Rainwater damage cleanup in Phoenix Valley homes

When rain becomes water damage

Most of the Valley’s rain arrives in a short season. Since 2008, National Weather Service offices in the Southwest have used fixed monsoon dates, June 15 through September 30, and the NWS says about half of the region’s yearly precipitation falls from June through September. The City of Phoenix notes that the heaviest rain usually comes between mid-July and mid-August.

When it rains, it can rain hard. The NWS says the water “can accumulate very quickly, resulting in flooded streets or washes.” Two recent examples:

• September 8, 2014. Moisture from Hurricane Norbert dropped 3.30 inches at Phoenix Sky Harbor, a calendar-day record. News reports cited by NOAA said some 200 homes flooded.
• September 16, 2026. Totals from northern Pinal County through northern Maricopa County reached 2 to 4 inches, most of it within a two- to three-hour period, according to the NWS. Streets, washes and creeks flooded.

This page is about the water that gets inside your house. Repairs to the roof or the outside of the home are a separate job for a roofer or contractor. The providers you reach through this site remove the water, dry the structure, clean up and deal with mold.

How rainwater gets inside

• Through the roof. Heavy rain finds any weak spot. If your roof has drains or scuppers, debris can block them and let water pond. A roof leak shows up as a ceiling stain, sagging drywall or water dripping from a light fixture.
• Around doors and windows. Rain gets past worn seals, thresholds and window frames.
• From the ground up. Runoff from the street, the yard or a nearby wash can flow in under doors or into the garage. A clogged drywell or landscaping that slopes toward the house makes that more likely.

One heavy rain can do more than one of these. That matters, because water from above and water rising from outside are treated differently, both in the cleanup and by insurance.

Roof leak or flood: why the source matters

For the cleanup. Floodwater that comes in at ground level has run across streets and yards. The CDC notes that a flooded home may also be contaminated with sewage, so providers treat that water as contaminated and remove more of what it touched. Under the industry’s IICRC standard, rainwater coming through a roof isn’t automatically treated that way, though the provider still has to judge it. See emergency water extraction for how water types are handled.

For insurance. In general terms:

• Arizona’s Department of Insurance and Financial Institutions defines flood as water that enters the home from the outside at ground level, and says flood coverage requires a separate policy. FEMA states that most homeowners insurance does not cover flood damage.
• Rain that comes in through the roof isn’t flood under that definition. Whether a homeowners policy pays for it depends on your policy and on why the roof let water in. The NAIC notes that a homeowners policy isn’t a maintenance contract, and that repairing a roof when it begins to leak is the owner’s job.
• Flood insurance through the National Flood Insurance Program typically has a 30-day waiting period, so it has to be in place before the rain. Maricopa County notes that 1 in 4 flood insurance claims come from outside a floodplain.

If water came in both ways, photograph each one separately: the ceiling under the leak, and the water line on the walls and the doors where runoff came in. Our insurance guide covers the claim process.

What to do once the rain stops

1. Stay out of floodwater. The Flood Control District warns that six inches of water can knock you off your feet.
2. Watch for electricity. If water is dripping through a light fixture or has reached outlets, don’t touch them. Only turn off power at the panel if you can reach it from a dry spot. Otherwise, call an electrician.
3. Take photos and video of the ceilings, walls and floors before cleanup starts. Then call your insurance company.
4. Limit further damage. Put out buckets, move furniture and rugs, and have a roofer cover or repair the leak. Keep receipts for what you spend.
5. Start drying. The EPA advises drying water-damaged areas within 24 to 48 hours to prevent mold growth.

Water coming through the ceiling right now? Our guide to water through the ceiling after rain walks through it step by step.

What rainwater cleanup involves

Ceilings and attics. After a roof leak, the provider checks ceiling drywall, attic insulation and the walls below, and removes what can’t be dried. Stay out from under any ceiling that sags. There’s no point rebuilding a ceiling under a roof that still leaks, so the drying and the roof repair need to be coordinated.

Floors and lower walls. For water that came in from outside, the joint EPA and CDC homeowner guide says to throw away anything wet with floodwater that can’t be cleaned and dried completely within 24 to 48 hours. Carpet, pad, baseboards and the bottom of the drywall often come out.

Garages. Runoff often reaches the garage first. Drywall, stored boxes and anything sitting on the floor soak up water, and a water heater in the garage may need a plumber’s check once the water is out.

Drying in humid weather. University of Arizona climate researchers point out that outside air is already moist during the monsoon, which also makes evaporative coolers less effective. Providers run dehumidifiers and air movers and take daily readings. See structural drying.

Hidden mold. The EPA lists roof materials above ceilings and the back side of drywall among the places mold hides after a roof leak. If a room smells musty weeks later, see mold remediation and our signs of hidden mold guide.

Before the next rainy season

The City of Phoenix’s monsoon advice for residents:

• Clean out roof drains or scuppers so rainwater doesn’t pool.
• Clean out drywells on your property so the water has a safe place to collect.
• Repair landscaping so water runs away from the building.

If runoff tends to reach your doors, have sandbags ready before the season starts.