Escherichia coli

2006

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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
	2.6	Treatment

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
	10.4	Considerations for the Treatment of Raw Supplies

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


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	Last Updated: 2006-05-04		Important Notices

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