Water Damage Restoration & Mold Remediation in Jacksonville, FL

Jacksonville gets about 52 inches of rain a year, more than half of it from June to September (NOAA climate normals), and the city's own flood pages say the most common flooding comes "during the rainy season from June to November" with the most serious threat in hurricane season; Duval County "is home to coastal, inland, and river flooding" (City of Jacksonville; City of Jacksonville). The river is the difference. The St. Johns flows north, drops less than 30 feet over 310 miles, and is tidal so far upstream that the tide reverses its flow 161 miles from the mouth (St. Johns River Water Management District), so when wind, tide and rain line up, the water has nowhere to go.

Hurricane Irma in September 2017 showed what that means: with a nor'easter, high tides, river surge and 9 inches of rain at the airport all at once, the St. Johns crested downtown at 5.57 feet, an all-time record that beat Hurricane Dora's 1964 mark, and about 350 people were rescued from the water in Riverside, San Marco and downtown (NWS Jacksonville). Milton in October 2024 put about 3 feet of surge along the St. Johns and the coast and sent a tributary to a new record (NWS).

The housing stock matters too. More than a third of Jacksonville's homes predate 1980 (US Census, ACS 2024), and in the historic neighborhoods, Springfield, Riverside, Avondale, the framing sits on brick pier foundations with lattice or pierced-brick infill so the underside can ventilate (City of Jacksonville historic preservation guidelines). That crawl space is where river water and summer humidity collect, and where a leak runs unseen. Everywhere else, the everyday causes are a clogged air conditioner condensate line overflowing into a ceiling, a supply line or water heater letting go, and a roof that leaked in the last storm.

Jacksonville mornings average 88% relative humidity, rising to 92% in September (NCEI climate normals). The EPA's guidance is that wet materials dried within 24 to 48 hours usually won't grow mold (EPA); in a North Florida summer, under a raised floor that never dries, or in a house that sat without power after a storm, that window closes fast.

Florida licenses mold work. Assessment and remediation of growth over 10 square feet are licensed professions, and the same company cannot assess and then remediate the same property within 12 months. Our mold remediation and mold inspection pages explain what that means for you and how to check a license.