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Showgrounds and music festivals are typical examples where there are tens of thousands of visitors for a period of just a few days followed by months of inactivity.
It is essential that planners disinfect and flush all the water systems prior to the event taking place and ensure that the water quality is laboratory tested. In these instances the water should be checked for its potability (ie fit to be drunk) which entails a Drinking Water Quality Test.
When the event attracts temporary caravan and camping grounds, make sure you test the showers for legionella bacteria.