What to do when an augmented-care water outlet tests positive for Pseudomonas

Bring the result to the water safety and clinical teams

A laboratory reports Pseudomonas aeruginosa from a tap in a neonatal unit, critical-care area or other augmented-care setting. A result is a warning that needs prompt, coordinated interpretation. It is not enough to file the laboratory report in an estates folder or to place a sign on the tap without checking who uses it and how. Patients in augmented care may have greater vulnerability to waterborne infection, and the same outlet can be used for handwashing, cleaning and patient-related tasks.

Confirm the result details. Which outlet was sampled, on what date and by what method? Was the sample taken before or after flushing? Was a point-of-use filter fitted? Were there other samples from the same room or system? What does the laboratory report actually measure and which sampling protocol was used? The NHS England HTM 04-01 Part B links results to nominated estates and infection prevention members of the water safety group. A single number without its sample position and method can be misread.

Inform the water safety group, infection prevention, microbiology, estates and the affected clinical team through the local urgent route. HTM 04-01 Part B advises a focused incident control meeting when risk assessment or testing identifies Pseudomonas contamination. The group should prioritise patient safety and form an action plan. This is a multidisciplinary decision. A contractor can explain a pipe or outlet, while a clinician can identify current patients and procedures. Neither perspective alone is sufficient.

Record immediate restrictions clearly. The responsible leads should decide whether the outlet can be used for any purpose, whether it needs a point-of-use filter, whether alternative water is required and which patients or tasks are affected. A positive finding does not automatically mean every tap in the building is unsafe, but its scope must be investigated. The decision should state the outlet identifier, room, permitted uses, prohibited uses, start time and next review. Staff need an instruction they can apply during care, not a vague warning to “be careful with water.”

Match the water use to the patient risk

HTM 04-01 Part C focuses on additional measures for augmented-care units. It advises that water used for direct contact with susceptible patients should have known satisfactory quality. Its examples include water that testing has shown free of Pseudomonas, water supplied through a suitable point-of-use filter, or sterile water for particular neonatal skin contact. The choice depends on the task and clinical advice. Do not treat ordinary bottled drinking water as equivalent to sterile water for every use.

List how the outlet is used. Does it supply a clinical handwash basin, shower, equipment cleaning point or patient washing area? Could droplets splash a preparation surface or medical device? Are patients with indwelling devices, open wounds or severe immunosuppression nearby? The Part C guidance asks providers to consider direct and indirect contact and to review outlets that may expose augmented-care patients. A tap that patients never touch can still influence a clinical process through staff hands, equipment or splashing.

Ask the clinical team to review patients who may have been exposed before the result arrived. The review may consider dates, use of the outlet, clinical condition and any relevant infection information. A positive environmental sample is not proof that a patient has acquired an infection from that outlet. Any patient testing, treatment or notification must be set by the clinical and microbiology teams. Keep identifiable details in clinical records. The water incident log can record that patient review was assigned and completed without duplicating private clinical data.

Provide a safe working alternative. A restricted wash-hand basin cannot simply disappear from an infection prevention plan. Identify another approved handwashing point or an agreed control for the activity. If patient washing or equipment cleaning is affected, specify the replacement water and process. Part C discusses known satisfactory quality and appropriate options for cleaning patient contact equipment, subject to manufacturer instructions. Do not ask staff to invent an alternative decontamination method at the bedside. If no safe substitute exists, the clinical lead may need to change or pause the activity.

Make the restriction workable on a live unit

A control can look clear in a meeting and fail in the room. Walk the unit with the nurse in charge and the infection prevention lead. Point to the restricted outlet and the alternative for every routine task that used it. If the sink is the only convenient handwashing point, establish how hand hygiene will be performed at the right moment without crossing a contaminated route. If a point-of-use filter is selected, show staff how to recognise a loose or expired fitting and whom to call. If sterile water is required for a defined neonatal task, confirm where it is kept and how it reaches the bedside. A notice that says only “tap out of use” does not answer any of these questions.

