What Chantal did here
Tropical Storm Chantal came ashore in South Carolina on July 6, 2025, and its remnants stalled over the northwest part of the Raleigh-Durham area. The National Hurricane Center's report says spots of "greater than 10-inch rainfall totals" were observed "near Chapel Hill," with most of the rain falling in a 6–9 hour period. Several locations in the region exceeded their 1,000-year recurrence interval for 6-hour rainfall.
The NHC lists evacuations in Chapel Hill and Durham, and says 50 people were rescued from floodwaters in Chapel Hill. It called Orange, Durham and Chatham the hardest-hit counties, with "several apartments and residential homes flooded" in Orange County. Seven years earlier, the NHC named Chapel Hill among the cities inundated by Hurricane Florence (September 2018). Local news has also reported repeated flooding along Bolin Creek over the years.
None of that means a given home has mold. It does mean that wet drywall, carpet and crawl space insulation from 2025 are worth a second look if anything still smells musty.