Why Water Testing Matters

Water testing is essential for protecting health, ensuring safety, and meeting legal obligations. Whether you're a landlord, business owner, or facility manager, regular water testing helps identify contamination risks before they become serious health hazards.

Protecting Health and Safety

Contaminated water can harbour dangerous bacteria like Legionella (which causes Legionnaires' disease) and other harmful microorganisms. Regular testing ensures your water systems are safe for drinking, washing, and other uses.

Key health risks from untested water:

  • Legionnaires' disease - a severe form of pneumonia
  • Bacterial infections 
  • Exposure to waterborne pathogens
  • Vulnerable populations at greater risk (elderly, immunocompromised)

Testing provides peace of mind that your water is safe and helps you take action if contamination is detected.

Legal and Regulatory Compliance

In the UK, water testing isn't just good practice - it's often a legal requirement. The Health and Safety at Work Act 1974 and the Control of Substances Hazardous to Health (COSHH) Regulations 2002 require duty holders to assess and control risks from Legionella bacteria.

Who has legal obligations?

  • Landlords - must assess and manage Legionella risks in rental properties
  • Employers - responsible for workplace water safety for all staff and visitors
  • Building managers - must maintain safe water systems in commercial premises
  • Care home operators - protecting vulnerable residents and staff
  • Hotel and leisure facilities - ensuring guest and staff safety

The HSE's L8 Approved Code of Practice provides detailed guidance on controlling Legionella risks. Regular testing supports your compliance programme and contributes to your risk management efforts.

- Read Legionella testing for landlords

Understanding Legionella Testing

Legionella bacteria thrive in water systems between 20-45°C, particularly in stagnant water, dead-legs, and poorly maintained systems. Testing identifies whether Legionella is present and at what levels.

When Legionella testing is essential:

  • Hot and cold water systems in buildings
  • Cooling towers and evaporative condensers
  • Spa pools and hot tubs
  • Water features and fountains
  • Any system that creates water aerosols

Testing frequency depends on your risk assessment:

  • High-risk systems: quarterly testing
  • Medium-risk systems: annual testing
  • After system changes or maintenance
  • Following periods of low use or stagnation

Testing should form part of a wider water safety or control programme. Duty holders remain responsible for managing risks within their premises.

- Learn more about what Legionella is
- View Legionella water testing kits

Understanding TVC (Total Viable Count) Testing

TVC testing measures the total number of viable bacteria in your water sample. It's a general indicator of water quality and system cleanliness, helping identify potential contamination before specific pathogens become a problem.

Why TVC testing matters:

  • Indicates overall water quality and system hygiene
  • Early warning sign of potential contamination
  • Monitors effectiveness of water treatment
  • Helps identify system maintenance needs
  • Often required alongside Legionella testing

TVC testing is particularly important for:

  • Potable Cold Water Storage Tanks 
  • Drinking water systems fed from a Cold Water Storage Tank
  • Healthcare facilities
  • Food preparation areas
  • Manufacturing processes using water
  • Any system where water quality is critical

High TVC levels don't necessarily mean Legionella is present, but they indicate conditions that could support bacterial growth and suggest your water system needs attention.

- Learn more about TVC water testing

The Cost of Not Testing

Failing to test your water can have serious consequences:

Health consequences:

  • Outbreaks of Legionnaires' disease
  • Serious illness or death
  • Long-term health impacts for survivors

Legal consequences:

  • Prosecution under health and safety legislation
  • Unlimited fines for serious breaches
  • Potential imprisonment for gross negligence
  • Civil claims from affected individuals

Business consequences:

  • Reputational damage
  • Loss of business and customers
  • Increased insurance premiums
  • Closure orders from authorities

Regular testing is a small investment compared to the potential costs of an outbreak or legal action.

How Often Should You Test?

Testing frequency depends on your risk assessment and the type of system:

Legionella testing:

  • High-risk systems (cooling towers, healthcare): quarterly
  • Medium-risk systems (hotels, offices): annually
  • Low-risk systems (small domestic): every 2 years or after changes
  • After periods of low use or stagnation
  • Following maintenance or system modifications

TVC testing:

  • Every 6 Months for Cold Water Storage Tanks feeding drinking water outlets  
  • Often conducted alongside Legionella testing
  • More frequent testing for drinking water systems
  • After water treatment or system cleaning
  • When water quality concerns arise

Your risk assessment should determine the appropriate testing schedule for your specific circumstances.

Getting Started with Water Testing

Water testing doesn't have to be complicated. Our UKAS-certified laboratory testing makes it simple:

  1. Order your test kit - choose Legionella, TVC, or both
  2. Collect your samples - follow our simple instructions
  3. Send to our lab - use the prepaid return label
  4. Receive your results - clear, actionable reports within 10-14 days
  5. Take action if needed - we provide guidance on next steps

Our testing kits include:

  • Sterile sample bottles
  • Clear collection instructions
  • Prepaid return postage
  • UKAS-certified laboratory analysis
  • Detailed results report
  • Expert support if you have questions

Ready to Test Your Water?

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