Check that cleaning staff and temporary clinicians receive the same instruction. Ask someone who was not at the incident meeting to explain it back. Record any part of the process that staff cannot actually perform during a busy shift. Revise the plan before relying on it. Keep ordinary domestic uses and direct patient contact separate in the instruction, since the water quality decision may differ by task. Record each change and its authorising clinical lead.

Interpret the sample within the water system

The water safety group should ask whether the finding is confined to an outlet or suggests a wider system issue. HTM 04-01 Part B discusses pre-flush and post-flush results and how patterns can point toward a local outlet problem or a broader water-supply problem. It also suggests plotting results on system drawings and taking additional samples where the pattern warrants it. These are specialist interpretations. This article does not turn a particular count into an automatic instruction to close a ward.

Check the sampling chain. A sample collected or transported incorrectly can mislead, while an inadequate sampling plan can miss the true extent. Confirm the written protocol, laboratory competence, outlet location, timing and any treatment or filter in place. Retesting should answer a defined question, such as whether a local outlet intervention worked or whether adjacent outlets share the problem. Repeated samples without a hypothesis may consume time while patients remain exposed to an unclear control.

Map the physical system. Which hot and cold branches, mixing valves, outlet types and return paths serve the affected room? Are there little-used outlets or dead legs? Were taps recently replaced, serviced or cleaned? Is the point-of-use filter correctly specified and managed? Have pressure or temperature conditions changed? The water safety plan should hold current drawings and a history of maintenance and sampling. If the as-built plan is uncertain, make that uncertainty visible before a repair or release decision.

Consider the outlet environment. HTM 04-01 Part C warns that clinical wash-hand basins can be contaminated through poor cleaning order, splash and drainage. It advises that such basins should be for handwashing, not disposal of body fluids or washing patient equipment. Review whether the basin is used as designed. A clean pipe network can still feed an outlet whose spout or surrounding area is repeatedly contaminated. Conversely, simply changing a tap will not solve a branch or storage problem. The investigation should distinguish these possibilities.

Control the affected outlet while investigating

If the outlet is taken out of normal use, decide how the system will be managed meanwhile. HTM 04-01 Part B advises continued daily flushing of an outlet taken out of service because of Pseudomonas contamination, to avoid stagnation and worsening contamination. That needs a safe written procedure so staff do not accidentally use or aerosolise restricted water near patients. The water safety group should specify who performs the task, how it is recorded and how it fits with patient-area restrictions. A “do not use” sign alone does not manage the stagnant branch behind the tap.

A point-of-use filter can be part of the risk control where selected by specialists. Part C defines a filter and includes filtered water among examples for direct patient contact. The filter must be compatible with the outlet and its use, installed and changed according to its specification, and protected from external contamination. A filter on the spout does not repair the underlying water system. It may be an interim protection while investigation and remedial work continue. Do not assume that attaching any filter makes every clinical use safe.

Review cleaning and splash controls. Part C advises that taps be cleaned before the rest of the clinical wash-hand basin to avoid transferring organisms from the basin to the outlet. It also calls attention to splash from outlet design, pressure and drain position. The estates and infection prevention teams may need to change a fitting, cleaning method or use pattern. Avoid an unapproved change that creates a scald risk or conflicts with another water safety control. Tap and mixing-valve selection should be considered within the water safety plan.

Maintain clear staff communication. Affected rooms may have day, night, agency, cleaning and maintenance staff who need different instructions. Put a current notice at the outlet and issue a unit briefing that says exactly what water source to use for each relevant task. Tell staff whom to contact if the filter becomes loose, a sign falls off or a patient care need cannot be met. Record when instructions change. The goal is a controlled clinical process, not a general warning that increases uncertainty and encourages workarounds.

Investigate root causes and remedial options

The cause may involve an infrequently used outlet, pipework that retains water, a mixing arrangement, tap design, cleaning practices, an upstream water quality issue or several factors together. Use the sample pattern, system diagram, maintenance history and observations. HTM 04-01 Part B lists measures to consider after a contamination problem is identified, including reviewing flow straighteners, splashing, little-used outlets and redundant pipework. It does not prescribe every measure for every site. Water engineering, infection prevention and clinical leads should choose a proportionate plan.

