According to this article dirty ice is being served at one in every three pubs, restaurants and coffee shops and could be putting customer health at risk. A study carried out by the Health Protection Agency on 88 establishments found that 30% showed levels of poor hygiene. The main problems are caused by the failure to clean machines and scoops used to fill cups and glasses. 30% of ice samples were found to have unsatisfactory levels of coliform bacteria whilst three samples had unsatisfactory levels of Enterococci and one sample had an unsatisfactory level of E.coli. Based on this, next time you are offered ice you might be wise to say no.