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The Flood Zone Shift

When FEMA redraws a flood zone boundary, it changes what homeowners pay for insurance, what their property is worth, and whether they can get a mortgage. These decisions happen quietly and affect millions — but most residents only find out when the bill arrives.

Body / subject: The Flood Zone Shift

Data / source: FEMA Changes Since Last FIRM (CSLF)

First published: date not yet reconciled · Updated Feb 11, 2026

The Flood Zone Shift

Read this in the original

This entry provides context and source notes. Its detailed explanation remains in the original build; a separate visual breakdown has not yet been authored here.

  1. Start with the question and coverage below.
  2. Open the original to inspect the records, controls and evidence behind the finding.
  3. Check the source dates and methodology before comparing figures or drawing a conclusion.
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What you’re looking at

An editorial investigation of FEMA flood zone reclassifications across the Houston metro area — which neighborhoods saw risk increase, which saw decreases, and what it means for insurance premiums and property values.

The question behind it

This investigation maps the geography of FEMA flood zone reclassifications across Houston metro counties (Harris, Fort Bend, Montgomery), revealing how federal risk redrawing reshapes insurance costs, property values, and neighborhood vulnerability. Built from FEMA CSLF and NFHL data with real-time address lookup.

Why it matters

When FEMA redraws a flood zone boundary, it changes what homeowners pay for insurance, what their property is worth, and whether they can get a mortgage. These decisions happen quietly and affect millions — but most residents only find out when the bill arrives.

Open the full visualization

Sources & method

  • FEMA Changes Since Last FIRM (CSLF)
  • FEMA National Flood Hazard Layer (NFHL)
  • FEMA Pending NFHL
  • FEMA Risk Rating 2.0 Premium Data

Method

Real-time FEMA CSLF API queries for SFHA change polygons across Houston metro counties. Address lookup queries both effective and pending NFHL layers. Insurance estimates from FEMA Risk Rating 2.0 ZIP-level medians. 46,676 total zone change records, 653 mapped GeoJSON features.

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