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Mason County, WA Environmental Rules: Flood Zones (2026)

Significant Restrictions

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

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

Key Facts

Permit required: Before any flood-hazard-area development
Covers: Structures, manufactured homes, fill, grading
Administrator: DCD director or designee
Penalty: Up to $1,000 fine, 60 days jail
Appeal path: Hearing examiner, then superior court
FIRM basis: Flood insurance study dated June 20, 2019

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 Mason County, WA.

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 Mason County, WA on the FEMA flood map

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

Summary

In unincorporated Mason County, no structure or land within a mapped special flood hazard area may be built, altered or filled without a development permit issued under Mason County Code Section 14.22.120. Community Development administers the permit, and Section 14.22.070 makes any noncompliance a misdemeanor punishable by up to $1,000 and 60 days in jail per violation.

These county ordinances apply to unincorporated areas of Mason County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

No structure or land shall hereafter be constructed, located, extended, converted, or altered without full compliance with the terms of this chapter and other applicable regulations. Violation of the provisions of this chapter by failure to comply with any of its requirements (including violations of conditions and safeguards established in connection with conditions) shall constitute a misdemeanor. Any person who violates this chapter or fails to comply with any of its requirements shall upon conviction thereof be fined not more than one thousand dollars, imprisoned for not more than sixty days, or both, for each violation, and in addition shall pay all costs and expenses involved in the case. ... Development Permit Required. A development permit shall be obtained before construction or development begins within any area of special flood hazard established in Section 14.22.060. The permit shall be for all structures including manufactured homes, and for all development including fill and other activities, as set forth in the "definitions." If no other county permit is required, a development permit shall be required.

View official code

Full Breakdown

Mason County Code Chapter 14.22, Flood Damage Prevention, implements the National Flood Insurance Program for the unincorporated county's mapped special flood hazard areas, adopted from the Flood Insurance Study for Mason County dated June 20, 2019 under Section 14.22.060. Section 14.22.120 requires a development permit before any construction, fill, grading or other development begins in a special flood hazard area, covering all structures including manufactured homes; the application, filed with the Mason County Division of Community Services, must show the elevation of the lowest floor relative to base flood elevation and, for nonresidential floodproofing, a professional engineer's or architect's certification.

The administrator, defined in Section 14.22.040 as the director of the department of community development or a designee, reviews and grants or denies these permits and can also approve emergency development consistent with county development regulations. Anyone denied a permit, or contesting a floodplain boundary or administrator interpretation, may appeal to the Mason County hearing examiner sitting as the board of appeals under Section 14.22.150, with further appeal to superior court under Chapter 36.70 RCW. Section 14.22.070 makes building, locating, extending, converting or altering any structure or land without complying with the chapter a misdemeanor, punishable on conviction by a fine of not more than $1,000, imprisonment of not more than 60 days, or both, for each violation, plus all costs and expenses of the case, and it separately notes that Mason County Development Code Chapter 15.13 also governs enforcement of permit violations.

Violations & Fines

Developing in a mapped special flood hazard area without the required Section 14.22.120 permit is a misdemeanor under Section 14.22.070, punishable by up to a $1,000 fine, up to 60 days in jail, or both, for each violation, plus the county's costs and expenses of the case. The county can also pursue permit violations through the general enforcement and civil-fine process in Mason County Code Chapter 15.13.

Frequently Asked Questions

Do I need a county permit to build in a Mason County flood zone?

Yes. Section 14.22.120 requires a development permit before any construction, fill or other development begins within a mapped area of special flood hazard, covering manufactured homes and any activity for which no other county permit already applies, with applications filed through the Division of Community Services.

What happens if I build in the floodplain without a permit?

Section 14.22.070 makes it a misdemeanor to construct, alter or fill land in a special flood hazard area without complying with Chapter 14.22, carrying a fine of up to $1,000, up to 60 days in jail, or both for each violation, plus the county's costs of pursuing the case.

Can I appeal a flood-zone permit denial in Mason County?

Yes. Section 14.22.150 lets the Mason County hearing examiner act as the board of appeals for flood-chapter decisions and variance requests, weighing factors like flood danger, alternative sites and habitat impacts, and anyone aggrieved by that decision may take a further appeal to superior court under RCW 36.70.

Sources & Official References

[1]Mason County Code, Chapter 14.22, Flood Damage Prevention

Other rules in Mason County

Animal Ordinances: Chickens & LivestockSome Restrictions Fence Regulations: Height LimitsSome Restrictions Parking Rules: RV & Boat ParkingSome Restrictions Erosion ControlSome Restrictions Flood Elevation RequirementsSome Restrictions Stormwater ManagementSome Restrictions Boat Dock PermitsSome Restrictions Parking Rules: Loading ZonesSome Restrictions Parking Rules: Commercial & Oversized VehiclesSignificant Restrictions Animal Ordinances: Pet LimitsSome Restrictions

All Mason County rules

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