In healthcare, water quality affects patient safety in direct and indirect ways-from showers and handwashing outlets to equipment that uses water in cleaning and reprocessing. Because many patients have heightened susceptibility to opportunistic pathogens, healthcare water programs need a higher level of design, monitoring, and governance than typical commercial settings.
AS/NZS 5369:2023 (as amended 2026) (reprocessing of reusable medical devices) has strengthened expectations for how facilities manage water used in reprocessing. In practical terms, facilities need to understand which reprocessing steps require higher-quality water, demonstrate that treatment systems consistently achieve the required specification, and maintain monitoring and records that stand up to accreditation and regulatory scrutiny. This article summarises the core water-related requirements and the controls that typically matter most.
Healthcare water risk profile (what makes hospitals different)
- – Higher consequence of exposure: immunocompromised, neonatal, elderly, and other high-risk patients may be affected by pathogen levels that would not harm healthy adults.
- – Complex plumbing and many outlets: large campuses have long runs, variable demand, and mixed-temperature zones that can promote stagnation and biofilm.
- – Opportunistic premise plumbing pathogens (OPPPs): healthcare settings need to consider a broader range of organisms beyond Legionella (see Opportunistic Pathogen Control Beyond Legionella – Evidence-Based Options for Complex Water Systems).
- – Special water uses: reprocessing areas, ice machines, humidifiers, and other equipment can introduce additional exposure pathways and quality requirements.
- – Assurance expectations: water controls must be governed, verified, and documented as part of clinical governance and infection prevention programs.
What AS/NZS 5369 means for water (in plain terms)
AS/NZS 5369 requires facilities to treat water used in device reprocessing as a controlled input to patient safety. The focus is not on a single “one-size” number; it is on demonstrating that the water quality used for each critical reprocessing step is fit for purpose, consistently achieved, and verified.
- – System understanding: document where reprocessing water comes from, how it is treated, stored, and distributed to points of use (including any final filters).
- – Treatment and distribution controls: specify the treatment steps needed to meet the required quality (commonly including processes such as reverse osmosis/deionisation and microbial control where required) and ensure the distribution does not re-contaminate the water.
- – Operational monitoring: routine checks that confirm the treatment system is operating within expected parameters (e.g., key water quality indicators and equipment condition).
- – Verification monitoring: scheduled testing (microbiological and relevant chemical parameters) to demonstrate the water delivered at the point of use meets the facility’s defined specification.
- – Corrective action: clear response pathways if results exceed action limits, including investigation, remediation, and decisions about instrument quarantine/reprocessing as appropriate within the facility’s quality system.
AS/NZS 5369:2023 (as amended 2026) addresses these risks by specifying water quality requirements for different stages of medical device reprocessing.
Healthcare water quality services: what good support looks like
- – AS/NZS 5369:2023 (as amended 2026) readiness and gap assessment: confirm the required water specification for your reprocessing steps and identify practical actions to close gaps.
- – Sampling and monitoring program design: define locations, frequency, parameters, action limits, and escalation aligned to your risk profile and quality system.
- – Independent validation support: verify that treatment and distribution systems are fit for purpose after installation/change, and that performance is stable over time.
- – Broader building water risk management: integrate end-point controls (see End-Point Water Management and Sampling – Managing Risk at the Outlet) and opportunistic pathogen considerations with infection prevention governance.
- – Incident support: structured investigation, remediation planning, and post-action verification to support patient safety and organisational assurance.
- – Governance and capability: documentation, training, and reporting that supports NSQHS expectations and board-level assurance (see Water Governance Frameworks and Board-Level Advisory – Building Accountability and Assurance).
Where this matters most (common healthcare settings)
- – Acute hospitals: complex campuses with high patient acuity and multiple specialised water uses need strong governance and trend visibility.
- – Regional and rural facilities: the same expectations often apply, but operating models may need central oversight and capability uplift (see Regional and Remote Water Management – Practical Stewardship from Mine Sites to Communities).
- – Aged care: end-point controls and routine assurance focus on protecting residents with higher susceptibility.
- – Day surgery, dental, and specialist clinics: reprocessing water controls should be proportionate, clearly documented, and audit-ready under AS/NZS 5369:2023 (as amended 2026).
Standards and expectations to align to
- – AS/NZS 5369:2023 (as amended 2026) for water used in reusable medical device reprocessing (fit-for-purpose quality, monitoring, and records).
- – ADWG risk management principles for drinking water quality management and assurance.
- – NSQHS Standards (particularly infection prevention and clinical governance), where water safety evidence supports broader patient safety obligations.
- – AS/NZS 3666 where cooling systems are present (see also Opportunistic Pathogen Control Beyond Legionella – Evidence-Based Options for Complex Water Systems for pathogen control considerations).
- – State/territory health guidance for healthcare water risks (including local Legionella requirements), applied to your operating context.
Healthcare water quality services map to all stages of the Ecosafe Water Journey:
Conclusion
Healthcare water programs work best when technical controls are paired with strong governance: clear specifications for reprocessing water, reliable treatment and distribution, and monitoring that produces defensible evidence over time. With AS/NZS 5369 now setting clearer expectations, facilities that take a practical, risk-based approach can strengthen patient safety, support accreditation readiness, and build board-level assurance that water is being managed as a clinical risk-not just a facilities issue.
