You can only rely on a previous determination if it is:
1. On the SFHDF,
2. Less than 7 years old,
3. There have been no map changes.
ALL three of the above must be answered yes. If any of them are answered no then a new determination is required.
LOL monitoring is an optional service and has no bearing on the regulatory requirement.
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The opinions expressed are mine and they are not to be taken as legal advice.