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Commercial Leak Prevention Guide

For building managers, strata managers, and facilities teams managing water systems at scale.

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A residential home has one water service line, maybe a few underground pipes, straightforward plumbing. A commercial building has kilometres of pipe, multiple entry points, dozens of fixtures, shared systems, often decades old.

Scale amplifies losses. A 0.5-litre-per-hour leak in one home is $500/year. Same leak across 100 units might go unnoticed for months, costing thousands. Ageing infrastructure adds risk. Copper from the 1970s, cast iron drains, concrete encasing unknown pipes. When something fails, it is often hidden and expensive to find.

Multiple users mean multiple failure points. Quiet toilet in private apartment, dripping balcony fitting, equipment seal weeping in basement: any can go unnoticed in a busy building.

Non-revenue water is water entering your building but lost to leaks before being billed to occupants. It is wasted, and you're paying for it.

Typical commercial building: 10-20% non-revenue loss. Some older buildings: 30%+ loss. That is tens of thousands of dollars per year.

Measure it by subtracting water billed to tenants or used for legitimate purposes from total water metered into the building. Example: a 50-unit apartment building receives 500,000 litres monthly. Tenants are billed for 420,000 litres. The missing 80,000 litres may be leaking from commons, fire systems, or underground mains.

Reactive maintenance means waiting for something to break. An unknown leak runs for months, water damage appears in a tenant unit, emergency repairs are needed, and tenant claims, loss of occupancy, and body corporate liability can follow.

Planned maintenance means an annual audit finds and repairs a small leak before damage. Ongoing monitoring keeps it controlled. Over five years, planned maintenance can save tens of thousands and prevent resident complaints, damage, and liability.

  • Quarterly metre audits: read water metres at the same time each quarter and compare to tenant billing or usage.
  • Annual pressure testing: isolate and pressure test major supply lines and common area plumbing.
  • Annual visual inspection: walk commons, basements, and mechanical rooms for damp, staining, corrosion, pooling, and equipment-pad moisture.
  • Every 3-5 years: complete a full building leak detection audit using acoustic, thermal, and pressure-testing methods.

Councils and insurers expect documented maintenance. If a leak causes damage, documented maintenance history protects your claim. Body corporate owners also need to see that money is spent responsibly on maintenance.

Keep a log of monthly or quarterly water metre readings and trends, annual pressure testing results, repairs made, leak detection reports, and visual inspection notes or photos.

Have building age, size, occupancy, water bills or metre readings from the past 12 months, water system layout, known problem areas, and past maintenance records ready.

Expect a comprehensive site audit, pressure testing, acoustic detection, thermal imaging, a detailed report identifying leaks and repair recommendations, and ongoing monitoring or maintenance recommendations.

Annual prevention budgets commonly include quarterly audits, annual pressure testing, annual visual inspection, and a full audit every 3-5 years.

A typical annual investment of $2,000-$4,000 for ongoing prevention can be repaid many times over by preventing one significant leak.

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