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Lewis 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 Lewis 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

Flood hazard zone permit: required before construction begins
Hazard areas based on: 1981 Flood Insurance Study/FIRM, as amended
Administered by: the Lewis County building official
Permit expires: after 180 days without work
Penalty: up to $1,000 per day per violation
Appeals: hearing examiner or Pollution Control Hearings Board

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 Lewis 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 Lewis County, WA on the FEMA flood map

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

Summary

Any construction or development within a special flood hazard area of unincorporated Lewis County needs a flood hazard zone permit before work begins, under LCC § 15.35.140. The area is defined by the county's 1981 Flood Insurance Study and FIRM maps, as amended, and the county building official administers the permit, reviewing site plans, elevations, and floodway impacts before approval.

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

This chapter shall apply to all areas subject to a base flood and/or designated as an area of special flood hazard within the jurisdiction of Lewis County. ... A development permit entitled flood hazard zone permit shall be obtained before construction or development begins within any area of special flood hazard established in LCC § 15.35.060. The permit shall be for all structures including manufactured homes, as set forth in LCC § 15.35.040, and for all other development including fill and other activities, also as set forth in LCC § 15.35.040. ... A notice of violation and order for penalty may be issued by the administrator or designee pursuant to LCC § 1.20.040, except that the cumulative penalty may total up to $1,000 per day for each violation assessed against the person(s) to whom the notice and order to correct the violation is directed.

View official code

Full Breakdown

050. 060. 140 requires a flood hazard zone permit covering all structures, including manufactured homes, and other development such as fill. The application must show the lowest floor elevation of every structure, any floodproofing elevation, engineer or architect certification of floodproofing methods for nonresidential buildings, and how any watercourse will be altered. A permit expires if work does not start within 180 days or is suspended for 180 days, though the administrator can grant up to two six-month extensions, and the whole project must finish within two years of the permit's effective date. 310, and keeps the elevation certifications on file for public inspection. 150. 25 LCC.

Violations & Fines

It is unlawful to violate any provision of the flood damage prevention chapter. Under § 15.35.180, the administrator can issue a notice of violation and order carrying a cumulative civil penalty of up to $1,000 per day for each violation, separate from Lewis County's general $250-per-day code enforcement penalty. A penalty imposed jointly with the state under WAC 173-158-090 can be appealed directly to the state Pollution Control Hearings Board.

Frequently Asked Questions

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

Yes. LCC § 15.35.140 requires a flood hazard zone permit before any construction or development begins in an area of special flood hazard, covering structures, manufactured homes, fill, and other development, with site plans and elevation data submitted to the county building official.

How does the county know which areas are flood hazard zones?

Section 15.35.060 adopts the Flood Insurance Study for Lewis County, dated November 1981, and its accompanying flood insurance rate maps by reference; a new FEMA study automatically replaces the old one, and best available information is used if the maps are unclear.

How long is a Lewis County flood hazard permit good for?

Under § 15.35.140(6), the permit becomes void if work does not begin within 180 days or is suspended for 180 days. The administrator may grant up to two six-month extensions for good cause, but all work must finish within two years of the permit's effective date.

What is the penalty for building in the floodplain without a permit?

Section 15.35.180 makes any violation of the flood damage prevention chapter unlawful and lets the administrator impose a cumulative penalty of up to $1,000 per day per violation, which can be appealed to the hearing examiner or, for state-imposed penalties, the Pollution Control Hearings Board.

Sources & Official References

[1]Lewis County Code (eCode360)

Other rules in Lewis County

Fence Regulations: Height LimitsSome Restrictions Erosion ControlSome Restrictions Flood Elevation RequirementsSome Restrictions Stormwater ManagementSome Restrictions Noise Ordinances: Barking DogsSome Restrictions Fence Regulations: Fence Permit RequirementsSome Restrictions Animal Ordinances: Pet Groomer RulesFew Restrictions Animal Ordinances: MicrochippingSignificant Restrictions Animal Ordinances: Breed RestrictionsSignificant Restrictions

All Lewis County rules

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