The improvement notice does not mean the National Museum of Scotland has been identified as the source of the outbreak of Legionnaires' disease.
The museum can appeal against the notice within the next 21 days.
– A spokeswoman for National Museums Scotland, which runs the museum
Tests have confirmed that there are no issues with Legionella in our cooling towers.
Following a routine inspection by the Health and Safety Executive and the City of Edinburgh Council Environmental Health, both organisations confirmed they are satisfied with our documentation and procedures.
Two other organisations, pharmaceuticals firm Macfarlan Smith and the North British Distillery, have already been served with improvement notices.
These do not mean any of the cooling towers are the source of the outbreak.