Guide
How Online LOMC works
A guide to the online FEMA submission environment and where it fits in the process.
Online LOMC is FEMA's online submission system for Letters of Map Change. It works after the property has been routed correctly into the right request type and the supporting documents are ready.
Key takeaways
Use this guide when
Frequently asked questions
What is the Online LOMC portal?
Online LOMC is FEMA's web-based submission environment for Letters of Map Change, including LOMA and LOMR-F requests. It replaces the traditional paper package for most users and routes the submission directly into FEMA's review queue. The portal focuses on intake and document handling, not on the underlying eligibility decision.
Who can submit through it?
Property owners, licensed surveyors, engineers, and authorized representatives can all create submissions. The portal asks for contact information for the requester and, where applicable, the technical preparer. Lenders and agents typically do not file on behalf of the borrower.
Are all LOMA/LOMR-F submissions routed through Online LOMC?
Most standard LOMA and LOMR-F cases are handled through the portal today, and FEMA continues to steer requesters toward digital submission. A small number of unusual cases or legacy packages may still flow outside the portal. When in doubt, starting in Online LOMC is usually the safer default.
What file types does it accept?
The portal accepts common document formats such as PDF for forms, certificates, and correspondence, plus standard image formats for photographs and exhibits. Large technical drawings are usually submitted as PDFs. Uploads have size limits per file, so splitting very large attachments is often necessary.
How long does a digital submission take to process?
Digital submission removes mailing time but does not change FEMA's technical review clock. The portal confirms receipt quickly, while the actual determination still depends on file completeness and workload. Clean, complete files tend to move through faster than thin or inconsistent ones.
What to do if the portal rejects the upload?
Most rejections trace back to file size, file format, or a missing required field rather than the substance of the case. Reviewing the error message, splitting oversized PDFs, and confirming each required form is attached usually resolves the issue. If it keeps failing, saving a draft and contacting FEMA support is the next step.