How to Shut Off Your Water Main During an Emergency
By the Des Moines Water Damage team · September 17, 2026
Knowing where your home's main water shutoff valve is — and confirming it works — before an emergency happens can save you from major water damage. Most homes have it near where the water line enters the house, often in a basement, crawl space, or utility closet.
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Why This Matters Before an Emergency
When a pipe bursts or a fixture fails, the first and most important step is stopping the water at its source. Fumbling to find the shutoff valve during an active leak wastes precious minutes and lets more water spread — which is why it's worth locating yours now, before you need it.
Where to Look
- Basement or crawl space. In most homes, the main shutoff is near where the water line enters from the street, often close to the water meter.
- Utility closet or mechanical room. Newer homes sometimes route the main shutoff to an interior closet near the water heater.
- Near the water heater. The main shutoff is often within a few feet of the water heater, though this isn't universal.
- Outside, near the street. There's usually also a curb stop valve near the property line, though this typically requires a special tool and is meant for utility company use.
How to Shut It Off
Most main shutoff valves are either a ball valve (a lever you turn a quarter turn) or a gate valve (a wheel-style handle you turn clockwise multiple times until it stops). Turn it fully to ensure the water is completely off, then test by running a faucet — it should slow to a trickle and stop.
Test It Before You Need It
Valves that haven't been used in years can seize up or leak once turned. Testing yours during a calm moment — and knowing it works — means one less unknown during an actual emergency.
What to Do After Shutting Off the Water
Once the water is off, open a low faucet to relieve pressure in the lines, then call for a damage assessment. Shutting off the source stops new damage, but the water already released still needs extraction and drying as soon as possible.