What to Do in the First 10 Minutes of a Plumbing Emergency
A calm, ordered checklist for burst pipes, overflowing toilets, water heater leaks and sewage backups, covering shutoffs, safety, photos and when to call a plumber.
In the first ten minutes of a plumbing emergency, do four things in this order: make sure everyone is safe, stop the water, limit the damage, and document it. Only then start calling plumbers. Doing it in that order usually lowers both the damage and the final bill, because a controlled leak often turns an after-hours emergency into a scheduled repair. If you smell gas, see sparks, or water is touching electrical outlets or the panel, leave the area and call 911 or the gas utility from outside before doing anything else.
Step 1: Safety first (about one minute)
Ask three questions before touching anything:
- Is there a gas smell or hissing? Leave immediately, do not flip switches, and call 911 or your gas utility from outside.
- Is water near electricity? Do not stand in water and touch outlets, appliances or the panel. If you can reach the breaker panel without crossing wet floor, turning off power to the wet area is wise; if not, call an electrician or the utility.
- Is it sewage? Avoid contact, keep children and pets away and ventilate. Sewage carries bacteria and is a health hazard.
Step 2: Stop the water (two to three minutes)
Work from the nearest shutoff to the main.
| Situation | First shutoff to try | If that fails |
|---|---|---|
| Leaking faucet supply line | Small valve under the sink | Main shutoff |
| Toilet overflowing | Valve behind the toilet, turn clockwise; lift tank lid and lift the float to stop refill | Main shutoff |
| Washing machine hose burst | Valves behind the machine | Main shutoff |
| Water heater leaking | Cold water inlet valve on top of the heater | Main shutoff |
| Pipe burst in wall, ceiling or basement | Main shutoff | Call plumber and the water utility |
Finding the main shutoff: it is usually where the water line enters the house: in a basement, utility room, garage or crawlspace, or in a ground-level box near the water meter outside. Turn a round handle clockwise until it stops; a lever handle closes when perpendicular to the pipe. Many people never test their main valve until the emergency, and old valves can be stuck, which is why the prevention advice in preventing plumbing emergencies includes exercising it once a year.
If you cannot close any valve, your water utility can shut off at the street, though response varies. Call the number on your water bill.
Step 3: Limit the damage (three to four minutes)
- Open a faucet at the lowest point in the house to drain remaining water from burst supply pipes, and a high faucet to let air in.
- Turn off the water heater if the heater is affected or if the water supply to the house is off (an electric heater with no water can burn out its elements; gas units can be set to pilot or off according to the label).
- Move belongings: lift rugs, electronics, paper and furniture legs out of the water.
- Soak up and divert: towels, mops, a wet-dry vacuum and buckets. For a ceiling leak with a bulge, carefully puncturing the lowest point of the bulge into a bucket can relieve pressure and prevent a collapse, but stay out from under it and avoid doing so near light fixtures or if power cannot be shut off.
- Increase airflow: fans and open windows, if the weather allows, to start drying. Mold can begin to develop within a day or two of persistent moisture, which is why quick drying matters.
Step 4: Document (one to two minutes)
Take wide photos and close-ups of the source, the water and any damaged items, plus a short video walkthrough. Note the date and time you discovered the problem and what you did. This record supports an insurance claim, a landlord report or a dispute with a contractor. See does homeowners insurance cover a plumbing emergency.
Step 5: Decide who to call
After the water is controlled, decide how urgent the repair is.
- Active water you cannot stop, sewage backing up, no water or heat in freezing weather: call an emergency plumber now.
- Water stopped, no ongoing damage: call for the first standard appointment and compare prices. You may avoid an after-hours premium. The guide on after-hours rates explains why.
- Rental: notify the landlord or property manager in writing first. See renters and landlords.
- Gas smell: gas utility or 911, not a plumber first.
Before you commit to a company, run through the emergency plumber checklist and the questions in what to ask an emergency plumber.
Problem-specific tips
Overflowing toilet: stop the refill by lifting the float or closing the valve. Do not flush again. A plunger can clear many clogs; if multiple fixtures are backing up, the problem is in the main line, not the toilet.
Frozen pipes: if a pipe is frozen but not burst, keep the faucet slightly open, and warm the area gradually with indoor heat or a hair dryer. Never use an open flame. If pipes have burst, close the main before thawing.
Washing machine or dishwasher leak: unplug the appliance if you can do so safely and close its supply valves.
Sewage backup: stop using water in the house, because every drain feeds the same blocked line, and call a plumber. Avoid touching contaminated material with bare hands.
What not to do
- Do not pour chemical drain cleaner into a backed-up line; it can splash back and harm the plumber.
- Do not use an open flame to thaw pipes.
- Do not touch electrical items while standing in water.
- Do not hire the first search result without checking a license. See how to find a licensed emergency plumber.
When to consult a professional
You should involve a licensed plumber for anything involving gas, the main sewer line, water heater replacement or pipes inside finished walls. Involve an electrician if water has reached outlets or the panel. Involve your insurer if damage is significant. These are time-sensitive and not suited to improvised fixes.
Frequently asked questions
Should I shut off the main even for a small leak?
If you cannot isolate the leak with a fixture valve, yes. Closing the main is free and reversible, and it prevents a small leak from becoming a large one.
Should I turn off the electricity?
Only if you can reach the panel safely without standing in water. If in doubt, stay away and call a licensed electrician or your utility.
How soon should I call my insurance company?
As soon as damage is significant, and ideally before starting major cleanup other than steps needed to prevent further damage. Keep receipts for emergency measures.
What if I cannot find the main shutoff?
Call your water utility, which can close the supply at the street. Then locate and label the main shutoff for next time.
Sources and where to verify
- Federal Emergency Management Agency — flood and water damage recovery guidance
- U.S. Environmental Protection Agency — mold and moisture guidance
- U.S. Consumer Product Safety Commission — safety information on gas appliances and carbon monoxide