Abstract
Under the Clean Water Act, the US Environmental Protection Agency (EPA) collects information from states on intended use and impairment of each water body. We explore the feasibility of using these data, collected for regulatory purposes, for public health analyses. Combining EPA impairment data and stream hydrology information we estimated the percent of stream length impaired for any use, recreational use, or drinking water use per county in the US as exposure variables. For health outcomes we abstracted county-level hospitalization rates of gastrointestinal infections, GI (ICD-9CM 001-009 excluding 008.45) and gastrointestinal symptoms, GS (ICD-9CM 558.9, 787) among US adults aged 65 years and older from the Center for Medicare and Medicaid Services (1991–2004). Linear mixed-effects models were used to assess county-level associations between percent impaired waters and hospitalization rates adjusted for population density, a proxy for person-to-person transmission. Contrary to expectation, both GI and GS were negatively associated with any water impairment in adjusted models (GI: −0.052, 95 % CI: −0.077, −0.028; GS: −0.438, 95 % CI: −0.702, −0.174). GI was also negatively associated with recreational water impairment (−0.079, 95 % CI: −0.123, −0.036 after adjustment). Neither outcome was associated with drinking water impairment. Limited state data were reported to the EPA for specific recreational (27 states) and drinking (13 states) water impairment, thus limiting the power of the study. Though limited, this analysis demonstrates the feasibility of utilizing regulatory data for public health analyses.
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Acknowledgements
The Office of Research and Development (ORD), US Environmental Protection Agency (EPA), partially funded the research with Innovate!, Inc. and L.C. Messer (Contracts WCF DP26H0001 and EP09D000003) and under EPA Cooperative Agreement with the University of North Carolina at Chapel Hill (CR83323601) and an appointment to the Research Participation Program for the US Environmental Protection Agency, Office of Research and Development, administered by the Oak Ridge Institute for Science and Education through an interagency agreement between the US Department of Energy and EPA. The authors would also like to thank Joel Hansel, EPA Region 4, and Andrey Egorov, World Health Organization, for their help in the initial phases of this project.
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The views expressed in this article are those of the authors and do not necessarily reflect the views or policies of the US Environmental Protection Agency. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
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Jagai, J.S., Rosenbaum, B.J., Pierson, S.M. et al. Putting Regulatory Data to Work at the Service of Public Health: Utilizing Data Collected Under the Clean Water Act. Water Qual Expo Health 5, 117–125 (2013). https://doi.org/10.1007/s12403-013-0095-1
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DOI: https://doi.org/10.1007/s12403-013-0095-1