Ambient Water Quality Criteria for Bacteria - Water Quality Standards ...

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11-30-2011 Why Do We Need Bacteria Criteria? Bacteria criteria help protect against disease caused by fecal pathogens from recreational exposure to contaminated water 37% (1,362) of coastal and Great Lakes beaches were closed or had an advisory posted for at least one day in 2010 CDC continues to document cases of waterborne disease outbreaks in their 2011 “Surveillance” Report (MMWR, CDC 2011)
11-30-2011 Indicators EPA’s recommended bacteria water quality criteria (WQC) are for indicator organisms (indicating fecal contamination) Pathogens are disease-causing microorganisms that include viruses, protozoa, and bacteria Monitoring for the many fecal pathogens is difficult and costly so we monitor for fecal indicators instead
Page 1: 11-30-2011 Ambient Water Quality Cr
Page 5 and 6: 11-30-2011 Results of Studies in th
Page 7 and 8: 11-30-2011 Bacteria Criteria in Wat
Page 9 and 10: 11-30-2011 Primary Contact Recreati
Page 11 and 12: 11-30-2011 What is the BEACH Act?
Page 13 and 14: Risk Levels 11-30-2011 Key Implemen
Page 15 and 16: Geo Mean and SSM in BEACH Act Water
Page 17 and 18: 11-30-2011 Uses of the SSM Beach a
Page 19 and 20: EPA’s New/Revised Criteria Object
Page 21 and 22: 11-30-2011 Revising the Rec Criteri
Page 23 and 24: Current Thinking on the Draft RWQC
Page 25 and 26: Current Thinking on the Draft RWQC
Page 27: Take Home Messages EPA’s current

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