Posted By David Matthew Do you have any water storage tanks including cisterns and what temperature does the water from the hot tap come out at? I'm not an expert nor do I currently have the guidance notes with me but from memory legionella thrives in water with a temperature between 20-60 degrees C so heated water must reach a certain temperature within a minute of turning the tap on I think - I'm sure other will correct me if I'm wrong or provide more narrative. Things to look out for are dead legs where water can stagnate and legionella multiply, storage tank with a film on top of them which provides nutrients for the bacteria to grow, overflow pipe taht don't have a mesh over the end of them allowing flies etc to get into the tanks/ cisterns etc. I believe that the population at risk tends to be the old and the very young and people with a suppressed immune system. Hope this helps, regards, David

Posted By ITK Carsten you will find all you need here. http://www.hse.gov.uk/legionnaires/info.htm

Posted By John A Wright Jeff, can you run that by again. You said >>If you store water (cold or hot) in something other than the rising water mains services pipes, you have a low risk. Then you said >>mains water, no storage equals low risk. So they are both low risk??? :0)

Posted By holmezy While we are on about legionella..... My service provider, who shall remain nameless, always tries to convince me that a flushing toilet is a medium to high risk. We have 2 flushing toilets, one from stored water, the other from mains, yet he sees no differential in risk. All of the bug counts are ok from the tank, and all temperatures are either cold enough or hot enough, yet he tells me the aerosol produced by the toilet is whafted around by the opening and closing of the cubicle door. I, personally, see little or no risk in either and am certainly not in the habit of sniffing toilet systems whilst at knee height! Is it just me, or have others had the same? Holmezy