If a component is cleaned or replaced, record exactly what changed. A tap replacement may need isolation, decontamination and commissioning steps. A change to a mixing valve can affect scald control as well as microbiological risk. Removing an unused outlet may require cutting back its branch pipework so a stagnant dead leg is not left. The provider should not treat a hardware swap as complete before the water safety group has reviewed the design and the relevant water quality evidence.

Check maintenance and flushing records. Part C highlights regular flushing of infrequently used outlets in augmented-care units and keeping records. Missed tasks may explain stagnation, but a completed tick sheet does not prove the outlet was flushed correctly. Observe the procedure and assess whether it is feasible on all shifts. If staff are meant to flush an outlet that is restricted for clinical use, make the safe method explicit. A task may have been skipped because access was blocked or responsibility was unclear, which a reminder alone will not fix.

Review whether the water safety plan has a timely result route. Who receives a laboratory result on a Friday evening? How is the affected outlet linked to a room and patient cohort? Who decides on a filter, alternative water or temporary service change? Who speaks to the clinical team? The investigation should expose gaps in these handovers. The control is stronger when a result immediately reaches the people who can protect patients and act on the system.

Prove sustained control before normal use resumes

A repair may be technically complete before the outlet is ready for normal clinical use. The water safety group should define the evidence needed to lift restrictions, including any follow-up sampling, system performance, filter status and patient-care controls. Microbiology and infection prevention should interpret the results in context. Do not announce that a tap is safe merely because it looks clean or one sample has changed. Equally, do not leave an indefinite restriction in place with no review plan or safe alternative.

Keep engineering and clinical release distinct. Estates can confirm the system configuration, repair and maintenance tests. The clinical and infection prevention teams can confirm whether the intended patient use is acceptable. Record who authorised each decision and when. If the outlet remains on a filter or limited use, describe that as a controlled state rather than a full return to the earlier condition. Ensure the next shift sees the current status in the unit's own handover process.

Review adjacent outlets and the wider pattern. If the result suggested a broader supply issue, the remediation and sampling scope should reflect it. If only one outlet was affected, ask what makes it different, such as usage, design or cleaning. Plotting results against system drawings can help demonstrate whether the intervention addressed the likely cause. Continue the monitoring plan set by specialists rather than stopping all checks after the first acceptable report.

Document patient and service outcomes. Were any activities paused or moved? Did the unit use alternative water correctly? Were there near misses where staff used a restricted outlet? Did a patient need a clinical review? Keep the clinical details secure but record the operational lessons. A page of laboratory results does not show whether the controls reached the bedside. Evidence of staff understanding, correct alternative use and clear release is part of the safety case.

Where Complys may fit

The Complys hospitals page and healthcare facilities checklist discuss water safety evidence. A provider could hold the water safety plan, outlet inventory, contractor records, sample result references and corrective actions in an administrative system if the actual product supports them. Public Complys material does not establish that it analyses microbiology, maps a water network, controls a point-of-use filter, judges patient exposure or releases an outlet for clinical use. Those are specialist responsibilities.

A useful record would link each sample and action to an outlet identifier, room, interim restriction, responsible person and final status. It would separate engineering evidence from clinical release and keep patient details in the proper clinical system. This is an editorial use case, not a verified feature. The product owner must confirm field design, permissions and audit history before any site copy says Complys performs it.

CTA: Review Complys for hospitals and ask to see the water safety evidence and action workflows currently available. Related tool opportunity: An outlet-status worksheet showing sample reference, location, patient uses, interim restriction, alternative water, engineering action, follow-up evidence and separate clinical release. It must not interpret microbiology automatically. Suggested internal links out: Positive Legionella sample response, healthcare water supply interruption, Complys hospitals. Suggested links in: Hospitals page, broad healthcare facilities checklist and water supply interruption guide when an outlet restriction affects service continuity. Cannibalisation boundary: This page owns Pseudomonas detected in a water outlet serving augmented care, with patient-specific contact and outlet controls. Draft 40 owns a positive Legionella sample and its different exposure and regulatory pathway. Draft 62 owns loss or restriction of usable water as a utility continuity event. Do not create a page per ward, sample count or tap design.