Alpine E coli 0157 H 7 Outbreak Barbara

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Alpine E. coli 0157: H 7 Outbreak Barbara Barron Drinking Water Program U. S. EPA Region 8

Municipal Water Supply - Alpine SPRING Established 1975 POND STORAGE 50, 000 Gal. WELL #2 WELL #1 Cattle tap STORAGE 250, 000 Gal. Residential taps PUMP HOUSE Intermittent Disinfection TO DISTRIBUTION STORAGE 750, 000 Gal. TO DISTRIBUTION

History of Bac. T Samples in 1998 April: Total coliform positive Repeat samples negative May: Total coliform positive Repeat samples negative June: Total coliform positive Repeat samples negative

PRE-OUTBREAK TECHNICAL ASSISTANCE è Site Visit by Contractor è Chlorination Performed è Continuous Chlorination Recommended

Immediate Local Action Under Boil Order WELL #2 WELL #1 POND SPRING STORAGE 50, 000 Gal. Shut valve Cattle tap Install fire hydrant STORAGE 250, 000 Gal. Residential taps PUMP HOUSE Manual Chemical Disinfection TO DISTRIBUTION STORAGE 750, 000 Gal. TO DISTRIBUTION Daily TC Sampling

STATE ACTION èBoil Order Continued è Investigation Launched è Assistance Requested from CDC & EPA

Action Under EPA Administrative Order SPRING POND STORAGE 50, 000 Gal. WELL #2 Shut valve WELL #1 Install fire hydrant Cattle tap Sever Line STORAGE 250, 000 Gal. Residential taps PUMP HOUSE Continuous Disinfection TO DISTRIBUTION STORAGE 750, 000 Gal. TO DISTRIBUTION

EXAMINING SPRING BOX Analytical Findings Spring Pond: Total Coliform + Fecal Coliform + Enterococcus species + Clostridium perfringens + Storage Tank: Total Coliform + E. coli + Enterococcus species + Clostridium perfringens +

CHANCE OF ACQUIRING INFECTION CDC Data for Exposure Period 6/25/98 - 7/01/98 ä Residents who drank Alpine water vs. residents who did not drink Alpine water Eight times more likely to acquire infection ä Visitors who drank Alpine water vs. visitors who did not drink Alpine water Fourteen times more likely to acquire infection ä 99. 99% certainty that municipal water supply was source of outbreak

Little Jenny Pond/Mill Creek Spring 50 K gal tank Pond

Fence Surrounding Spring Collection Area Fa lle n. F en ce

Cattle Corral First Service Connection se Ho bb Bi

Alpine Test Results for Classic Contaminants Contaminant Name Test Date Result Inorganics 12/06/93 Within limits Pesticides 11/10/97 Not Detected Radionuclides 11/10/97 Not Detected Nitrate/Nitrite 11/10/97 Not Detected Volatile Organics 12/06/93 Not Detected Unregulated 11/10/97 Not Detected Pb/Cu 01/01/98

Where Do We Go From Here? Direct Implementation Program A. Sanitary Survey Triage B. Develop 24 hr. Emergency Protocol C. Strengthen Ties with State Agencies D. Pilot SWP Program at Alpine E. Enhance Internal Procedures F. Continuing Technical Assistance to Alpine

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