A Homeowner's Plumbing Emergency Checklist

Why the first few minutes matter.

A plumbing emergency rarely gets worse slowly. A burst pipe or a failing water heater can go from a small problem to real water damage within an hour, which is why what you do before a technician arrives genuinely affects the outcome, not just your stress level in the moment.

If it's a burst or leaking supply pipe.

Shut off the main water valve first, not just the fixture nearest the leak. Most homes have a main shutoff near the water meter or where the line enters the house. If you don't know where yours is, this is worth finding out before an emergency, not during one.

After the water is off, avoid using electrical outlets or switches in the affected area if water has reached them. Move valuables and electronics away from the wet area while you wait.

If it's a water heater leak.

Shut off the cold water supply valve at the top of the tank, then the gas or electrical supply to the unit if you can safely reach it. Don't attempt to drain or move the unit yourself, a full tank is heavy and the fix depends on diagnosing the actual failure first. See our water heater repair page for what typically causes this.

If it's a sewage backup.

Stop using all drains and toilets in the house immediately, since continued use pushes more water into an already-blocked system. Avoid contact with the affected water, and don't attempt to clear a main line blockage yourself, this is exactly the situation a sewer line or drain professional should assess first with a camera before any DIY attempt makes things worse.

If active water damage has already started.

Move furniture and belongings out of standing water where it's safe to do so, and avoid walking through water near outlets or a breaker panel. Fast extraction and drying meaningfully limit what needs to be replaced versus dried and saved, so don't wait to call once the immediate safety steps are handled.

What to have ready when you call.

A quick description of what's happening, when it started, and whether you've already shut off water or power helps a technician prepare before arriving. Having your address and the best callback number ready also speeds up dispatch, especially for an after-hours emergency call.

After the emergency: what happens next.

Once the immediate situation is stabilized, water off, safety steps taken, a technician will diagnose the actual cause rather than just patching the visible symptom. For anything involving water damage to flooring, drywall, or belongings, that's typically a separate conversation from the plumbing repair itself.

Keep photos of the damage and a rough timeline of what happened for your own records, whether or not you end up filing an insurance claim. It's easier to document in the moment than to reconstruct later.

Building a simple home emergency plan now.

The best time to locate your main shutoff valve, test that it actually turns, and save your plumber's number in your phone is before anything is wrong, not during a crisis. A five-minute walkthrough of your home's key shutoffs, water, gas, and electrical, is worth doing once and remembering. Any repair that follows an emergency still needs to meet California Plumbing Code standards, not just a fast patch.

Consider keeping a small emergency kit near the water shutoff: a towel, a flashlight, and the contact information for whoever you'd call, so you're not searching for basic supplies while water is actively spreading.

Common mistakes people make during a plumbing emergency.

Trying to fix the problem yourself before shutting off water often makes things worse, since continued water flow while attempting a repair usually increases the damage rather than limiting it.

Waiting to call because it's outside normal business hours is another common mistake. A real emergency, active flooding, a burst pipe, a sewage backup, is exactly what 24/7 dispatch exists for, and waiting until morning typically costs more in the end than an after-hours call would.

Common questions.