Description:
The original EPA recreational water health studies, initiated in 1972 and completed in 1982, were designed to determine the relationship between swimming-associated gastroenteritis and the quality of the bathing water. The water quality was measured using multiple microbial indicators of fecal contamination, including bacteria known to be associated with feces, the skin's surface, and nutrient pollution. Health endpoints were measured as self-reported symptoms or illness from both swimmers (defined as bathers who submersed their head beneath the water surface) and non-swimming controls. Health data were collected on weekends to maximize the swimmer population available, and the swimming-associated gastrointestinal rates for marine and fresh water were calculated by subtracting the illness rate in non-swimmers from the illness rate in swimmers for each type of water. Regression analysis was used to determine the "best" correlations between the microbial indicators and the health data (i.e., those linear relationships where gastrointestinal symptoms or illness rates increased as the water quality indicator densities increased). The data showed that enterococci were correlated with illness rates in both marine and fresh water, while Escherichia coli were correlated in fresh water only, and fecal coliforms showed no correlation with illness rates at all. The mathematical expression of the relationship of unfavorable health effects among swimmers to the quality of water was utilized by the USEPA Office of Water to develop water quality risk limits or guidelines, which were later used by the States to develop water quality standards. However, these health studies used the old water monitoring protocol, based on the geometric mean of five samples per month, and methods which required at least 24 hours for results to become available. If the water was not in compliance with the standard, the risk of exposure to enteric pathogens had potentially occurred long before the quality of the water was identified as being hazardous.
More recent legislation and Agency action plans, including the Clean Water Action Plan, the Beach Action Plan, and the Beach Act of 2000, have identified new requirements to protect recreational waters and people's health. To meet these requirements, a new exposure-health study, conducted jointly by NERL and NHEERL, is being conducted to obtain the relationships between exposures and health impact that are needed for the Office of Water to formulate new health and risk guidelines for recreational water. This task describes NERL's contribution to the exposure component of the joint research effort -- using the new monitoring protocol developed in the EMPACT study and several newly developed rapid methods or those that are currently under evaluation and/or validation. Use of the new health guidelines will allow beach managers and public health officials to alert the public about the potential health hazards before exposure to unsafe water can occur.
Keywords:
RECREATIONAL WATER, EPIDEMIOLOGICAL STUDIES, BATHING BEACHES,
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Project Information:
Progress
:The EPA Regions were contacted for suggestions of beaches that met specific criteria for use in a pilot study and later a full-scale epidemiological health study. Beach personnel and managers were asked to provide information about the recommended beaches, such as point sources, contact information, number of days in and dates of the bathing season, approximate bather load, and several years of past data for evaluation of the beaches. The beach personnel and managers sent in the requested data for use in selection of the beaches for the pilot study.
A screening measurement study of nine beaches (some fresh water and some estuarine or marine) took place during August, 2002, under a contract with Lockheed-Martin. The final report, received in September, 2002, contained the water quality data from the nine beach sites, beach photographs, and maps of the beaches showing the sampling sites. The data were used to select two beach sites for the full-scale epidemiological study for the summer of 2003 and will be used to select the beach sites for the next two summers.
A pilot epidemiological study was conducted jointly by EPA and USGS in late summer, 2002. The exposure measurements compared the current recreational water membrane filter method with a new rapid Polymerase Chain Reaction (PCR) method developed by NERL. NHEERL concurrently collected health data in order to test their questionnaire for the full-scale epidemiological study, which was planned to begin in the summer of 2003. The data from this pilot study are being tabulated and analyzed. A statement of work for the full epidemiological study comparing the standard USEPA Enterococci method with two rapid methods (PCR and RAPTOR), was developed, and water quality and health data were collected at two Great Lakes (fresh water) beaches (West Beach at Indiana Dunes National Lakeshore, Porter, Indiana, and Huntington Beach in Bay Village, Ohio) during the summer of 2003 under a contract with Westat. Data were collected at two additional Great Lakes beaches, Washington Park Beach, Michigan City, Indiana and Silver Beach, St. Joseph, Michigan, in the summer of 2004. Data collection will begin at marine and/or estuarine beaches in 2005.
Relevance
:Development of new risk information for recreational water is a high priority research area for the Agency that will meet the needs stated in GPRA (Goal 2, Objective 2.3, Subobjective 2.3.2), the Clean Water Action Plan, the Beach Action Plan, and the Beach Act of 2000. Beach managers and public health officials will be able to use this information to alert the public about potential health hazards before exposure to unsafe water can occur.
Clients
:Office of Water/Office of Science and Technology
Project IDs:
ID Code
:9656
Project type
:OMIS