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Rockville, MD Environmental Rules: Flood Zones (2026)

Significant Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

FEMA flood zone rules in Rockville, MD, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.

Key Facts

Requires: Floodplain variance + permit
Administered by: Dept. of Public Works
NFIP participation since: January 5, 1978
Permit-only exemptions: Split-rail fences, minor landscaping
Max fine: $1,000/violation/day

FEMA Flood Zone Lookup

FEMA assigns every parcel in the U.S. a flood-hazard designation on its Flood Insurance Rate Maps (FIRMs). Zones starting with A or V are high-risk Special Flood Hazard Areas where federally backed mortgages require NFIP flood insurance. Zone X indicates moderate-to-minimal risk, where insurance is optional but often recommended. Your specific zone determines insurance cost, build elevation, and permit requirements in Rockville, MD.

Zone	What it means	NFIP required?
A	High-risk flood area; 1% annual chance flood, no detailed analysis.	Yes
AE	High-risk; same as A but with established Base Flood Elevations.	Yes
AH	High-risk shallow flooding (1-3 ft), usually ponding.	Yes
AO	High-risk shallow flooding (1-3 ft) with sheet flow on sloping terrain.	Yes
V	High-risk coastal zone subject to wave action (no BFE).	Yes
VE	High-risk coastal zone with wave action and established BFEs.	Yes
X (shaded)	Moderate risk; between the 1% and 0.2% annual chance flood.	Recommended
X	Minimal risk; outside the 0.2% annual chance floodplain.	No

Look up Rockville, MD on the FEMA flood map

FEMA maps update periodically; verify zone before buying flood insurance or building.

Summary

Any filling, grading, new construction, or substantial improvement inside a FEMA-mapped special flood hazard area in Rockville needs both a City floodplain variance and a floodplain permit before work starts.

A floodplain variance and floodplain permit from the City are required for development or construction within the special flood hazard area, including: filling; grading; construction of new structures; the substantial improvement of buildings or structures, including repair of substantial damage; placement or replacement of manufactured structures, including substantial improvement or repair of substantial damage of manufactured structures; erecting or installing a temporary structure, or alteration of a watercourse.
The following are exempted from requiring a floodplain variance and only require a floodplain permit:
(1)Public utility transmission, distribution, or collection pipes, lines and facilities;(2)Public facilities owned or operated by the City, provided that they are located and constructed to minimize flood damage;(3)Minor landscaping installation and maintenance;(4)Split-rail fences or other fences deemed by the City to not be obstructive to the passage of floodwaters;(5)Play or seating equipment that is not a structure; and(6)Patios, decks, paths and paving less than one thousand (1,000) square feet that do not raise the surrounding grade by more than one (1) foot.(7)Recreational vehicles that are fully licensed and ready for highway use or are on a site for less than one hundred eighty (180) consecutive days. (Ord. No. 1-17, § 1, 1-9-17)

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 17 Update 1).

Full Breakdown

Chapter 10, adopted under Ord. No. 1-17 to keep the City in the National Flood Insurance Program (it has participated since January 5, 1978), requires a floodplain variance and floodplain permit for development in the special flood hazard area, filling, grading, new structures, substantial improvement or repair of substantial damage, manufactured structure placement, temporary structures, and watercourse alteration (Sec. 10-4, 10-26, 10-36). A short list, utility lines, City-owned facilities, minor landscaping, split-rail fences, play equipment, small patios/decks under 1,000 sq ft, and short-stay licensed RVs, needs only the permit, not the variance. The Floodplain Administrator in the Department of Public Works reviews applications; denials are appealable to the Board of Appeals.

Violations & Fines

Starting development in a special flood hazard area without an approved floodplain variance and permit violates Sec. 10-46 and can draw a stop-work order, abatement order, and administrative fines up to $1,000 per violation per day under Sec. 10-47.

Frequently Asked Questions

Do I need a permit for a deck in Rockville's floodplain?

Patios, decks, and paving under 1,000 sq ft that don't raise the grade more than a foot skip the variance but the full exemption list is in Sec. 10-4 and Sec. 10-26(b): check both before building.

Who decides Rockville floodplain permit applications?

The City's Floodplain Administrator, in the Department of Public Works, with appeals going to the Board of Appeals under Sec. 10-18.

Sources & Official References

[1]Rockville City Code § 10-4, § 10-46 (Municode)

Other rules in Rockville

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All Rockville rules

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