As dental professionals, maintaining a safe clinical environment is essential to minimise risks to patients and staff. While instrument reprocessing is well recognised, the quality of water used in dental units is equally critical.
According to AS/NZS 5369:2023, water used in dental procedures must be managed to ensure it is fit for purpose and does not pose a risk of infection. Poorly maintained dental unit waterlines (DUWLs) can support microbial growth and biofilm formation, which may compromise patient safety.
Implementing a structured water quality management program—including monitoring, treatment, and documentation—supports compliance and reduces clinical risk.
Risks Associated with Inadequate Waterline Management
Dental unit waterlines can develop biofilms, which are complex microbial communities that adhere to internal surfaces. These biofilms may contain bacteria, fungi, and protozoa.
If not effectively controlled, microorganisms can be released into the water used during dental procedures and may become aerosolised, increasing the risk of exposure for both patients and staff. Organisms of concern include:
- Legionella spp.
- Pseudomonas aeruginosa
- Non-tuberculous mycobacteria (NTM)
These microorganisms are associated with respiratory and opportunistic infections, particularly in vulnerable individuals.
In addition, contaminated water can contribute to cross-contamination of instruments, handpieces, and environmental surfaces.
AS/NZS 5369:2023 emphasises that water used in patient care must be of a quality appropriate to its intended use and managed within an infection prevention and control (IPC) framework.
Managing Dental Unit Waterlines: Key Requirements
To meet the expectations of AS/NZS 5369:2023, dental practices should implement the following:
Water Quality Monitoring
Routine testing of microbial levels (e.g., total viable count) to verify that water meets acceptable limits for dental use.
Waterline Treatment and Maintenance
Use of validated treatment systems and protocols to control biofilm and maintain water quality within recommended parameters.
Scheduled Maintenance Program
Regular flushing, disinfection, and servicing of DUWLs in accordance with manufacturer instructions and risk assessment.
Documentation and Record Keeping
Maintenance of accurate records of testing, treatment, and corrective actions to demonstrate compliance and support quality assurance.
Risk Management Approach
Identification, assessment, and control of risks associated with water quality as part of the practice’s overall IPC program.
The Bottom Line: Water Quality is a Patient Safety Issue
Failure to monitor and manage dental unit water quality can expose patients and staff to avoidable risks and may result in non-compliance with regulatory and accreditation requirements.
AS/NZS 5369:2023 highlights that compliance is not only about meeting standards, but about ensuring safe and effective care. A proactive approach to DUWL management—through monitoring, treatment, and documentation—is essential.
Don’t wait—ensure your dental unit waterlines are effectively managed and compliant.
Maintaining water quality is a fundamental component of infection prevention and control and supports the delivery of safe dental care.