Mold in Walls & Drywall in Riverview, FL

My house is less than 20 years old. How did mold get into the wall?

Riverview's housing is young: the median home was built in 2006, and only about 7 percent of units date from before 1980. New construction doesn't stop water, though. The usual sources in a newer slab home are a supply line fitting behind a vanity or refrigerator, a washer hose, a shower valve, an AC condensate line that clogs, or a window that lets in wind-driven rain. Because modern drywall is painted on the room side, moisture can feed growth on the back surface for weeks before anything shows. A musty closet, paint bubbles low on a wall, or baseboards that separate are the early hints.

What if the Alafia River flooded my street?

The Alafia runs through the northern part of Riverview. During Hurricane Helene in 2024, homes on Parkway Circle along the river took up to five feet of water, and residents said the flooding was higher than usual. With water that deep, drywall and insulation are saturated well above the water line. EPA's post-disaster guidance says to assume mold growth when a flooded home couldn't be dried within 24 to 48 hours, which means the lower drywall, insulation and baseboards usually come out. Flood damage generally needs flood insurance, since standard homeowners policies don't cover it.

Do I need a permit to put the walls back?

Riverview is unincorporated, so Hillsborough County Development Services handles permits. County storm-recovery guidance says drywall removal and replacement is cosmetic and doesn't need a permit, though a Substantial Damage packet still has to be submitted after a storm. Structural repairs in a Special Flood Hazard Area do need a permit, and repairs reaching half of a home's market value trigger substantial-damage rules. Confirm with the county before you rebuild.

One more local note

About 8 percent of Riverview homes are mobile homes, where interior wall panels are thin and usually replaced rather than cleaned, and roughly a quarter of occupied homes are rented. Renters with an unrepaired leak can contact Hillsborough County Code Enforcement. For testing or a clearance check, Florida law keeps the mold assessor and the remediation company on a given house separate for 12 months.