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Southside – 3397 2030
Northside – 3868 3585

Key Takeaways

Every homeowner encounters plumbing issues from time to time. While some problems are easy DIY fixes, others require the trained hands of a licensed plumber. Understanding the most common household plumbing problems—and knowing when to call a pro—can save you both time and money. Here’s your essential guide to the top 10 plumbing problems and how to fix them or decide if it’s time to get help. 

Household Plumbing Problems Infographic

1. Leaking Taps

Leaking taps are one of the most common plumbing issues homeowners face. While they may seem harmless, a small drip can waste thousands of litres of water each year, increase utility bills, and indicate underlying plumbing wear. Addressing leaking taps early prevents bigger problems like corrosion, water damage, and increased pressure on your plumbing system.

The Problem:

A leaking tap occurs when internal components wear out, loosen, or become damaged. Common causes include:

Left untreated, leaks can stain sinks, damage surfaces, and waste considerable water.

DIY Fix:

Many leaking taps can be repaired with basic tools. Useful steps include:

Additional DIY tips:

Call a Pro If:

Some leaking taps point to larger or hidden issues that require professional expertise. You should call a plumber if:

A licensed plumber can diagnose deeper issues, replace entire assemblies, or check for pressure irregularities that may damage your plumbing system.

2. Slow or Clogged Drains

Slow or clogged drains are more than an inconvenience—they’re often early warnings of larger plumbing problems. Ignoring them can lead to foul smells, pipe damage, and even sewage backups. Understanding what causes these blockages helps you determine whether a quick DIY fix is enough or if a professional inspection is required.

The Problem:

Clogged drains happen when debris accumulates inside pipes, restricting water flow. Common culprits include:

Slow drainage can quickly escalate into full blockages, causing water to back up into sinks, showers, or toilets.

DIY Fix:

Many simple blockages can be cleared with safe, at-home methods:

Avoid:

Call a Pro If:

Certain drain issues require licensed plumbing equipment and expertise. Contact a professional plumber if:

Professional plumbers use advanced tools such as:

These methods ensure the problem is diagnosed accurately and fixed safely.

3. Running or Constantly Flushing Toilet

A running toilet may seem like a minor inconvenience—a faint trickle of water or a soft hiss at the cistern—but it’s actually one of the most wasteful plumbing problems in the home. A continuously running toilet can waste hundreds to thousands of litres of water each day, dramatically increasing your water bill and putting unnecessary strain on your plumbing system. Over time, the constant flow can indicate worn parts, incorrect adjustments, mineral buildup, or deeper issues within the toilet’s internal mechanism. Because toilets rely on a delicate balance of floats, valves, seals, and levers, even the smallest malfunction can prevent the system from shutting off properly.

The Problem:

A continuously running toilet means the cistern is unable to shut off the water supply. Water flows from the tank into the bowl non-stop, or the cistern continually refills itself because the internal components cannot create a proper seal.

Common causes include:

1. Faulty flapper valve

The flapper lifts during flushing to allow water to exit the tank. Over time, the rubber becomes warped, brittle, or coated in mineral deposits, preventing a tight seal. This allows water to flow constantly into the bowl.

2. Float problems

The float regulates the water level. If it sits too high, the cistern overfills. Excess water drains through the overflow tube, causing continuous refilling. A damaged or waterlogged float may not rise properly, failing to signal the fill valve to shut off.

3. Worn fill valve (inlet valve)

The fill valve controls water entering the cistern after flushing. When it wears down or sticks, it may fail to close—resulting in an endless refill cycle or loud humming noises.

4. Loose, misaligned, or disconnected parts

Chains, levers, and rods inside the cistern can loosen over time. If the flapper chain is too tight, too loose, or tangled, the toilet won’t seal properly.

5. Mineral or limescale buildup

Hard water can coat internal parts in scale, preventing valves from sealing or moving correctly. This buildup can also cause noisy filling, slow flushing, or partial refills.

6. Cracked overflow tube

A damaged overflow tube lets water continuously drain from the tank, forcing the fill valve to keep topping it up.

7. Incorrect installation or wear in dual-flush mechanisms

Dual-flush buttons and rods can become misaligned or break internally, causing partial flushing or continuous water flow.

If ignored, a running toilet can lead to structural damage, mould growth, or a severe increase in water bills.

