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Winter in Australia might not bring the extreme freezing temperatures of Europe or North America, but it absolutely hammers plumbing systems. Burst pipes, failed hot water systems, blocked drains from increased indoor water use, and hidden leaks that go unnoticed for weeks are all common winter plumbing issues.

The regions most affected are the southern states — Victoria, Tasmania, the ACT, and the tablelands and ranges of NSW and Queensland — where overnight temperatures regularly drop below 5 degrees and can hit zero or below. But even in milder climates, winter puts extra strain on plumbing that deserves attention.

This checklist covers everything you need to protect your home's plumbing this winter.

Frozen and Burst Pipes

While less common in Australia than in colder countries, frozen pipes do occur — particularly in alpine regions, the Canberra region, the Victorian highlands, and the New England region of NSW. Even in suburban Melbourne, outdoor pipes and those in uninsulated subfloors can freeze during cold snaps.

How Pipes Freeze and Burst

When water inside a pipe freezes, it expands. This expansion creates enormous pressure — enough to split copper pipes, crack PVC, and burst joints. The burst often does not happen at the frozen point; it happens downstream where the pressure builds.

The most vulnerable pipes are those that are exposed outdoors (garden taps, irrigation lines), in unheated areas like subfloors and garages, in uninsulated external walls, and in ceiling cavities with poor insulation.

Prevention Steps

What to Do If a Pipe Freezes

If you turn on a tap and nothing comes out during a cold snap, a pipe may be frozen. Here is what to do:

1. Turn off the water at the mains. This limits damage if the pipe has already burst and is waiting to thaw.
2. Open the affected tap. This relieves pressure and allows water to flow once the pipe thaws.
3. Gently warm the pipe. Use a hairdryer, hot water bottles, or towels soaked in warm water. Never use an open flame or heat gun — this can damage pipes and fittings.
4. Call a plumber if the pipe does not thaw within an hour or if you find a burst. A burst pipe behind a wall or under a floor can cause extensive hidden damage.

The Cost of a Burst Pipe

Hot Water System Maintenance

Your hot water system works hardest in winter — longer showers, more hot water used for dishes and laundry — and that is exactly when failures happen most often. The average Australian hot water system lasts 8–12 years, and winter is when aging systems are most likely to fail.

Signs Your Hot Water System Is Struggling

Winter Hot Water Maintenance Tasks

Blocked Drains

Winter is peak season for blocked drains. Leaves and debris clog stormwater drains, reduced evaporation means wetter ground and more surface water, and indoor water usage increases, putting more pressure on sewer drains.

Prevention Steps

Tree roots are the number one cause of sewer blockages in Australia. They are attracted to the moisture and nutrients in sewer pipes and can grow through tiny cracks in older clay or earthenware pipes. Winter rain softens the ground and accelerates root growth into pipe joints.

If you have large trees within 5 metres of your sewer line, consider an annual CCTV drain inspection to catch root intrusion early — before it causes a sewage backup into your home.

Outdoor Plumbing

Outdoor plumbing is the most exposed to winter weather and the most commonly neglected.

Your Winter Plumbing Checklist

Work through this checklist at the start of winter (May–June in Australia) to protect your home through the colder months.

Immediate (Do This Week)

• Insulate exposed pipes with foam lagging (outdoor, subfloor, ceiling)
• Disconnect and store garden hoses
• Shut off and drain irrigation systems
• Clear all external drain grates
• Check hot water system for leaks, rust, or unusual noises

Before Winter Sets In

• Book a hot water system service (flush, anode check)
• Check under sinks for drips or slow leaks
• Test all indoor taps — note any that are slow or have low pressure
• Install drain guards on external drains
• Clean gutters and downpipes

Ongoing Through Winter

• Clean hair traps in bathroom drains weekly
• Avoid pouring fats or oils down kitchen drains
• On frost nights: drip outdoor taps slightly or cover with tap covers
• Monitor hot water temperature — report drops to a plumber
• Check for damp spots on walls, ceilings, and floors (signs of hidden leaks)

When to Call an Emergency Plumber

Some situations cannot wait for a scheduled appointment.

Emergency plumber callout fees in winter typically range from $150–$350, with hourly rates of $130–$250 for after-hours work. Despite the cost, delaying an emergency call almost always results in greater damage and a larger total bill.

Key Numbers to Keep Handy

Keep these numbers saved in your phone before you need them:

• Your regular plumber (ask friends for a recommendation before winter)
• Mains water shut-off location (know where it is and how to turn it off)
• Gas emergency line (your gas provider's 24/7 number)
• Home insurance claims line (for water damage claims)
• State Emergency Service (SES): 132 500 (for storm and flood assistance)

Winter plumbing problems are largely preventable. A few hours of preparation and a modest investment in pipe lagging, drain guards, and a hot water service can save you thousands in emergency repairs and water damage. Protect your home before winter hits, not after.