Emergency plumbing: the first hour

What counts as an emergency, and what can wait

Call now if water is flowing where it should not, if sewage is coming up through a drain, or if you smell gas.

A burst supply line is an emergency. Under pressure it can fill a room, soak the ceiling below, and ruin flooring and cabinets in one incident. A failed water heater tank, split washing machine hose, or pipe broken inside a wall is the same event: pressurised water you cannot stop at the fixture.

A sewer backup is an emergency. Wastewater rising in a tub, shower, or floor drain, or backing up when a toilet flushes, means the main line is not carrying waste away: a plumbing failure and a health problem, needing a professional, not a plunger and patience.

A gas smell is an emergency of a different kind. Treat it as a gas emergency first and a plumbing call second, and follow the gas protocol below before anything else.

What can wait for business hours: a slow drain that still drains, a toilet that runs on, a dripping tap, a small drip a bucket catches. Close the fixture valve if it is steady, and book at standard rates in the morning.

Stating urgency honestly gets the right response and the right price basis. Call a drip a flood and you may pay an after hours callout the job never needed. Call a burst line a small leak and you may be scheduled behind urgent work. Say where the water is, how fast it is coming, and whether you have stopped it.

The first fifteen minutes, in order

Minute one: stop the water

Find the main shutoff, usually where the water line enters the building or at the meter, and close it. For a single fixture, the valve behind or beneath it is faster. Every adult in the home should know both locations before an emergency, not during one.

Try the fixture valve first. Toilets have one low behind the bowl. Sinks have valves in the cabinet below, usually one for hot, one for cold. Washing machines have valves on the wall behind, often in a recessed box. Turn clockwise until it stops.

If it is missing, seized, or ineffective, go to the main shutoff, usually where the line enters: basement, crawl space, or utility room, often on the street facing wall, or outside in a meter box in warmer climates. Learn valve types now. A ball valve has a lever and closes with a quarter turn, ending across the pipe. A gate valve has a round wheel and needs several turns clockwise, and older ones may not close fully.

If the house valve fails, the meter valve is the last resort. It may need a meter key, and in some places only the utility may operate it. Call the utility rather than delay. Once off, open a low tap to drain pressure.

Then: electricity safety near water

If water is near outlets, appliances, or the panel, treat the breaker as part of the emergency and keep clear. Do not walk through standing water to reach a panel, touch a switch with wet hands, or unplug anything sitting in water. If you can reach the panel dry, turn off circuits for affected rooms. If in doubt, stay out and call the electric utility or fire department.

Then: protect the property

Move what water can ruin, photograph damage before you clean, and keep children and pets away from any backup that may contain sewage. Start with rugs, boxes, files, and anything stored on a wet floor. Lift furniture onto blocks if you cannot carry it out. Towels along a doorway slow water reaching the next room. Put a bucket under a ceiling drip, and keep people out from under a bulging ceiling. Do not poke it unless a professional says to.

Sewer backup: the protocol

Stop using water. Do not flush any toilet, or run the washing machine, dishwasher, shower, or taps to test for improvement. Everything sent down a drain will come up through the lowest opening it can find.

Keep people and pets clear. Sewage carries bacteria and other contaminants, and contact, splashes, and tracked footprints spread it through clean rooms. Keep shoes worn in the area there, or bag them. Wash hands and forearms after any contact, and keep children and animals out until it is properly cleaned.

Do not use chemical drain cleaners. They will not clear a blocked main line, they sit in the standing wastewater, and they endanger the plumber who opens the line. Say if any was already used, and name it. Leave cleaning until the cause is fixed, or you will clean twice. Note which drain backed up first, and whether flushing one toilet raised water in another. That helps the plumber decide what to bring.

Gas smell: leave first, call from outside

If you smell gas, leave the building. This overrides every other instruction in this guide: get everyone out now, including pets if they come readily. Do not stop for water shutoffs or belongings.

Do not use phones inside. Do not touch light switches, operate appliances, use a garage door opener, or light anything. Move well away, to the street or a neighbour's property. From outside, at a safe distance and not from the porch, call 911 or your gas utility's emergency number. Wait where responders can find you, and tell them if anyone is still inside or feels unwell.

Do not re-enter to check whether the smell faded, open windows, or turn anything off until responders or the utility declare the building safe. A fading smell may mean the wind changed, not that the leak stopped. Only then is this a plumbing matter: some gas work belongs to the utility, some to licensed plumbers or gas fitters. The responder will tell you which.

Water heater emergencies

A leaking tank

Water pooling at the base of a tank heater, or running from the tank itself rather than a joint above it, usually means the tank has failed. A failed tank tends to release more water, not less. Treat more than a slow weep as an emergency.

Shut the unit down. Close the cold supply valve on the pipe entering the top. Then turn off fuel or power: for gas, turn the control dial to off, unless you smell gas, in which case stop and follow the gas protocol. For electric, switch off its breaker if you can reach the panel dry and safely. Fit a hose to the base drain valve only if you can route it where hot water does no harm.

Discharge from the relief valve

Every tank has a temperature and pressure relief valve, on the top or upper side, with a discharge pipe running toward the floor. A valve that runs steadily, discharges often, or will not reseat is a warning, not a nuisance: it may report overheating or excess pressure, or have failed itself.

Do not cap the discharge pipe, plug the valve, or tie the lever down. That valve is the last protection against dangerous pressure build up. Shut the unit down, turn off its water supply, and call it in as urgent. Tell the plumber whether the discharge is a trickle or a stream.

Rumbling, banging, and sediment

A tank that rumbles, pops, or bangs as it heats usually has sediment on the bottom, the noise being steam and water moving through that layer. Alone, this is not a midnight emergency. It is a prompt service call: sediment shortens the heater's life and can precede failure. Book sooner if noise comes with leaking or discoloured hot water, and mention it when booking, so flushing is part of the visit.

