The first hour after a flash flood or burst pipe

Updated October 27, 2026. By Las Vegas Flood Restoration.

The first hour after a flash flood or burst pipe decides how much has to be torn out later, because EPA says water damaged areas should be dry within 24 to 48 hours to prevent mold growth.

The first hour, minute by minute

Clock	Action	Why
0 min	Get people out of the water	Do not walk or drive through moving water. Ready.gov says six inches of moving water can knock you down and one foot can sweep a car away.
2 min	Stop the source if you safely can	For a pipe, close the main shutoff. LVVWD says it is usually in the front yard near the sewer riser cap, in the garage or at the home's manifold.
5 min	Keep away from wet power	Ready.gov says not to touch electrical equipment that is wet or while you stand in water. Leave the breaker panel alone if the floor around it is wet.
10 min	Call or text (702) 602-9420	Tell us where the water came from, which rooms are wet and whether it came in from outside. That decides the crew and the gear.
15 min	Photograph everything before it moves	Wide shots of each room, close shots of the water line on walls, and the source. Your insurer will ask for these.
30 min	Lift and separate	Move rugs, boxes and furniture off wet floors. Put foil or wood blocks under furniture legs that must stay.
45 min	Treat flood water as dirty	Floodwater can be contaminated, per Ready.gov. Wear gloves and boots. Keep children and pets out.
60 min	Start the 48 hour clock	EPA says to dry water damaged areas and items within 24 to 48 hours to prevent mold growth. Extraction and drying should start inside that window.

Table. The first hour. Ready.gov for safety, LVVWD for the shutoff, EPA for the drying window.

Flash flood or pipe, what changes

The steps look alike. The water does not. Here is where they split.

Question	Flash flood from outside	Burst or leaking pipe inside
How to stop it	You cannot. Get clear and wait for the water to drop.	Close the main shutoff. LVVWD says it is usually in the front yard near the sewer riser cap, in the garage or at the manifold.
Is the water clean	Treat it as contaminated, per Ready.gov.	Supply line water starts clean. Drain and toilet water does not.
What usually comes out	Carpet, pad, insulation and wall bottoms it soaked	Only what reads wet past the drying target
Which policy	Flood policy. Standard homeowners policies do not cover flood, per the Nevada Division of Insurance.	Homeowners policy, for sudden and accidental discharge under most forms
When it happens	Mostly July and August, per the NWS	Any month

Table. Two kinds of water, two different first hours.

What not to do

Do not drive into a flooded street or wash. Ready.gov says one foot of moving water can sweep a vehicle away.
Do not touch electrical equipment that is wet or while you stand in water, per Ready.gov.
Do not go back into a flooded home until authorities say it is safe.
Do not throw out damaged items before you photograph them.
Do not turn off drying gear at night once it is running.

What to photograph for the claim

A wide shot of each wet room from the doorway
The water line on the walls, with something for scale
The source, a split line, a failed heater, the door the water came under
Serial plates on damaged appliances
The outside, if water came from the street or yard

Our claim help page explains what the adjuster will ask for.

Why the clock matters in Las Vegas

The NWS describes monsoon storms that form over the mountains, move into the valley and send flash floods down normally dry washes. On July 8, 1999, most of the rain fell in 90 minutes. Water moves fast here and so should the response. Inside a home, most water comes from plumbing, and LVVWD rates the water at about 16 grains per gallon, very hard, which builds scale in heaters and fixtures over time.

Questions

How urgent is a burst pipe?

Very. Water keeps coming until the valve closes, and EPA says to dry water damaged areas within 24 to 48 hours to prevent mold growth.

Where is the main shutoff in a Las Vegas home?

LVVWD says it is usually in the front yard near the sewer riser cap, in the garage or in the home's manifold system.

How deep does moving water have to be to knock me down?

Ready.gov says six inches of moving water can knock you down and one foot can sweep a vehicle away.

Should I turn off the power?

Not by stepping into water to reach the panel. Ready.gov says not to touch wet electrical equipment or touch it while standing in water.

When can I go back in after a flash flood?

Ready.gov says to return home only when authorities say it is safe.

Does homeowners insurance cover a burst pipe?

Many forms cover sudden and accidental discharge but not the repair of the pipe, and some exclude seepage that lasted a week or more. Read your form.

Sources

Water in the house right now? Call or text (702) 602-9420.

Call (702) 602-9420 Text a photo