When should a business arrange a water supply check?
A business should arrange a water supply check before occupying new premises, after alterations to the supply or plumbing, and whenever contamination, stagnation or another water safety concern is suspected. It should also be scheduled as part of ongoing, risk-based water hygiene management, with the frequency determined by the building, its water systems and the people using them.
A water supply check should be arranged whenever there is a reasonable possibility that the condition, use or management of a water system has changed. The timing should be risk-based rather than determined by one universal interval, because a small office, care setting, manufacturing site and multi-occupancy building may present very different water safety risks.
Arrange a review when the building or its use changes. Changes in occupancy, the introduction of higher-risk users, altered working patterns or periods of reduced building use can affect water demand and stagnation. A check can establish whether outlets, storage arrangements, temperature controls and monitoring procedures remain suitable for the way the premises now operate. It is also appropriate when responsibility for managing the water system passes to a new facilities team, landlord or managing agent, so that existing information and controls can be verified rather than assumed.
Arrange one after shutdowns and recommissioning. A prolonged closure, partial occupation, plant failure or interruption to normal water use can leave water standing in tanks, pipework and little-used outlets. Before normal operations resume, the system should be reviewed and any necessary flushing, cleaning, disinfection, sampling or remedial work identified. The required action depends on the system design, the length and nature of the interruption, and the findings available at the time.
Do not wait for a scheduled review if there are warning signs. A check should be considered where people report unusual taste, odour or appearance, or where there is discolouration, sediment, unexpected temperature behaviour, reduced flow, leakage or repeated problems at particular outlets. These signs do not by themselves prove contamination, but they can indicate defects, stagnation, ingress or inadequate control that warrants investigation.
- Unfavourable or inconsistent water test results
- Failure to achieve required hot or cold water control temperatures
- Repeated flushing, cleaning or disinfection issues
- Changes to tanks, pumps, calorifiers, treatment equipment or distribution pipework
- Flooding, supply interruption or another event that may have affected water quality
- A suspected case or cluster of illness potentially associated with the premises
Where contamination is suspected, the matter should be escalated promptly to a competent water hygiene professional. Depending on the circumstances, immediate precautions may include restricting access to affected outlets, preserving relevant records and arranging appropriate testing or remedial action. Sampling alone is not a substitute for examining the system and its controls, since a result represents conditions at the point and time of sampling.
Include checks within planned water safety management. A business should set review points based on the complexity of its systems, the building population, previous findings, operational changes and the effectiveness of existing controls. Records should show why the review date was chosen, what was examined, which risks were identified and when outstanding actions will be reassessed. A review may confirm that current arrangements remain suitable, or it may show that the monitoring programme, risk assessment or remedial plan needs updating.
Businesses should also allow enough time for access to plant rooms, tanks, outlets and maintenance records when arranging a check. Providing information about recent works, shutdowns, complaints, test results and control readings helps the assessor distinguish an isolated issue from a recurring system weakness. Blue Fish Water Management can support this process through legionella risk assessments, water testing, compliance audits, monitoring and remedial advice tailored to the premises and its water systems.
A water supply check can be arranged during the design and commissioning of a new or substantially modified system, before it enters routine use. Reviewing the proposed arrangement at this stage can identify inaccessible plant, unnecessary dead legs, unsuitable storage, inadequate outlet provision or monitoring requirements that may be difficult and costly to correct later.
The commissioning check should consider whether the installed system matches the design, whether flushing and disinfection have been completed where required, and whether temperature controls, access arrangements and monitoring responsibilities are clearly established. Completing this review before regular use gives the responsible person evidence that the supply has been assessed and that any outstanding issues have been assigned for correction.
Arrange a Water Supply Check
Contact Blue Fish Water Management to discuss the appropriate water supply check for your premises and its current operating conditions. Our team can help determine the scope of review and identify the information needed before the assessment.