Biofilm Awareness Week: Why Biofilm Control Is Critical for Legionella Prevention in Healthcare Facilities

Biofilm Awareness Week is the perfect reminder that one of the most dangerous threats in your water system is also one of the hardest to see. Biofilm is the foundation that allows Legionella, Pseudomonas, and other waterborne pathogens to survive, multiply, and spread inside hospitals and long-term care plumbing systems.

At Legionella Specialties, we help healthcare facilities identify, monitor, and reduce biofilm so they can stay compliant, survey-ready, and patient-safe.

What Is Biofilm and Why Does It Matter?

Biofilm is a sticky layer of microorganisms that clings to the inner surfaces of plumbing and medical equipment. Once it forms, it provides a protected home where bacteria can grow even when disinfectant, hot water, or flushing is present.

Key risk factors that support biofilm and Legionella growth include:

• Warm water temperatures

• Stagnation and water age

• Low disinfectant residual

• Sediment, corrosion, and scale

• Poorly maintained plumbing fixtures

Biofilm shields bacteria from heat and disinfectant, allowing Legionella to survive treatment and recolonize systems quickly. This makes biofilm control essential for any infection prevention and water management strategy.

Why Biofilm Is a Growing Concern in Hospitals and Care Facilities

Healthcare facilities account for a significant share of Legionnaires’ disease cases, and mortality rates can reach 25% in these settings. Biofilm is a primary contributing factor because it becomes a long-term reservoir for dangerous pathogens.

National data shows:

• Legionella is the leading cause of waterborne disease outbreaks in the United States.

• Legionnaires’ disease cases have increased dramatically over the past two decades.

• Biofilm in aging plumbing systems creates optimal conditions for colonization.

For facilities serving immunocompromised or elderly populations, controlling biofilm is not optional it is a core component of risk mitigation and regulatory compliance.

Biofilm Awareness Week and the NBIC

Biofilm Awareness Week is hosted by the National Biofilms Innovation Centre (NBIC), an organization dedicated to advancing research on biofilms in healthcare, the environment, and industry. Their BiofilmAware initiative highlights how biofilms contribute to infections and infrastructure challenges and why awareness is essential.

For infection prevention teams, this week serves as a reminder to evaluate water management practices and verify that biofilm control measures are actually working.

How Biofilm Hides, and Why It’s Hard to Eliminate

Biofilm is difficult to remove because it creates its own protective ecosystem. Inside this matrix, bacteria behave differently than free-floating cells.

Biofilm challenges include:

• Reduced penetration of heat and disinfectants

• Protection for Legionella inside protozoa and amoebae

• Higher resistance to sanitizers and antibiotics

• Continuous shedding of bacteria downstream, even after flushing

This is why shock treatments or one-time disinfection events rarely solve the root problem. Biofilm requires ongoing control and monitoring, not reactive responses.

How to Control Biofilm in Healthcare Water Systems

Effective biofilm control combines strong operational practices with targeted treatment strategies.

1. Maintain a Robust Water Management Program

Map the water system, define control limits, establish corrective actions, and document performance fully aligned with CDC and Joint Commission EC.02.05.02 requirements.

2. Reduce Water Age and Stagnation

Flush low-use outlets regularly. Address dead legs or unused branches. Keep water moving.

3. Monitor Key Water Quality Metrics

Track:

• Temperature

• Free and total chlorine

• pH

• ORP

• Conductivity

• ATP (for microbial activity)

  
  

These indicators reveal when biofilm risk is rising before Legionella results show a problem.

4. Use Biofilm-Focused Water Treatment

Secondary disinfection systems and advanced oxidants penetrate biofilm more effectively than traditional methods.

5. Validate With Microbial Testing

Routine Legionella testing and ATP trending confirm whether biofilm control efforts are working.

How Legionella Specialties Supports Biofilm Control

Legionella Specialties partners with healthcare facilities to create measurable, compliant, and effective biofilm control programs.

Our services include:

• Joint Commission-ready water management plans

• Biofilm risk assessments and system mapping

• Targeted biofilm-penetrating water treatment strategies

• Routine monitoring and documentation

• Legionella testing, ATP trending, and water quality reporting

We help you stay compliant while improving patient and resident safety.

Turn Biofilm Awareness Into Action

Biofilm Awareness Week is the perfect time to re-evaluate your water management strategy and confirm your facility is controlling the conditions that allow biofilm, and Legionella, to thrive.