Commercial water tanks are often hidden away in plant rooms, basements and rooftop service areas — out of sight and, unfortunately, out of mind.

However, ageing water storage systems can quickly become a serious issue for commercial buildings if warning signs are ignored. From leaks and corrosion to compliance failures and contamination risks, a failing tank can lead to expensive disruption, emergency repairs and potential downtime.

At Express Water Tanks, we support facilities managers, estates teams and building owners across the UK with professional commercial water tank repair and replacement services.

Here are five signs your commercial water tank may be heading towards failure.

1. Persistent Leaks Around the Tank or Pipework

One of the clearest warning signs is recurring leaks around sectional joints, valves, access hatches or connected pipework.

While small leaks may appear manageable at first, they are often a sign of wider deterioration within the system. Over time, leaking joints can weaken structural integrity and increase the risk of sudden failure.

Common Causes of Water Tank Leaks

  • Ageing seals and gaskets
  • Corroded pipe connections
  • Movement within sectional panels
  • Damaged or poorly fitted access hatches

Our commercial water tank repair services include resealing, panel replacement and pipework upgrades to prevent further deterioration.

2. Corrosion, Cracks or Structural Damage

Physical deterioration is another major warning sign. Older metal tanks may show visible corrosion, while GRP tanks can develop cracks, stress fractures or damaged sectional joints.

Even where damage appears minor, structural issues can worsen rapidly — particularly in older buildings or rooftop environments exposed to fluctuating temperatures.

Signs of Structural Deterioration

  • Rust or staining around joints
  • Bulging or distorted panels
  • Visible cracks or surface damage
  • Deteriorating support structures

In some cases, targeted repair work may be suitable. In others, full commercial water tank replacement may be the safest long-term solution.

3. Poor Water Quality or Contamination Concerns

If your building experiences unusual water discolouration, odours or hygiene concerns, the storage tank should be professionally inspected immediately.

Damaged lids, poorly sealed access hatches and inadequate screening can allow contaminants into the system, creating serious compliance and health risks.

The Importance of Water Hygiene Compliance

Commercial water systems must comply with current water hygiene regulations, including ACoP L8 guidance relating to Legionella control.

Express Water Tanks provides:

  • Tank inspections
  • Water tank chlorination
  • Cleaning and disinfection
  • Compliance upgrades

4. Your Tank Is More Than 20–30 Years Old

Many commercial buildings across the UK still rely on water tanks installed decades ago. While some systems remain operational, age alone can significantly increase the likelihood of failure.

Older tanks may no longer meet modern compliance standards, insulation requirements or building demand.

Older Buildings Often Require Specialist Attention

We regularly work in:

  • Hospitals and healthcare facilities
  • Hotels and hospitality venues
  • Office blocks and high-rise buildings
  • Government and council properties
  • Historic and listed buildings

Older plant rooms often present restricted access and ageing infrastructure, requiring careful planning and specialist experience.

5. Emergency Repairs Are Becoming More Frequent

If your building repeatedly requires emergency callouts or temporary fixes, it may indicate that the system is reaching the end of its lifespan.

Repeated repair costs can quickly exceed the cost of planned refurbishment or replacement — especially when disruption to tenants or operations is considered.

Planned Replacement Reduces Long-Term Risk

Replacing an ageing system before failure occurs helps to:

  • Reduce emergency downtime
  • Improve compliance
  • Protect water quality
  • Improve reliability
  • Reduce long-term maintenance costs

Commercial Water Tank Specialists Across the UK

At Express Water Tanks, we provide nationwide commercial water tank repair and replacement services, supporting buildings across:

Whether you require emergency repair, planned replacement or a professional inspection, our team is here to help.

Arrange a Commercial Water Tank Assessment

If your commercial water tank is showing signs of deterioration, now is the time to act before small issues become major failures.

Contact Express Water Tanks today to arrange a professional assessment.