THIS IS AN EMERGENCY ADMIN ORDER TO THE RESPONDENT BECAUSE OF THE CONDITION OF LAKE OAHE, THE SOURCE OF WATER FOR WAKPALA WATER SYSTEM. LAKE OAHE IS MICROBIOLOGICALLY A HIGH RISK SOURCE BECAUSE OF THE PRESENCE OF LIVESTOCK AND OTHER SOURCES OF CONTAMINATION WITHIN THE WATERSHED. EPA HAS DETERMINED THAT THE LACK OF EFFECTIVE FILTRATION TREATMENT ON A HIGH RISK SOURCE MAY PRESENT AN IMMINENT AND SUBSTANTIAL ENDANGERMENT. GIARDIA AND CRYPTOSPORIDIUM MAY BE PRESENT.