Johnson County, GA Flood Zone & Flood Risk Data
Johnson County, GA: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Johnson County scores at the 11th percentile for flood hazard, rated "Very Low", among the lowest flood hazard in the country. The hazard here is driven by inland rivers and flash flooding rather than the coast, FEMA's model puts a flood event here at about once every 4 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Johnson County
Homes with a federally backed mortgage inside Johnson County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 6.3% of them do, 2 active policies against 32 structures FEMA counts in that zone, leaving a real compliance gap. Looking beyond the mandated zone, 0.1% of all residential structures in Johnson County carry flood coverage voluntarily or otherwise, relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Johnson County ranks
Among the 3144 US counties FEMA scores for flood hazard, Johnson County ranks 2817, 1 being the highest hazard nationally, and 2474 by population among all 3144 counties covered here, where 1 is the largest. About 9,178 people live in Johnson County, Georgia, spread over 303.019 square miles.
What to do next if you own or are buying in Johnson County
2 of Johnson County's 4,081 residential structures carry flood coverage of some kind, per FEMA's latest count, useful context, not a substitute for checking one parcel.
Where Johnson County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.