Water Damage: What to Do in the First 24 Hours
Mold can begin colonizing wet drywall in 24–48 hours. That gives you roughly one day to stop the source, document the loss, and get drying started — here's the hour-by-hour playbook restoration pros follow.
Hour 0–1: stop, protect, document
- Stop the source — main water shutoff for plumbing, tarps for roof leaks (our storm damage guide covers roofs).
- Cut power to affected circuits before stepping into standing water.
- Photograph and video every room, angle, and damaged item before touching anything.
- Note the water source — clean supply water, gray appliance water, or sewage changes both the safety rules and the cleanup cost.
Hour 1–4: remove water and start airflow
Extract standing water with a wet/dry vac, pull up rugs, and get air moving with every fan you own plus a dehumidifier if you have one. Open interior doors and cabinet doors in wet areas. Don't run the HVAC if ducts may have taken water — you'd be distributing moisture through the house.
Hour 4–24: call insurance and mitigation
Report the claim the same day — policies require prompt notice, and delay is a common denial reason. Then get a mitigation company on site: professional drying with commercial dehumidifiers and air movers, placed within 24 hours, is the difference between drying walls in place and demolishing them later. Insurers expect you to take “reasonable steps to prevent further damage” — mitigation is that step, and it's typically covered.
| Scope | Typical cost |
|---|---|
| Clean-water extraction & drying, 1–2 rooms | $1,000 – $4,000 |
| Gray water cleanup + affected material removal | $3,000 – $8,000 |
| Sewage (black water) cleanup | $7,000 – $25,000+ |
| Mold remediation if drying was delayed | $1,500 – $9,000 |
| Rebuild (drywall, flooring, paint) | Varies by scope |
What not to do
- Don't throw damaged items away before the adjuster documents them
- Don't seal or repaint water-stained drywall before moisture readings confirm it's dry inside
- Don't sign a contractor's “assignment of benefits” without reading it — you may be signing away control of your claim
- Don't assume dry-to-the-touch means dry — moisture meters routinely find wet framing behind dry-feeling walls
Hidden moisture is the expensive mistake: water wicks up inside wall cavities and under flooring far beyond the visible stain. Insist on moisture-meter readings before any company declares the job done.
Frequently asked questions
How fast does mold grow after water damage?
Mold can begin growing on wet drywall, wood, and carpet within 24–48 hours in warm conditions. Professional drying started inside the first day usually prevents it; waiting past 72 hours often turns a drying job into demolition and remediation.
Does insurance pay for water damage restoration?
Sudden events — burst pipes, appliance failures, storm intrusion — are typically covered, including extraction, drying, and rebuild. Gradual leaks, seepage, and flood (rising water) are excluded; flood requires a separate policy. Document everything and report promptly.
Can I dry out water damage myself?
Small clean-water spills caught immediately, yes — extract, ventilate, dehumidify. But water that reached walls, wood flooring, or sat overnight needs commercial drying equipment and moisture verification. Sewage or contaminated water should always be professionally handled.