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

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11-30-2011 Rec Criteria History Federal bacteria criteria recommendations first made in 1968 • Based on PHS studies, conducted 1948-1950 Studies measured total coliforms • Recommended a limit of Fecal coliforms 200 CFUs/100 ml In 1972 EPA initiated a series of multiyear, comprehensive epidemiological studies at marine and fresh water bathing beaches
11-30-2011 Results of Studies in the 70s/80s Of the indicators measured during the studies, E. coli and enterococci showed strongest correlation to swimmingassociated gastroenteritis • E. coli and enterococci in fresh waters • Enterococci in marine waters Results described in detail in the 1986 (current) Bacteria Criteria document
Page 1 and 2: 11-30-2011 Ambient Water Quality Cr
Page 3: 11-30-2011 Indicators EPA’s reco
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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