If ice is handled with care, many problems can be prevented. However, the ice itself must be safe to begin with. Most commercial quantities of ice are made using ice machines or ice makers that are permanently connected to a water supply. It is the responsibility of the ice machine operator to ensure that the water supply is safe. If the water comes from a well on the premises, the water must be tested frequently. If it is connected to a municipal water supply, remember that if the authorities notify you of any problem with the water, then the ice from the ice machine may not be safe.