Document name: Maintenance & Operational Procedures for the control of Legionella, water hygiene, ‘safe’ hot water, cold water, drinking water and non-drinking water. Document type

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2.21 Cleaning and Disinfection

Water systems will be cleaned and disinfected under the following circumstances:

System / Service	Circumstance Requiring Cleaning and Disinfection	Frequency	File Section
Domestic cold water tank	New installations and small modification/ additions.	As required	B.2
	Empty tank re-commissioning.	As required	C
	Tank temperature exceeds 20^oC.	As required	A.4
	Tank contains moderate sediment, i.e. a complete covering of the tank base.	As required	C
	Tank contains moderate corrosion.	As required	C
	Contamination of tank by vermin or vermin faeces.	As required	C
	Gross organic contamination e.g. large number of dead insects.	As required	C
	Regular programme for high risk healthcare category.	Annually	C
	Regular programme for medium risk healthcare category.	Annually	C
	Regular programme for non-healthcare premises [excluding small tenanted residential properties].	As required	C
	Consultant advice - interpretation of microbiological results	As required	A.4
Domestic cold water distribution system	New installations and small modification/ additions.	As required	B.2
	Contamination of system by vermin or vermin faeces.	As required	A.4
	Gross organic contamination e.g. large number of dead insects.	As required	A.4
	Consultant advice - interpretation of microbiological results.	As required	A.4

System / Service	Circumstance Requiring Cleaning and Disinfection	Frequency	File Section
Domestic hot water generator	New installations and modifications / additions.	As required	B
	DHW Generator falls below 45^oC.	As required	A
	Empty DHW Generator re-commissioning.	As required	C
	Contamination of header tank by vermin or vermin faeces.	As required	A
	Regular programme [excluding small tenanted residential properties].	Annually	A
	Consultant advice - interpretation of microbiological results.	As required	A
Domestic hot water distribution system	New installations and modifications / additions.	As required	B
	Contamination of system by vermin or vermin faeces.	As required	A
	Consultant advice – interpretation of microbiological results.	As required	A
Air handling unit	Contamination by vermin or vermin faeces.	As required	A
	Gross organic contamination e.g. large number of dead insects.	As required	A
	Chiller battery, drip trays, humidifiers and drainage pipework.	Quarterly* Biannually**	C C

* Critical ventilation plant

** Non critical ventilation plant

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