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Cass County, MO Environmental Rules: Flood Zones (2026)

Significant Restrictions

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

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

Key Facts

Governing order: Floodplain Management Order, § 400.400 et seq.
Applies to: FEMA FW and FF districts, unincorporated county
Permit required: Before any construction or surface disturbance
Administrator: Director of Planning and Zoning
Max fine: $100 per day, misdemeanor, § 400.490
Appeal body: Board of Zoning Adjustment

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 Cass County, MO.

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 Cass County, MO on the FEMA flood map

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

Summary

The Cass County Floodplain Management Order, Zoning Order § 400.400, applies to every unincorporated parcel FEMA maps within the floodway (FW) or flood fringe (FF) district. Section 400.450(C) bars any construction, substantial improvement or surface disturbance in those districts without a county permit.

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

The provisions of this Subsection shall apply to all unincorporated areas of Cass County identified on the Flood Insurance Rate Maps (FIRM) or Floodway Maps as promulgated by the Federal Emergency Management Agency (FEMA) and determined to be within the floodway (FW) and flood fringe (FF) districts as defined in this order. The County shall enforce these floodplain regulations to meet provisions of 44 CFR Part 60, § 60.3.(d) relating to floodplain management criteria for flood-prone areas, and of County Ordinance 06-05, dated March 09, 2006. ... Permit Required. No person, firm or corporation shall initiate any construction or substantial improvement or disturbance of the surface conditions or cause the same to be done within the FW or FF without first obtaining a permit from the County under this Order, and in compliance with FEMA regulations.

View official code

Full Breakdown

3(d) and the county's own Ordinance 06-05. 450(C) requires a permit from the county, on top of any FEMA compliance the project needs. 450(D) requires a written application to the Zoning Department describing the work, the property by legal description, the intended use, and plans and specifications adequate to describe the proposed construction. 450(A). 470 limits permitted uses to low flood-damage activity that will not obstruct flood flows, such as farming, pasture, parking, or unstructured recreation like golf courses and nature preserves; any fill, new construction or substantial improvement in the floodway is prohibited unless a professional engineer certifies it will not raise flood levels.

The Floodway Fringe District allows more, including new residential and non-residential construction, but only if it meets the elevation and flood-proofing standards set out separately for that district. 440(J).

Violations & Fines

Section 400.490 makes any failure to comply with the Floodplain Management Order, including violating the conditions of a variance, a misdemeanor: a fine of not more than one hundred dollars ($100.00) plus the county's costs and expenses in the case, and every day the violation continues beyond the first day is a separate offense and a separate fine. The Director of Planning and Zoning administers enforcement, and the Order does not stop any other authority from taking further lawful action to prevent or remedy a violation.

Frequently Asked Questions

Do I need a permit to build in a Cass County floodplain?

Yes. Section 400.450(C) bars any construction, substantial improvement, or disturbance of surface conditions inside the floodway (FW) or flood fringe (FF) district without first obtaining a permit from the county, in addition to any FEMA requirements the project must meet. The application goes to the Cass County Zoning Department.

What can be built in the Cass County Floodway District without special engineering?

Very little. Section 400.470 limits the Floodway District to low flood-damage uses that will not obstruct flood flows, such as farming, pasture, parking, and unstructured recreation like golf courses or nature preserves. Fill, new construction, or substantial improvement is prohibited unless a professional engineer certifies it will not raise flood levels.

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

Section 400.490 makes a violation of the Floodplain Management Order a misdemeanor punishable by a fine of up to one hundred dollars plus the county's costs, and every day the violation continues after the first day counts as a separate offense with its own fine.

Sources & Official References

[1]Cass County Code §§ 400.400-400.490, eCode360

Other rules in Cass County

Parking Rules: Street Parking LimitsSome Restrictions Noise Ordinances: Quiet HoursSome Restrictions Parking Rules: RV & Boat ParkingLight Restrictions Stormwater ManagementSome Restrictions Erosion ControlSome Restrictions Flood Elevation RequirementsSome Restrictions Noise Ordinances: Decibel LimitsSome Restrictions Parking Rules: Abandoned VehiclesSome Restrictions Parking Rules: Snow Removal Parking RulesSome Restrictions

All Cass County rules

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