DIY Fix:

1. Check and replace the flapper valve

If it’s discoloured, hardened, or no longer flexible, replace it. Flappers are inexpensive and simple to install.

2. Adjust the float height

Ensure the float sits at the correct level—usually marked inside the cistern. Lowering the float stops overfilling and prevents constant water flow into the overflow tube.

3. Clean internal parts

Remove sediment or limescale by soaking components in vinegar. This helps restore proper sealing and movement.

4. Replace the fill valve or flush mechanism

Modern fill valves are inexpensive and designed for easy DIY installation. A new valve solves issues like noisy filling, vibrating pipes, and continuous refilling.

5. Check and adjust the chain

If the chain is too short, it keeps the flapper partially open. Too long, and it may get stuck under the flapper. Adjust the length so the flapper closes cleanly.

6. Tighten loose bolts and align parts

Ensure all internal components move freely and are positioned correctly.

Call a Pro If:

A professional plumber can fully disassemble the toilet cistern, inspect inner workings, replace faulty parts, diagnose deeper issues, or recommend a full upgrade for better efficiency.

4. Low Water Pressure

Low water pressure can affect everything from shower performance to how quickly you can wash dishes or fill a bathtub. Many homeowners initially ignore low pressure, believing it’s only an inconvenience. However, pressure problems often signal hidden leaks, blocked pipes, hot water system failures, or supply issues that require prompt attention. Poor pressure not only impacts your comfort—it can shorten the lifespan of appliances, cause inconsistent water temperature, and increase household water usage.

The Problem:

Low pressure means that water isn’t flowing through your pipes at normal strength. This may happen suddenly or develop slowly over time.

Common causes include:

1. Pipe corrosion

Older galvanised steel pipes corrode from the inside out. Rust and scale buildup narrows the internal pipe diameter, restricting water flow and causing dirty or discoloured water.

2. Mineral and limescale buildup

In areas with hard water, minerals accumulate inside showerheads, tap aerators, and even water heaters. This buildup reduces flow and can harden like cement.

3. Partially closed or faulty shut-off valves

If someone recently performed maintenance, a valve may not have been reopened fully. Even slightly closed valves drastically reduce pressure.

4. Hidden leaks in the plumbing system

Undetected leaks behind walls, under flooring, or underground waste water. Lost pressure often leads to damp walls, mould smells, or sudden spikes in water bills.

5. Hot water system issues

Sediment buildup inside hot water tanks reduces water flow. Faulty pressure relief valves, heating elements, and blocked filters also affect pressure.

6. Blocked filters or aerators

Small screens inside taps and appliances catch debris. Over time, they clog, restricting flow.

7. Supply line or council issues

Sometimes the problem lies outside your home—main breaks, repairs, or neighbourhood supply limitations can temporarily affect pressure.

8. Pressure regulator failure

Some homes have pressure-reducing valves. If these malfunction, they can severely reduce or dangerously increase pressure.

Left unchecked, low pressure can cause pipe strain, temperature fluctuations, noisy plumbing, and appliance inefficiency.

DIY Fix:

1. Clean or replace showerheads and aerators

Unscrew the fittings and soak them in vinegar overnight to dissolve hard mineral deposits. Replace outdated fixtures with high-flow or water-efficient models.

2. Check all shut-off valves

Inspect valves under sinks, behind toilets, and at the meter box. Ensure they are fully open and not partially closed by accident.

3. Inspect for visible leaks

Check under sinks, around toilets, behind appliances, and along outdoor pipes. Leaks often appear as:

4. Replace old or blocked appliance hoses

Washing machines and dishwashers often collect sediment in intake hoses. Replace or clean mesh filters to restore flow.

5. Flush your hot water system

Sediment reduces hot water pressure. Draining and flushing the tank removes buildup and improves both temperature and flow.

5. Clean filters on taps and appliances

Remove small mesh screens and rinse out sediment.

Call a Pro If:

Professional plumbers use advanced tools such as pressure gauges, thermal cameras, acoustic leak detectors, and camera inspections to identify and fix the problem safely.

