Tammy Zimmerman
I currently serve as Chief, New Cumberland Hydrologic Studies, Pennsylvania Water Science Center. In 2023, I also served as Acting Chesapeake Bay Associate Coordinator.
Recent projects address bacteriological issues in Lake Erie on and near the beaches at Presque Isle, as part of the Great Lakes Restoration Initiative, and pesticide issues in vulnerable aquifers in cooperation with the Pennsylvania Department of Agriculture.
Professional Experience
I have worked with the USGS since 1991 and have led a variety of projects with an emphasis on groundwater and surface water hydrology, water quality, microbiology, and statistics.
I started in 1991 as a Student Trainee in Altamonte Springs, Florida and later transferred to Pennsylvania where I was converted to a Hydrologist in 1995 upon completion of my bachelor’s degree.
Education and Certifications
B.S. Civil Engineering, Pennsylvania State University, 1994
Science and Products
Drought-sensitive aquifer settings in southeastern Pennsylvania
Microbiological quality of water from noncommunity supply wells in carbonate and crystalline aquifers of Pennsylvania
Summary of and factors affecting pesticide concentrations in streams and shallow wells of the lower Susquehanna River basin, Pennsylvania and Maryland, 1993-95
Relation between selected well-construction characteristics and occurrence of bacteria in private household-supply wells, south-central and southeastern Pennsylvania
Hydrogeologic framework and sampling design for an assessment of agricultural pesticides in ground water in Pennsylvania
Bacteriological quality of ground water used for household supply, Lower Susquehanna River basin, Pennsylvania and Maryland
Science and Products
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Filter Total Items: 18
Drought-sensitive aquifer settings in southeastern Pennsylvania
This report describes the results of a study conducted by the U.S. Geological Survey, in cooperation with the Pennsylvania Department of Conservation and Natural Resources, Bureau of Topographic and Geologic Survey, to determine drought-sensitive aquifer settings in southeastern Pennsylvania. Because all or parts of southeastern Pennsylvania have been in drought-warning or drought-emergency statusAuthorsTammy M. Zimmerman, Dennis W. RisserMicrobiological quality of water from noncommunity supply wells in carbonate and crystalline aquifers of Pennsylvania
Samples were collected from 59 noncommunity water supplies in the Commonwealth of Pennsylvania from September 2000 to January 2001 and analyzed for pathogens and microbiological indicator organisms. The pathogens sampled were culturable viruses and Helicobacter pylori (H. pylori). The indicator organisms sampled were total coliform, Escherichia coli (E. coli), Clostridium perfringens (C. perfringeAuthorsBruce D. Lindsey, Jennifer S. Rasberry, Tammy M. ZimmermanSummary of and factors affecting pesticide concentrations in streams and shallow wells of the lower Susquehanna River basin, Pennsylvania and Maryland, 1993-95
This report presents the detection frequency of 83 analyzed pesticides, describes the concentrations of those pesticides measured in water from streams and shallow wells, and presents conceptual models of the major factors affecting seasonal and areal patterns of pesticide concentrations in water from streams and shallow wells in the Lower Susquehanna River Basin. Seasonal and areal patterns of peAuthorsRobert A. Hainly, Tammy M. Zimmerman, Connie A. Loper, Bruce D. LindseyRelation between selected well-construction characteristics and occurrence of bacteria in private household-supply wells, south-central and southeastern Pennsylvania
Total coliform and Escherichia coli (E. coli) bacteria were analyzed in ground water sampled from 78 private household-supply wells as part of a study by the U.S. Geological Survey in cooperation with the Pennsylvania Department of Environmental Protection to evaluate the relation between well construction characteristics and the occurrence of bacteria in ground water. Sampling was done in eight cAuthorsTammy M. Zimmerman, Michele L. Zimmerman, Bruce D. LindseyHydrogeologic framework and sampling design for an assessment of agricultural pesticides in ground water in Pennsylvania
State agencies responsible for regulating pesticides are required by the U.S. Environmental Protection Agency to develop state management plans for specific pesticides. A key part of these management plans includes assessing the potential for contamination of ground water by pesticides throughout the state. As an example of how a statewide assessment could be implemented, a plan is presented for tAuthorsBruce D. Lindsey, Tammy M. BickfordBacteriological quality of ground water used for household supply, Lower Susquehanna River basin, Pennsylvania and Maryland
This report describes the bacteriological results of a ground-water study conducted from 1993 to 1995 as part of the U.S. Geological Survey's National Water-Quality Assessment Program in the Lower Susquehanna River Basin study unit. Water samples collected from 146 household supply wells were analyzed for fecal-indicator organisms including total coliform, fecal coliform, Escherichia coli (E. coliAuthorsTammy M. Bickford, Bruce D. Lindsey, M.R. Beaver - Science
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