When to Call a Plumber

Most homeowners face a familiar dilemma when something goes wrong with their plumbing: is this something I can handle myself, or do I need to call a professional? The boundary isn't always obvious. A slow drain might respond to a plunger and some drain cleaner — or it could be a sign of a serious blockage deep in your sewer line. Getting that call right can mean the difference between a $15 hardware store fix and a $5,000 emergency repair. This guide covers the ten situations where you should always call a licensed plumber, no exceptions.

The DIY vs. Professional Line

Some plumbing tasks are genuinely DIY-friendly for a confident homeowner: replacing a faucet aerator, swapping out a toilet flapper, using a plunger on a slow drain, or installing a new showerhead. These jobs carry minimal risk, don't require permits, and rarely get worse if you get them slightly wrong on the first try.

But a large category of plumbing problems sits firmly on the professional side of the line — not because the work is necessarily complicated, but because the consequences of getting it wrong are severe. Water damage, sewage contamination, gas leaks, and code violations are expensive and sometimes dangerous. The ten situations below are all in this category.

1. A Burst or Frozen Pipe

A burst pipe is a plumbing emergency. Water can pour out at a rate of hundreds of gallons per hour, causing rapid structural damage, destroying flooring and drywall, and creating the conditions for mold growth within 24 to 48 hours. If you discover a burst pipe, shut off your home's main water supply immediately, then call a licensed plumber. Don't waste time attempting a temporary fix with tape or pipe clamps — they're not reliable on a pressurized line and the underlying cause still needs to be diagnosed and repaired properly.

Frozen pipes in winter are a related concern. If water flow drops suddenly during a cold snap and you suspect a freeze, call a plumber before the pipe thaws on its own — an already-stressed frozen pipe frequently bursts when it warms up.

2. No Water Coming From the Taps

A sudden loss of water pressure or complete loss of flow from multiple taps — after you've confirmed the water utility isn't doing scheduled maintenance — points to a serious problem somewhere in your supply line. Possible causes include a major leak in the main line, a failed pressure regulator, a frozen supply pipe, or (in areas with hard water) a section of pipe that's become almost completely blocked by mineral scale buildup. All of these require professional diagnosis and repair.

3. Sewage Smell or Multiple Drains Backing Up

A persistent sewage smell inside your home — especially one that doesn't go away when you run water in the drains — is a serious warning sign. It can indicate a cracked or failed sewer line, a dry P-trap (easily fixed by running water), or a venting problem that's allowing sewer gases to enter the home. Hydrogen sulfide and methane, both present in sewer gas, are toxic at high concentrations and the latter is flammable.

If multiple drains in your home are backing up simultaneously — for example, flushing the toilet causes water to rise in the bathtub — this is a near-certain sign of a blockage or failure in the main sewer line. A plumber will use a drain camera to diagnose the exact location and nature of the problem. Do not continue to use water-intensive appliances or flush toilets until the issue is resolved.

4. Water Heater Not Working Properly

Water heater issues range from the minor (a pilot light that needs relighting on an older gas unit) to the genuinely dangerous. If you notice any of the following, call a licensed plumber or water heater specialist immediately: no hot water at all, water that smells like rotten eggs (indicating bacterial growth in a unit that's been set too low), rusty or discoloured hot water (internal tank corrosion), a rumbling or popping noise from the tank (sediment buildup, which can cause the heating element to fail), or any visible corrosion, rust, or water around the base of the unit.

Water heaters that develop pressure relief valve problems or that are leaking should be treated as urgent — a failed pressure relief valve on a tank water heater is a serious safety hazard. Never attempt to disable or bypass the pressure relief valve yourself.

5. Visible Water Damage, Staining, or Damp Walls

Brown staining on ceilings, damp patches on walls, soft or buckled flooring, or a musty smell in rooms that shouldn't be damp all point to a water leak somewhere inside the structure of your home. These hidden leaks are particularly destructive because by the time the symptom is visible on the surface, the leak has often been going on for some time — and the actual damage area is usually larger than it appears. A plumber with leak detection equipment can locate the source without unnecessary demolition, then repair the supply or drain pipe causing the problem.

6. Gurgling Noises From Drains or Toilets

When you flush the toilet and hear gurgling from nearby drains — or when water drains from the sink and causes bubbles in the toilet — the plumbing venting system in your home is likely partially blocked. Drain vents allow air into the drain system so water can flow freely; without proper venting, negative pressure builds up and air is sucked through the nearest available opening, causing the gurgling sound. A blocked vent stack is not a DIY repair. A plumber will access the vent stack from the roof to clear the obstruction safely.

7. Slow or Recurring Drain Clogs

A single slow drain that responds to a plunger and some cleaning is a routine homeowner task. But if the same drain clogs repeatedly within weeks of being cleared, or if multiple drains throughout the house are slow at the same time, there's a deeper problem. Recurring clogs are often caused by significant buildup of grease, scale, or debris in the drain line — or, in older homes, by root intrusion into clay sewer pipes. A plumber with a drain auger and camera can clear the obstruction completely and identify whether there's underlying damage that needs addressing.

8. Discoloured or Odd-Tasting Water

Water that runs brown or orange from the cold tap typically indicates rust or corrosion inside aging galvanized steel pipes — a common issue in homes built before 1970. Cloudy or milky-white water can be caused by air in the pipes (usually harmless and temporary) or by a water main repair in your area. Water with a distinct metallic taste, a sulphurous smell, or a blue-green tint (which suggests copper pipe corrosion) should be investigated by a plumber and may warrant professional water quality testing.

Any change in water quality that can't be easily explained should be reported to your water utility and assessed by a licensed professional — especially if the discolouration is consistent rather than a brief flush after work on the mains.

9. Your Water Meter Is Moving With All Taps Off

If you suspect a hidden leak, here's a simple test: turn off every water outlet in the house — taps, appliances, irrigation — and then check your water meter. If the dial or digital display is still moving, water is flowing somewhere it shouldn't be. This indicates a leak in the supply line, possibly underground or inside the walls. Locating and repairing a hidden supply line leak requires specialist leak detection equipment and a licensed plumber. Left unaddressed, even a slow supply line leak can cause foundation damage over time.

10. Any Work That Requires a Permit

In most US jurisdictions, the following plumbing work requires a permit and must be performed by a licensed plumber who can legally pull that permit: new pipe installations, water heater replacements, sewer line work, gas line additions or modifications, bathroom additions, and any work that changes your home's plumbing system rather than simply repairing existing components. Unpermitted work is not only illegal in most areas — it can void your homeowner's insurance coverage and create serious complications when you come to sell the property.

If a contractor offers to skip the permit to save you time or money, walk away. The permit process exists to ensure the work meets safety codes and is inspected by an independent authority. A licensed plumber will always pull the required permits as part of their standard practice.

The Cost of Delaying

The consistent theme across all ten of these situations is that delay makes things worse and more expensive. A hairline crack in a pipe that seeps for months before being noticed can require far more extensive repairs — including structural work — than the same crack caught early. A sewer line that's partially blocked is infinitely cheaper to address than one that has completely failed and backed up into the home. When in doubt, a plumber's diagnostic visit is almost always cheaper than the water damage it might prevent.