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Glossary

Map Information eXchange (MIX)

FEMA MIX is a query system that provides access to flood map data, community information, and map change records.

The Map Information eXchange, or MIX, is a FEMA system that provides access to flood map data, community status information, and records of previous Letters of Map Change. It is a useful research tool for professionals, community officials, and informed homeowners who need to look up map panel details, community participation status, or the history of LOMC activity in an area.

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Key takeaways

FEMA MIX is a data query tool, not a map viewer — it complements tools like the NFHL and FIRMettes.
It provides community-level information including NFIP participation status and CRS class.
Past LOMC records can be searched to see if previous map changes have been issued in your area.
The system is publicly accessible but can be technical to navigate without experience.

Why it matters

Professionals use MIX to research map panel details and prior LOMC activity before starting an application.
Community officials use it to track floodplain management data and NFIP status.
Homeowners can use it to verify their community's NFIP participation and look up map panel information.

Frequently asked questions

What kind of information can I find on FEMA MIX?

FEMA MIX provides community NFIP status, CRS class ratings, map panel numbers and effective dates, previous LOMC records, and other floodplain management data. It is a research tool rather than a map viewer, so it works best alongside visual tools like the NFHL viewer or FIRMettes.

Is FEMA MIX free to use?

Yes. FEMA MIX is a publicly accessible online tool with no cost to use. You can search by community, state, county, or map panel number. No account is required for basic queries.

Can I look up past LOMAs on FEMA MIX?

Yes. FEMA MIX includes records of past Letters of Map Change, including LOMAs, LOMR-Fs, and LOMRs. This can be useful for checking whether previous determinations have been issued in your area, which may indicate that other properties on similar ground have successfully obtained map changes.

Is FEMA MIX the same as the NFHL viewer?

No. The NFHL (National Flood Hazard Layer) viewer is a map-based tool that shows flood zones visually on a map. FEMA MIX is a data query system that provides tabular information about communities, map panels, and LOMC records. They serve different purposes but complement each other.

Do I need FEMA MIX to apply for a LOMA?

You do not need to use FEMA MIX to apply for a LOMA, but it can be helpful for looking up your map panel number, effective date, and other details that are required on the application. Professionals often use MIX as part of their research before preparing a submission.