Reopen a building after low use

Water that has sat still is higher risk. Bring the system back under control before people use it again.

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1. Understand why stagnation mattersKnow what changed in the water while it sat still.Neglected water systems: the danger of stagnation ›
2. Plan the flush-throughWork out volumes and flushing times for the outlets you are recommissioning.Outlet flushing time ›
3. Flush and restore temperaturesBring hot water back up to temperature and flush every outlet; record it.Flushing record sheet (low-use outlets) ›
4. Consider sampling or disinfectionFor higher-risk systems or long closures, consider sampling or disinfection on advice.What to do if you get a positive Legionella test ›
5. Resume routine monitoringRestart the normal monitoring schedule and logbook.Legionella temperature monitoring log ›

Progress is saved in this browser only. General guidance, your risk assessment and a competent person make the final call.

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"Reopen a building after low use, playbook." Legionella.io. https://legionella.io/do/reopen-after-low-use/

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