The workshop was held on September 5 - September 7, 2001, at Fort Meade, Maryland. The workshop was organized into six sessions: I. Science Support to EPA Programs and Regions; II. Incidence and Risk Assessment of Emerging Pathogens; III. Assessing Exposures to Emerging Pathogens; IV. Emerging Pathogens Risk Management Challenges: (A. Emerging Pathogens in Drinking Water, B. Emerging Pathogens in Recreational Water); V. Pathogen TMDLs / CAFOs / Biosolids; VI. Over the Scientific Horizon - Meeting Regional Research Priorities. Regional, Office of Research and Development, and Office of Water scientists presented current work on methodologies being developed, and new data on a variety of pathogens of concern; EPA regulations or rules under development or in the process of revision, and new or improved approaches for risk assessment and risk management. The need for new and better methods as more pathogens are recognized was an often-repeated theme throughout the workshop; however, a number of the presenters described such new methods currently being developed, or, in the form of case studies, gave alternatives that have been used by regulators when a method was unavailable. The meeting was limited primarily to EPA staff, with representation from all ten regions, all 5 ORD National Labs and Centers, and all the relevant components of the Office of Water. When dealing with topics where external views were considered critical, outside speakers were invited. Breakout sessions, and a panel discussion, were held with the express purpose of generating detailed lists of the type of data, procedures, and information needed to help with the regulation and control of different types of pathogens, in both drinking and recreational water.