A burst pipe is one of the fastest-developing household emergencies there is. Water pours out at full supply pressure — often 60 to 80 PSI — until someone shuts it off or the supply runs dry. In the time it takes to figure out what's happening, you can have hundreds of gallons of water in places it was never meant to go.

If you're dealing with a burst pipe in O'Fallon or anywhere in St. Charles County, here's what to do right now — and when to call.

Step 1: Shut Off the Water Immediately

The single most important thing you can do is stop the flow. Find the shutoff valve closest to the break:

• Under-sink valve — for supply lines under a sink or to a toilet
• Water heater shutoff — for lines near the water heater
• Main shutoff — for everything else. In most O'Fallon homes, the main shutoff is near where the water line enters the house, typically in the basement, utility room, or crawl space. There's also a shutoff at the street meter, but the indoor valve is usually easier to reach.

Know where your main shutoff is before you need it. This is one of those things that matters the moment you need it and there's no time to look it up.

Step 2: Turn Off Your Water Heater

If the main water supply is off, the water heater is no longer receiving cold water. Running it dry can burn out the heating element or damage a tankless unit. Switch it to "vacation" or "pilot" mode, or shut it off entirely at the breaker or gas valve.

Step 3: Open a Faucet to Relieve Pressure

Open a cold-water faucet on the lowest level of the house. This drains remaining water from the pipes and reduces pressure in the system. It also helps you confirm the main shutoff is working — if water continues flowing freely, the valve may not be fully closed.

Step 4: Document the Damage

Before cleanup begins, take photos and video. Your homeowner's insurance will want documentation. Capture the pipe failure, any standing water, and any visible damage to walls, floors, and belongings.

Step 5: Start Damage Control

Move what you can out of affected areas. Lay down towels or use a wet/dry vac to pull up standing water. Open windows and run fans if weather permits — the faster you reduce moisture, the less likely you are to have a mold problem within the next 24–48 hours.

Do not use electrical outlets or switches in affected areas until an electrician confirms it's safe.

Step 6: Call a Plumber

A burst pipe is not a temporary-patch situation. The failed section needs to be cut out and replaced. Our emergency plumbing team covers O'Fallon and all of St. Charles County. Our technicians do not work on commission — you get honest pricing on what the repair actually requires, not an inflated emergency premium. Many home service companies handle emergencies differently. We don't.

What Causes Burst Pipes?

• Freezing temperatures — the most common cause in Missouri. Water expands as it freezes, and the pressure ruptures the pipe wall.
• Excessive water pressure — anything over 80 PSI stresses pipe joints and fittings over time until something fails.
• Corrosion — galvanized steel and older copper pipe corrode from the inside. A pinhole leak can rapidly become a rupture.
• Physical damage — pipes hit during renovation work or damaged by settling foundations.

FAQ

What's the fastest way to stop water from a burst pipe?
Shut off the nearest shutoff valve — under a sink, at the toilet, or at the main if needed. If you can't find a closer valve, go straight to the main shutoff. Every second matters when water is flowing at full pressure.

Can I use a temporary repair kit while I wait for a plumber?
Products like pipe repair clamps or self-fusing silicone tape can slow a leak temporarily, but they are not reliable repairs and won't hold at full pressure. Use them only to buy time while help is on the way — never as a permanent fix.

How serious is water damage to walls and floors from a burst pipe?
Very. Water can saturate drywall in minutes, reach wall insulation and framing within hours, and create mold conditions within 24–48 hours. Structural damage from prolonged exposure can be significant. The faster the water is stopped and the area dried, the lower the restoration cost.

Can a pipe burst without freezing temperatures?
Yes. Excessive water pressure, severe corrosion, physical damage, and manufacturing defects can all cause a pipe to burst regardless of season. Summer burst pipes are not unusual in older St. Charles County homes.

How long does burst pipe repair take?
A straightforward section replacement on an accessible pipe typically takes 1–3 hours. If the break is inside a wall or under a floor, additional time is needed for access. Wall or floor repair after the plumbing fix is a separate scope of work.

Call to Action

If you have a burst pipe in O'Fallon or anywhere in St. Charles County, call AAA Home Services now. We provide emergency plumbing repair with honest pricing and no commission-driven pressure to upsell.

Request emergency service — we'll get to you as fast as possible.