Escherichia coli

2006

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Table of Contents

• 1.0 Guideline
• 2.0 Executive Summary for Microbiological Quality of Drinking Water
  • 2.1 Introduction
  • 2.2 Background
  • 2.3 Bacteria
  • 2.4 Health Effects
  • 2.5 Exposure
• 3.0 Application of the Guideline
  • 3.1 Public Drinking Water Supply Systems
    • 3.1.1 Testing Requirements
    • 3.1.2 Notification
    • 3.1.3 Corrective Actions
  • 3.2 Semi-Public and Private Drinking Water Systems
    • 3.2.1 Testing Requirements
    • 3.2.2 Notification
    • 3.2.3 Corrective Actions for Disinfected Supplies (Surface Water Supplies and Groundwaters Under the Direct Influence of Surface Waters)
    • 3.2.4 Corrective Actions for Non-Disinfected Wells
• 4.0 Significance of E. coli in Drinking Water
  • 4.1 Description
  • 4.2 Sources
• 5.0 Role of E. coli as an Indicator of Microbiological Safety
• 6.0 Role of Disinfectant Residuals in Maintaining Drinking Water Quality
• 7.0 Analytical Methods for E. coli
  • 7.1 Presence-Absence Procedure
  • 7.2 Membrane Filter Procedure
  • 7.3 Multiple Tube Fermentation Procedure
• 8.0 Sampling for E. coli
  • 8.1 Sample Size
  • 8.2 Sampling Frequency
  • 8.3 Location of Sampling Points
  • 8.4 Handling of Samples
• 9.0 Treatment Technology
  • 9.1 Municipal-scale
  • 9.2 Residential-scale
• 10.0 Conclusions and Recommendations
  • 10.1 Drinking Water Quality
  • 10.2 Relationship with Pathogenic Microorganisms
  • 10.3 Sampling Frequency and Sampling Size
• 11.0 References
• Appendix A: Decision Tree for Routine Microbiological Testing of Public Systems
• Appendix B: Decision Tree for Routine Microbiological Testing of Semi-Public and Private Systems
• Appendix C: List of Acronyms