5. Blocked Toilet

A blocked toilet is one of the most urgent and unpleasant plumbing issues homeowners encounter. Whether the bowl fills up without flushing or the water rises dangerously close to overflowing, this problem needs fast attention. Blocked toilets are usually caused by foreign objects, excessive toilet paper, or deeper plumbing issues. Addressing the blockage quickly prevents sewage backups, water damage, and bad odours.

The Problem:

Toilets can clog due to a variety of reasons, from simple paper blockages to major sewer line problems.

Common causes include:

A blocked toilet can quickly escalate into a hygiene and property damage issue if not handled immediately.

DIY Fix:

1. Use a flange plunger

A flange or toilet plunger forms a tight seal inside the bowl’s drain opening. Strong, deliberate plunging can break apart most simple blockages.

2. Try a toilet auger (plumbing snake)

This flexible tool can reach deeper into the toilet trap to hook or break apart stubborn obstructions like wipes, toys, or compacted paper.

3. Add hot (not boiling) water

Pouring hot water into the bowl can help dissolve soft blockages or loosen toilet paper clumps.

4. Use a natural dissolving solution

Add baking soda followed by vinegar to help break down organic blockages and reduce odours.

5. Check water level in the tank

Low tank water can reduce flushing power—adjusting the float may help.

Important: Never use chemical drain cleaners in a toilet. They can damage porcelain, melt seals, and cause serious pipe corrosion.

Call a Pro If:

A plumber will use CCTV cameras, high-pressure jetting, or root-cutting equipment to diagnose and clear the blockage safely.

DIY or Call a Plumber Infographic

6. No Hot Water

Few issues are as frustrating as turning on the tap and being greeted with icy cold water. Hot water problems can stem from electrical issues, gas supply interruptions, thermostat failures, or end-of-life hot water systems. Because hot water systems involve electricity, gas, and pressurised tanks, diagnosing the issue correctly is crucial.

The Problem:

“No hot water” typically means your hot water system isn’t heating, isn’t receiving power, or has reached the end of its lifespan.

Common causes include:

A total lack of hot water is often a sign your system needs repair—or full replacement.

DIY Fix:

1. Check your power or gas supply

Ensure the switchboard hasn’t tripped and your gas valves are open. If using LPG, check your bottle isn’t empty.

2. Reset the hot water system

Many modern systems have a reset button. Press and hold to restart the heating cycle.

3. Reignite the pilot light

For gas units, follow the manufacturer’s instructions to safely relight the pilot flame.

4. Flush sediment from the tank

Draining several litres from the tank can sometimes restore heating efficiency.

5. Inspect for visible leaks

Water pooling around the base of the unit indicates internal tank failure—this requires immediate attention.

Call a Pro If:

A licensed plumber or hot water technician can repair faulty components, replace the thermostat, install a new tempering valve, or recommend a suitable replacement system.

7. Burst or Leaking Pipes

Burst or leaking pipes are among the most serious plumbing emergencies. They can cause extensive water damage to floors, walls, and ceilings—leading to mould growth, electrical hazards, and costly home repairs. These issues require immediate action to prevent structural damage and flooding.

The Problem:

Leaks and burst pipes happen when pressure builds inside the plumbing system or when pipes deteriorate.

Common causes include:

Signs of a hidden leak include damp patches, musty smells, peeling paint, or warm spots on the floor (if hot water lines are leaking).

DIY Fix (Emergency Steps):

1. Shut off the main water supply immediately

This prevents flooding and further damage. Locate the valve outside near the meter or along the home’s perimeter.

2. Turn on taps to relieve pressure

Opening cold taps helps drain remaining water inside the pipes.

3. Catch leaking water

Use buckets or towels to minimise property damage.

4. Protect electrical appliances

Move electronics away from water-affected zones to prevent electrical hazards.

5. Take photos

Document damage for insurance purposes.

Note: Actual pipe repair should not be attempted by DIY homeowners. Temporary tape or clamps only slow the leak—they do not fix the root problem.

Call a Pro Immediately:

Burst or leaking pipes are plumbing emergencies. Hire a licensed plumber immediately if:

A professional plumber will locate the leak using electronic detection tools, replace damaged pipes, repair joints, and ensure your system is safe and secure.

8. Water Heater Leaks

A leaking water heater is more than a nuisance—it’s a serious warning sign. Even small drips can quickly escalate into major water damage, mould growth, and complete system failure. Because water heaters contain high-pressure and high-temperature water, leaks should be addressed promptly to avoid safety risks.

