction.

AZPDES permit violation: ADEQ administrative penalties up to $25,000 per day. Failure to implement erosion control: Marana stop-work order and grading permit revocation. Damage to downstream properties: civil liability and additional town penalties.

This is one of the stricter rules in Marana's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Flood 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.

Key details: Code Section: Marana LDC §17-15-10. FEMA Maps: Updated Jan 2026; appeal by Apr 29 2026. Flood District: Pima County RFCD: 520-724-4600. Local Hazards: Santa Cruz River, Tortolita fan washes. Mfr. Homes: Floodplain Use Permit after 180 days.

Unauthorized floodplain development: stop-work order, removal, fines. Manufactured home violation: permit required.

This is one of the stricter rules in Marana's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

The Bottom Line

Marana is tougher than many cities when it comes to environmental rules. Out of the 4 rules covered here, 3 are rated strict. If you are a homeowner, renter, or business owner in Marana, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

Keep in mind that Marana can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.