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Fecal Impairment Framework, A New Conceptual Framework for Assessing Fecal Contamination in Recreational Waters

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Abstract

Fecal pollution of surface water is a pervasive problem that negatively affects waterbodies concerning both public health and ecological functions. Current assessment methods monitor fecal indicator bacteria (FIB) to identify pollution sources using culture-based quantification and microbial source tracking (MST). These types of information assist stakeholders in identifying likely sources of fecal pollution, prioritizing them for remediation, and choosing appropriate best management practices. While both culture-based quantification and MST are useful, they yield different kinds of information, potentially increasing uncertainty in prioritizing sources for management. This study presents a conceptual framework that takes separate human health risk estimates based on measured MST and E. coli concentrations as inputs and produces an estimate of the overall fecal impairment risk as its output. The proposed framework is intended to serve as a supplemental screening tool for existing monitoring programs to aid in identifying and prioritizing sites for remediation. In this study, we evaluated the framework by applying it to two primarily agricultural watersheds and several freshwater recreational beaches using existing routine monitoring data. Based on a combination of E. coli and MST results, the proposed fecal impairment framework identified four sites in the watersheds as candidates for remediation and identified temporal trends in the beach application. As these case studies demonstrate, the proposed fecal impairment framework is an easy-to-use and cost-effective supplemental screening tool that provides actionable information to managers using existing routine monitoring data, without requiring specialized expertize.

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Acknowledgements

We wish to thank the Macomb County Health Department for sample collection in the beach monitoring case study. We would like to thank Michael Vu, Nicholas Castle, and Josie Kuhlman for conducting initial analysis at Oakland University. We would like to thank Michigan Department of Environment, Great Lakes, and Energy through the 319 Nonpoint Source Grant 2018-0021 and the Beaches and Environmental Assessment and Coastal Health Act Grant Number: 2021-7210; Grand Valley State Universities Presidential Research Grant; and The West Michigan Air & Waste Management Association’s individual scholarship for funding this project. This work was done in partial fulfillment of requirements for a Master of Science in Biology at the Robert B. Annis Water Resources Institute.

Author Contributions:

JJH: Conceptualization, Funding Acquisition, Methodology, Investigation, Formal Analysis, Data Curation, Visualization, Writing - Original Draft, Writing - Review and Editing. MNJ: Methodology, Investigation, Formal Analysis, Data Curation, Writing - Original Draft, Writing - Review and Editing. AMP: Formal Analysis, Visualization, Writing - Review and Editing. JNM: Formal Analysis, Visualization, Writing - Review and Editing. DCS: Funding Acquisition, Writing - Review and Editing. RRR: Funding Acquisition, Methodology, Supervision, Writing - Review and Editing.

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Correspondence to John J. Hart.

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Hart, J.J., Jamison, M.N., Porter, A.M. et al. Fecal Impairment Framework, A New Conceptual Framework for Assessing Fecal Contamination in Recreational Waters. Environmental Management 73, 443–456 (2024). https://doi.org/10.1007/s00267-023-01878-x

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  • DOI: https://doi.org/10.1007/s00267-023-01878-x

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