This Emergency Order is issued to the Northern Cheyenne Tribal Council for violations at the Birney and Muddy Cluster Water Systems. The Order is based on a loss of pressure in both distribution systems, which can cause a net movement of water from outside the pipe to the inside through cracks, breaks, or joints that are common in all water systems. Such a system failure may carry with it a high potential that fecal contamination or other disease causing organisms to enter the distribution system.