On September 8, 2015, the System reported to the EPA a loss of pressure resulting in the Mission Housing Development served by the System being without water. An on-going investigation attributes a line break to the pressure loss. Loss of pressure may cause a net movement of water from outside the pipe to the inside through cracks, breaks, or joints in the distribution system that are common in all water systems. Back siphonage also is a condition resulting from low or no pressure. Such system failures carry a high potential that fecal contamination or other disease causing organisms could enter the distribution system, posing a potential imminent and substantial endangerment to human health.