Start with the status. Draft is not final.

As of May 23, 2026, Harris County's MAAPnext site describes the maps as draft. They are being shared for awareness and education. They are not final, they are not open for formal appeals yet, and they cannot be used for insurance rating or regulatory decisions.

FEMA is expected to release Preliminary Flood Insurance Rate Maps after its federal review and publishing process. After that release, FEMA starts the formal public review and appeal period. A Harris County Flood Control District update to Commissioners Court described final determination and effective maps as an estimated 2028 to 2029 step, with the schedule still dependent on FEMA review.

Use the draft maps as an early warning. Do not use them as the only reason to buy or skip flood coverage. A map line can move after public review. Your slab elevation, drainage, watershed, street history, and storm pattern are already real.

Houston's flood problem is bigger than the map line.

FEMA maps matter. Lenders use them. Cities and counties use them. Buyers, sellers, engineers, builders, and insurers all pay attention to them. But Houston homeowners learned during Harvey that the map is not the same thing as the water.

Harris County Flood Control District says it can flood anywhere in Harris County, and that flooding can happen from multiple sources. Community flooding can occur when rainfall overwhelms storm sewers, roadside ditches, and local drainage infrastructure. Riverine flooding can occur when bayous and creeks exceed capacity. Coastal flooding can come from high tides driven by tropical systems.

That matters because many Houston homes do not flood from one neat source. A home can sit outside the current Special Flood Hazard Area and still be exposed to sheet flow, local drainage backup, detention overflow, upstream development, or a bayou system that behaves differently than the old model expected.

The proposed maps are a catch-up document. They reflect better rainfall data, better elevation data, better modeling, and a harder-earned understanding of Harris County after Harvey. They still do not replace property-specific coverage judgment.

What changes when a home moves into the high-risk zone.

The biggest practical change is usually the mortgage requirement. Under federal law, a property in a Special Flood Hazard Area with a federally backed mortgage must carry flood insurance. If the proposed maps become effective and your property moves into the high-risk area, the lender may require coverage.

The premium conversation is more nuanced. NFIP Risk Rating 2.0 uses property-specific factors and not the map line alone. That means a map change is not automatically the same thing as a premium shock. It can still create a new lender requirement, a new closing conversation, a new buyer concern, and a new reason to review the coverage before the lender forces it.

What Charles would look at before the next storm.

A flood coverage conversation should not stop at the FEMA zone. It should connect the map to the house, the street, the watershed, the policy, and the claim-time math.

• Current and draft map position. Compare the current FEMA map with the draft MAAPnext result and save the address-specific report when available.
• Local water behavior. Look at street ponding, roadside ditches, storm drains, detention ponds, low thresholds, and where water actually moves during heavy rain.
• Past neighborhood flooding. Ask what happened during Harvey, Imelda, the May 2024 derecho, Beryl, and other heavy rain events. Street flooding still matters even when living rooms stayed dry.
• Policy structure. Compare NFIP and private flood insurance, then check building limits, contents limits, waiting periods, loss of use, replacement cost, and exclusions.
• Home policy gaps. Standard homeowners insurance generally excludes flood. Review water backup, seepage, foundation, and drainage language on the home renewal too.

Use the map. Then read the contract.

These pages help turn a flood map question into a coverage decision.

Sources worth opening before you decide.

This article uses public source material from Harris County MAAPnext, the MAAPnext flood risk guide, FEMA preliminary map products, FloodSmart, and Rice University's Baker Institute and Kinder Institute coverage of the Redrawing Risk conference.

The purpose is not to replace FEMA, Harris County, an engineer, a lender, or the policy contract. The purpose is to help a Houston homeowner ask better questions before claim time.