Water damage starts within minutes and becomes serious within hours. A burst supply line can soak a room before you reach the shutoff valve. A slow leak takes longer, but by the time you see it, the damage inside the wall is usually well along.
The water damage timeline
| When | What happens |
|---|---|
| First minutes | Water spreads across floors and wicks into carpet, baseboards and drywall |
| First hours | Drywall swells, wood floors start to cup, furniture and cabinets absorb water |
| 24 to 48 hours | Mold can begin to grow on wet materials, according to the EPA |
| Days | Odors build, paint bubbles, metal rusts and clean water can become contaminated |
| Weeks | Framing and subfloors weaken, flooring fails and mold spreads widely |
Clean water doesn't stay clean. Under the IICRC S500 standard, water that sits can move from Category 1 to Category 2 or 3 as bacteria grow, which makes cleanup harder and more expensive.
The fastest sources in Arizona homes
- Burst supply lines under sinks and toilets, especially older braided or plastic lines.
- Water heater failures in garages and closets.
- Washing machine hose breaks.
- Monsoon storms that push water through roofs, windows and doors in under an hour.
- Frozen pipes in the high country, where a split line can run for hours before anyone notices.
Slow leaks do damage too
A slab leak or a dripping AC drain line won't flood a room, but it keeps materials wet day after day. That is long enough for mold, rot and failed flooring. Warm spots on tile, a rising water bill or a musty smell are often the only early signs.
What to do in the first hour
- Shut off the main water valve. Learn where it is before you need it.
- Turn off power to wet areas at the breaker if you can reach it safely.
- Move people, pets and valuables out of the wet area.
- Take photos and video for your insurance claim.
- Call for emergency water extraction.
Don't wait to see if it dries on its own. The EPA advises drying water-damaged materials within 24 to 48 hours to prevent mold. Arizona Water Damage Pros answers calls 24/7 in Phoenix, Tucson and communities across the state.