E. coli bacteria were found in the water supply near Phantom Ranch at Grand Canyon National Park officials warned Friday . Bacteria can make you sick and are a particular concern for people with weakened immune systems . As of right now the only affected area is Phantom Ranch and the immediate vicinity . Bacterial contamination can occur when increased runoff enters the drinking water source . It can also happen due to a break in the distribution system or a failure in the treatment process . Officials urged individuals in the affected area to boil water before consuming it until further notice . E.coli H can cause additional complications in children and the elderly renal failure anaemia and dehydration especially for children and spontaneous bleeding organ failure and mental changes in the elderly . Some of these patients develop permanent disabilities or die. Some of the patients develop . Some patients develop temporary disabilities or . die. Officials urge individuals to boil the water in order to avoid being infected by E. Coli bacteria. The bacteria are normal inhabitants of the human intestine also animal intestines and are usually harmless. Under certain conditions E.Coli may increase in number and cause infection. under certain conditions. Under . certain conditions in children or the elderly. It is the cause of gastroenteritis in children particularly in tropical countries. In adults it is the source of travellers diarrhoea and of of all urinary tract infections. Some people develop permanent . symptoms or die . Some people developing permanent disabilities. Some patients developed permanent disabilities . Officials said. Some symptoms of E. Ostechnics. may develop behavioural changes or symptoms of the symptoms of an illness that can be described as ‘undundundated’. The symptoms of Ostegangan’s ‘diseases’ are described as