What to do in the first hours after exterior floodwater or storm surge enters your home — and how contamination-safe cleanup differs from a clean-water pipe break.
Shut off power at the breaker if it's safe to reach, and keep children and pets out of wet areas. Never touch a fallen power line or enter standing water near an electrical source.
Waterline height, entry points, and damaged contents — before anything is moved or discarded. This documentation is what your adjuster reviews first.
High-volume extraction is the priority. Every additional hour of standing water raises contamination risk and the odds porous materials can't be saved.
Moisture meters, not a hand on the wall, confirm when a structure is actually dry enough to rebuild without trapping moisture behind new finishes.
The CDC advises against direct contact with floodwater and recommends rubber boots, gloves, and eye protection during any cleanup, since floodwater can carry bacteria and chemical contamination.
The IICRC S500 standard sorts water damage into three categories, and the category dictates the entire cleanup approach. Category 1 is clean-source water — a supply line break — and poses low health risk if addressed quickly. Category 2, or gray water, includes appliance discharge and carries measurable contamination. Category 3 covers sewage backups and exterior floodwater, and most storm-surge or overland flooding on Long Island's South Shore and East End defaults to this classification.
Water doesn't stay in one category. Clean water left standing 24–48 hours in warm, humid conditions degrades as bacteria multiply and building materials begin to break down — which is exactly why response speed matters as much as technique.
Demolition decisions. Porous materials that absorbed Category 3 water — drywall, carpet padding, fiberglass insulation, particleboard — generally can't be decontaminated and have to come out. Cuts are typically made well above the visible waterline to account for capillary wicking. Non-porous materials like concrete, solid framing lumber, and metal can often be cleaned, treated, and dried in place.
The mold window. The EPA and CDC both cite 24–48 hours as the window in which mold colonization becomes likely on wet materials in warm, humid conditions — a guideline, not a guarantee, but the reason rapid extraction is the single highest-leverage step in any flood response.
Sources: EPA, CDC, Guidelines for Cleaning Safely After a Disaster
Not always, but it should be treated as potentially contaminated until classified. Most exterior flood events on Long Island — storm surge, overland flooding — default to Category 3 under IICRC standards.
Standard homeowners policies generally exclude damage from rising exterior water. That requires separate flood coverage, most commonly through the National Flood Insurance Program (NFIP). If the water intrusion came from a covered peril inside the home — a burst pipe, for instance — standard coverage may apply instead. Confirm your specific policy language with your carrier.
Most residential mitigation — extraction, demolition, drying — runs 5–10 days. Larger or contaminated losses can extend past two weeks, with reconstruction as a separate phase after that.
Call for contamination-safe extraction and immediate stabilization.