What 44 CFR 59.1 Says an SFHA, Base Flood, and FIRM Are

Federal regulation 44 CFR 59.1 defines an “area of special flood hazard” as land in a community’s flood plain with at least a 1 percent annual chance of flooding, defines “base flood” as the flood with a one percent annual chance of being equalled or exceeded, and defines “Flood Insurance Rate Map (FIRM)” as the official map on which FEMA delineates hazard areas and risk zones. The cited eCFR page also displays a title-wide “up to date as of” banner and a Federal Register credit line for § 59.1.

This original record-reading guide is a general reading aid, not cited evidence. It does not depict a source record; the article text and source links provide the facts.

Key points

• 44 CFR 59.1 defines “area of special flood hazard” as land with a 1 percent or greater annual chance of flooding, and states that this phrase is synonymous with “special flood hazard area.”
• The same section defines “base flood” as the flood having a one percent chance of being equalled or exceeded in any given year.
• It also defines “Flood Insurance Rate Map (FIRM)” as FEMA’s official map showing special hazard areas and risk premium zones, noting a digital version is called a DFIRM.
• The cited eCFR page displays a title-wide “up to date as of” banner and a Federal Register credit line for § 59.1.
• This article does not identify where any SFHA boundary runs, whether any property sits inside one, or anything about insurance need or cost.

Special flood hazard area

44 CFR 59.1 states: “Area of special flood hazard is the land in the flood plain within a community subject to a 1 percent or greater chance of flooding in any given year. The area may be designated as Zone A on the FHBM. After detailed ratemaking has been completed in preparation for publication of the flood insurance rate map, Zone A usually is refined into Zones A, AO, AH, A1-30, AE, A99, AR, AR/A1-30, AR/AE, AR/AO, AR/AH, AR/A, VO, or V1-30, VE, or V. For purposes of these regulations, the term “special flood hazard area” is synonymous in meaning with the phrase “area of special flood hazard.”“ (44 CFR 59.1)

What “base flood” means

The same section defines the base flood in a single sentence: “Base flood means the flood having a one percent chance of being equalled or exceeded in any given year” (44 CFR 59.1). This is the statistical flood event — often described elsewhere as a “1-in-100-year flood” — that the special flood hazard area definition above is built around.

FIRM and DFIRM terms

44 CFR 59.1 defines the map that carries these designations: “Flood Insurance Rate Map (FIRM) means an official map of a community, on which the Federal Insurance Administrator has delineated both the special hazard areas and the risk premium zones applicable to the community. A FIRM that has been made available digitally is called a Digital Flood Insurance Rate Map (DFIRM).” (44 CFR 59.1)

Current-definition check

The eCFR reader page displays two separate currency signals, both visible without leaving the page:

1. Title-wide banner. At the top of the page, eCFR shows: “Displaying title 44, up to date as of 9/03/2026. Title 44 was last amended 6/22/2026.” (44 CFR 59.1) This tells you how recently the entire title (not just this one section) was refreshed against the Federal Register.
2. Section-level Federal Register credit. Below the section text, eCFR prints the original codification citation for § 59.1 itself: “[41 FR 46968, Oct. 26, 1976]” (44 CFR 59.1). The page also notes: “For Federal Register citations affecting § 59.1, see the List of CFR Sections Affected…” (44 CFR 59.1), which is where any later amendment to this specific section would be listed.

Reading both lines together — the title-wide “up to date as of” date and the section’s own printed FR credit — is how you distinguish “this entire title was recently checked against the Federal Register” from “this particular section’s definitions were themselves amended recently.”

What this article does not answer

This article only restates the definitions printed in 44 CFR 59.1 and explains how to read the eCFR page’s own currency signals. It does not say where any special flood hazard area boundary runs for any address — that information lives on a dated Flood Insurance Rate Map panel, which is a separate record from the regulatory text discussed here. It does not say whether any specific property is inside a special flood hazard area. It does not address whether flood insurance is needed, advisable, or required for any specific property, and it does not address what any flood insurance policy would cost. It also does not report the eCFR API’s internal section-scoped amendment-tracking values (such as a distinct amendment date separate from the printed Federal Register credit line above), because those values are only visible through a separate versioner API and are not displayed on the reader page itself.

Source links

• https://www.ecfr.gov/current/title-44/section-59.1