The current site escalation procedure
Use the written scheme, incident plan and named competent contacts; this hub cannot replace them.
Open the response guides ›Control-failure response
Respond to a Legionella control failure without losing the evidence trail
Separate urgent exposure or health escalation from technical diagnosis, follow the site scheme and record how restrictions, investigation, remediation and handback decisions were made.
Prerequisites
Have these in place before treating the sequence as actionable.
Unchanged original evidence
Preserve readings, sample details, alarms, dates, affected assets and actions without retrospectively correcting the record.
Open the incident record ›Decision steps
Work through the questions in order. Follow current site instructions and competent advice where they set a different or more specific route.
Check for urgent health or exposure escalation
Ask: Is there a suspected case, illness concern, public-health instruction or uncontrolled aerosol exposure?
Follow emergency, clinical and public-health routes immediately where relevant; do not use this website to diagnose or delay contact.
Open public and health guidance ›Identify the failed control or adverse information
Ask: Is this a temperature observation, missed task, system defect, treatment issue, positive result or repeated failure?
Record the observation and context; do not infer cause from one result or threshold alone.
Route a failed temperature check ›Apply the site-specific escalation boundary
Ask: What restriction, isolation, retest or specialist decision does the written scheme require?
Use competent authority for site actions. Do not improvise chemical treatment, exposure restrictions or handback criteria.
Route a positive sample ›Investigate cause and affected scope
Ask: What systems, outlets, people, dates and control barriers could be relevant?
Keep hypotheses separate from confirmed findings and preserve chain-of-custody and contractor evidence.
Review repeated-failure factors ›Verify corrective action and controlled handback
Ask: What evidence and authority are required before normal operation resumes?
Record acceptance criteria, verification results, residual actions and who authorised handback; treatment alone is not proof of safety.
Use the treatment evidence record ›
Next steps
Maintain an owned corrective-action trail
Keep priority, owner, due trigger, evidence and close-out review together.
Open the action tracker ›Review whether the assessment and scheme remain valid
A failure or new result can be a review trigger even when a calendar review is not due.
Check review triggers ›Cite this page
"Respond to a Legionella control failure without losing the evidence trail." Legionella.io. https://legionella.io/tasks/control-failure-response/
Free to reuse under CC BY 4.0: quote, adapt or republish with attribution and a link back to the original.
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