The Problem:

A water heater leak can come from several areas of the system:

Common causes include:

If left unaddressed, the entire tank may rupture—causing flooding and emergency-level water damage.

DIY Fix:

1. Check for loose connections

Sometimes tightening the cold or hot water inlet connections resolves minor drips.

2. Inspect the drain valve

Make sure it’s fully closed. Loose drain valves can mimic tank leaks.

3. Lower the thermostat temperature

Overheating can cause excess pressure and spills from the TPR valve.

4. Flush the tank

Sediment buildup can cause overheating and cracking. Draining the tank removes sediment and may stop minor leaks.

5. Place a container under the leak

For short-term prevention while waiting for a plumber.

Call a Pro If:

A plumber can diagnose whether the tank can be repaired or if a full replacement is required. In many cases, older leaking tanks are beyond repair.

9. Sewer Line Backups

Sewer line backups are one of the most serious plumbing issues a homeowner can face. When wastewater can’t flow out of your home, it has nowhere to go but back inside—often through toilets, showers, or floor drains. This poses major health risks and requires immediate professional attention.

The Problem:

Sewer backups occur when there is a blockage or collapse somewhere in the main sewer line.

Common causes include:

Signs of a sewer backup include:

DIY Fix:

Because sewer line issues involve contaminated wastewater and deep underground pipes, DIY options are extremely limited. However:

1. Turn off all water appliances

Stop using sinks, toilets, showers, and laundry to prevent further backup.

2. Try plunging affected fixtures

This may relieve very minor blockages, but often sewer issues are too deep.

3. Remove standing water (safely)

Use gloves and disinfectant if water has backed into the home.

4. Check outdoor sewer cleanout

If you have an external cleanout cap, unscrewing it may release pressure and restore temporary flow.

Important: Sewer issues are not DIY jobs.
They require specialised equipment and health safety practices.

Call a Pro Immediately:

Plumbers use CCTV drain cameras, high-pressure water jetting, and root-cutting machines to accurately diagnose and resolve sewer line issues.

10. Gas Leaks

Gas leaks are a serious emergency that pose life-threatening risks, including fires, explosions, and carbon monoxide poisoning. Even a small gas leak should be handled immediately by a licensed gas fitter. Understanding the signs of a gas leak and acting quickly is crucial for your safety.

The Problem:

Signs of a gas leak include:

Gas leaks can occur due to:

Even a minor leak can accumulate gas inside your home—turning any spark into a dangerous ignition.

DIY Fix (EMERGENCY ACTION ONLY):

1. Turn off the gas supply immediately

Shut the valve at the gas meter (usually a quarter-turn valve).

2. Open doors and windows

Allow gas to disperse quickly.

3. Evacuate everyone from the home

Ensure pets are removed too.

Do NOT:

Call emergency services or a licensed gas plumber from a safe location.

There are no DIY gas repairs. Only licensed gas fitters may legally repair or modify gas lines.

Call a Pro Immediately :

Call an emergency plumber or gas fitter if:

Professionals use gas detectors, pressure tests, and leak tracing tools to find and fix leaks safely.

Conclusion

Plumbing problems are an inevitable part of homeownership, but knowing how to identify them early—and when to call a professional—can save you time, money, and stress. From leaking taps and slow drains to serious issues like burst pipes and sewer backups, each problem has its own warning signs and risks. Addressing minor concerns promptly can prevent them from growing into costly repairs or damaging your home’s structure.

While some issues are manageable DIY tasks, many require the expertise, tools, and safety knowledge of a licensed plumber. A qualified professional can diagnose hidden problems, make lasting repairs, and keep your home’s plumbing system running smoothly and reliably. When in doubt, it’s always safer to seek expert help and protect your home from avoidable damage.

Need a Fast, Reliable Plumber? Call Alliance Plumbing Today

Plumbing problems can quickly escalate—don’t wait until a minor issue turns into costly damage. Whether you’re dealing with blocked drains, running toilets, leaking pipes, or hot water failures, Alliance Plumbing offers fast, dependable, and affordable service across your area.

Why Choose Alliance Plumbing?

Get your plumbing fixed today with trusted local experts.

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Southside – 3397 2030
Northside – 3868 3585
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