Frozen pipes

Signs: a tap giving nothing or only a trickle, frost on an exposed pipe, a bulge in a pipe run, cold walls or cabinets where pipes pass. Check more than one tap. Several fixtures affected points to a shared section. No water entering the house at all points to the meter or supply line: call your utility.

Be ready at the shutoff before you thaw. A frozen pipe may already have split, and the split shows only when the ice melts and pressure returns.

Thaw gently, with warm air. Open the affected tap slightly, so melt water and steam can escape and you can see flow return. Warm the pipe with a hair dryer moved steadily along it, warm towels wrapped around it, or a portable heater at a safe distance, watched while it runs.

Never use an open flame: no blowtorch, no flame near insulation, framing, or stored materials. It is a fire risk and can damage the pipe. Never leave a heater unattended in a closed cabinet or crawl space. Do not leave a frozen house unheated while you wait or travel: keep heating on steadily, and let a vulnerable tap drip in a hard freeze if your plumber or utility advises it locally.

Expect trouble at the thaw. Watch each section as flow returns, and check rooms below and behind it for drips and stains. If a pipe has burst, close the main shutoff, drain the lines from a low tap, and call it in as the burst pipe emergency it now is.

Documenting for insurance

Photograph the damage before you clean, and keep photographing as you work. Take wide shots of the room and water source, then close shots of damaged flooring, walls, and belongings. Photograph the failed part: the split pipe, the burst hose, the heater label and its base.

Keep the failed parts. Ask the plumber to leave the removed hose, valve, or pipe section with you, labelled with the date. Keep every receipt: callout, parts, mitigation, drying equipment, essentials. Note times while they are fresh: discovery, water shut off, your call, the plumber's arrival, the water stopped.

Do not throw damaged belongings away before photographing them and checking what your policy requires, and do not start permanent repairs until you know what your insurer wants inspected. Do start mitigation: stopping water, removing standing water, and drying are expected of you.

Calling with the details ready

A dispatcher needs four things: what happened, whether the water is shut off, the address, and a callback number. Have those ready before you dial, then add the details that save a second trip.

Say what happened and where: a pipe under the kitchen sink, a heater leaking at its base, sewage in the downstairs shower. Say whether the water is shut off, partly off, or still running, and where your shutoff is. Give the full address and a callback number for the phone you will actually answer. Add access details: a gate code, dogs to put in a room, a tenant who must let the plumber in, parking limits, an alarm.

Confirm the fees before dispatch. Ask the after hours fee, what the diagnostic fee covers, whether it is credited toward the repair, and how the repair is priced once the cause is found. Ask which payment methods are accepted on site.

Listings on this site marked Open 24 hours in their hours summary publish that availability in their source record; confirm it on the call. If the first company cannot attend in reasonable time and water is still running, call the next one.

What the plumber does on arrival

Expect the plumber to confirm the water is off, inspect the source before touching anything, and protect the working area where the job allows.

Then expect a diagnosis and a price before repair begins, except where immediate action is needed to stop damage. The plumber should state what failed, what the repair involves, what it costs, what is included, and what would cost more if it proves necessary. That is your moment to approve or decline with eyes open. Approve the repair, approve only tonight's safety work with the rest quoted for business hours, or decline and pay the agreed diagnostic fee. Do not accept work proceeding into new cost without your agreement, or a verbal total for a job large enough to put in writing.

Ask while the expert is in the room. Repair or replacement, and how long should it last? What caused it: age, pressure, freezing, corrosion? Is anything else on this run of pipe in the same condition? Keep the paperwork with your house records. Before the plumber leaves, confirm the water is back on, check the repaired area together, and agree what to watch for tomorrow.

After the water stops: drying and prevention

Dry promptly. Water sitting in flooring, wall cavities, and cabinet bases does further damage after the leak is fixed, and damp materials deteriorate and smell. Remove standing water, run fans across wet surfaces, and use a dehumidifier in the closed room if you have one. For a large loss, ask your insurer and plumber about professional drying. The damage bill runs until the building is dry.

Then work this prevention checklist, in the weeks after, not the same night. Every adult knows the main shutoff and meter locations, how each valve type turns, and has operated the main valve once to prove it moves. Label the valves: main, water heater supply, washing machine, bathroom isolation valves. Replace any valve that will not close fully.

Replace ageing braided supply hoses before they fail. Hoses feeding washing machines, dishwashers, toilets, and taps are a common source of sudden, heavy leaks. A hose bulging, rusted at its fittings, stiff, or of an age nobody can remember should be replaced as planned work, with the date noted.

Consider leak sensors under the water heater, behind the washing machine, under sinks, and near any fixture that has leaked before. One that alarms or alerts your phone catches leaks in minutes, not hours.

Prepare for freezes before cold snaps, not during them: insulate exposed pipes in crawl spaces, garages, and exterior walls, seal drafts where pipes enter, disconnect garden hoses, and drain exterior taps where your system provides for it. Service the water heater on a planned cycle: ask what your model needs, including flushing sediment and checking the relief valve, and keep the unit's age in your records, so replacement is planned, not a flooded emergency.

Getting matched, free

When the water is stopped and you are ready to choose who comes out, or when the problem can wait and you want to choose carefully rather than quickly, you can Get Matched free through this directory. State the job and the urgency honestly, as above, and the response and price basis will match the real situation.

Before agreeing to work, read How to Choose a Plumber for the checklist that applies even in an emergency: license checked at the source, insurance by its dates, a written estimate before major work. For what the job should cost, in ranges you can compare against any quote, see the Plumber Cost Guide.