Most people assume the water flowing through their pipes is clean and safe.
However, plumbing systems can contain hidden contamination called biofilm.
Biofilm is a slimy layer of:
- bacteria,
- fungi,
- microorganisms, and
- organic material
that forms inside:
- pipes,
- faucets,
- showerheads,
- water tanks, and
- plumbing systems.
Biofilm can create ideal conditions for harmful bacteria to grow and spread.
What Is Biofilm?
Biofilm forms when microorganisms attach to wet surfaces and begin to multiply.
Over time, these microorganisms produce a sticky protective layer that helps them survive inside plumbing systems.
Once established, biofilm becomes difficult to remove because it can resist:
- disinfectants,
- chlorine, and
- normal cleaning methods.
How Biofilm Forms in Plumbing Systems
Several conditions encourage biofilm growth.
Stagnant Water
Low water flow allows bacteria to settle and grow inside pipes.
Warm Water Temperatures
Biofilm grows well in warm water, especially between:
- 25°C and 45°C
- (77°F to 113°F)
Hot water systems are especially vulnerable.
Pipe Materials
Certain pipe materials may encourage bacterial attachment and buildup.
Corrosion and Scale
Rough pipe surfaces caused by:
- corrosion,
- mineral buildup, and
- scaling
can help microorganisms cling to plumbing surfaces.
Organic Matter and Nutrients
Sediment and organic material in water can feed bacteria and support biofilm growth.
Harmful Bacteria Found in Biofilm
Biofilm can contain several dangerous waterborne pathogens.
These microorganisms may affect drinking water quality and public health.
1. Legionella Bacteria
Legionnaires' disease bacteria can grow in:
- cooling towers,
- hot water tanks,
- plumbing systems, and
- HVAC systems.
Health Risks
Exposure may cause:
- Legionnaires’ disease, or
- Pontiac fever.
People become infected by inhaling contaminated water droplets.
2. Pseudomonas aeruginosa
This bacteria is commonly found in:
- faucets,
- sinks,
- showerheads, and
- medical water systems.
Health Risks
It may cause:
- skin infections,
- pneumonia, and
- bloodstream infections.
The risk is higher for people with weakened immune systems.
3. Mycobacterium avium Complex (MAC)
MAC bacteria can survive inside biofilm in:
- hospitals,
- healthcare facilities, and
- residential plumbing systems.
Health Risks
Exposure may lead to:
- respiratory infections, and
- lung disease.
4. E. coli and Coliform Bacteria
These bacteria may enter plumbing systems through contaminated water sources.
Health Risks
Exposure may cause:
- gastrointestinal illness,
- diarrhea, and
- serious infections.
Health Risks of Biofilm
If biofilm is not properly controlled, it may lead to serious water quality problems.
Common Risks Include
- waterborne disease outbreaks,
- poor drinking water quality,
- unpleasant tastes and odors,
- discolored water, and
- bacterial contamination.
Biofilm also increases the risk of Legionella growth in:
- cooling towers,
- hot water systems, and
- large building plumbing systems.
How to Prevent Biofilm in Plumbing Systems
Preventing biofilm requires regular monitoring, cleaning, and water management.
1. Perform Routine Water Testing
Regular water testing helps identify bacterial contamination early.
High-risk facilities include:
- hospitals,
- hotels,
- long-term care homes,
- condominiums, and
- industrial facilities.
Testing may include:
- Legionella analysis,
- bacterial sampling, and
- microbial water quality testing.
2. Flush Plumbing Systems Regularly
Good water circulation helps reduce stagnant water conditions.
Regular flushing can help remove:
- sediment,
- stagnant water, and
- bacterial buildup.
3. Use Proper Disinfection Methods
Disinfection methods may include:
- thermal disinfection,
- chlorine treatment,
- chlorine dioxide,
- monochloramine, or
- other approved treatments.
Proper disinfection helps control bacteria and reduce biofilm buildup.
4. Maintain Pipes and Filtration Systems
Facilities should:
- inspect aging pipes,
- reduce corrosion,
- clean filters regularly, and
- replace damaged plumbing components.
Proper maintenance helps improve water quality and reduce bacterial growth.
Ontario Regulations Related to Water Safety
Ontario water safety requirements may apply to facilities with higher water quality risks.
Relevant regulations and standards include:
- Safe Drinking Water Act, 2002
- Ontario Regulation 170/03
- Ontario Regulation 243/07
- ASHRAE Standard 188
These regulations and standards help guide:
- water testing,
- Legionella prevention,
- microbial monitoring, and
- plumbing system management.
Why Biofilm Prevention Matters
Biofilm can create serious health and operational risks if left untreated.
Proactive water management helps:
- improve water quality,
- reduce bacterial growth,
- protect building occupants, and
- support regulatory compliance.
Regular testing and maintenance are essential for safe plumbing systems.
Professional Water Testing Services in Ontario
At Canadian Water Compliance, we provide:
- biofilm testing,
- Legionella testing,
- microbial water analysis,
- risk assessments, and
- water safety support.
We help businesses and facilities across Ontario improve water quality and reduce compliance risks.
Contact Canadian Water Compliance today to schedule professional water testing services.
