Megan Shoda
Megan Shoda is a Hydrologist with the Water Mission Area Earth System Processes Division.
Meg's research interests include understanding how water quality affects water supply, enhancing the efficiency and productivity of working with large datasets, and creating communication products that deliver the expertise of the USGS in an accessible way.
Professional Experience
May 2022 to present: Hydrologist, Earth System Processes Division
May 2014 to April 2022: Hydrologist, Ohio-Kentucky-Indiana Water Science Center, Indianapolis, IN
May 2010 to April 2014: Biologist, Ohio-Kentucky-Indiana Water Science Center, Indianapolis, IN
Education and Certifications
M.S., Biology, University of Dayton
Science and Products
Glyphosate and aminomethylphosphonic acid (AMPA) in National Water Quality Network Streams and Rivers in the U.S., Water Years 2015-2017 Glyphosate and aminomethylphosphonic acid (AMPA) in National Water Quality Network Streams and Rivers in the U.S., Water Years 2015-2017
The U.S. Geological Survey (USGS) National Water Quality Network - Rivers and Streams (NWQN) is comprised of 110 surface-water monitoring sites designed to track ambient water-quality conditions across the nation. Although numerous constituents, including pesticides, have been collected at many of these sites since 1991, glyphosate and its metabolite aminomethylphosphonic acid (AMPA)...
Multi-source surface-water-quality data and U.S. Geological Survey streamgage match for the Delaware River Basin Multi-source surface-water-quality data and U.S. Geological Survey streamgage match for the Delaware River Basin
Jointly managed by multiple states and the federal government, there are many ongoing efforts to characterize and understand water quality in the Delaware River Basin (DRB). Many State, Federal and non-profit organizations have collected surface-water-quality samples across the DRB for decades and many of these data are available through the National Water Quality Monitoring Council's...
Replicate surface water and groundwater data analyzed by USGS National Water Quality Laboratory schedule 2437, 2013-15 Replicate surface water and groundwater data analyzed by USGS National Water Quality Laboratory schedule 2437, 2013-15
Replicate water-quality samples are collected and prepared in the field and analyzed in the laboratory in identical ways so that they are considered to be the same in composition and analysis (Mueller and others, 2015). This data set includes one table of duplicate National Water-Quality Assessment Project (NAWQA) surface water and groundwater samples collected between October 1, 2012...
Filter Total Items: 18
Pesticides in US Rivers: Regional differences in use, occurrence, and environmental toxicity, 2013 to 2017 Pesticides in US Rivers: Regional differences in use, occurrence, and environmental toxicity, 2013 to 2017
Pesticides pose a threat to the environment, but because of the substantial number of compounds, a comprehensive assessment of pesticides and an evaluation of the risk that they pose to human and aquatic life is challenging. In this study, improved analytical methods were used to quantify 221 pesticide concentrations in surface waters over the time period from 2013 to 2017. Samples were...
Authors
Sarah M. Stackpoole, Megan E. Shoda, Laura Medalie, Wesley W. Stone
Pesticide mixtures show potential toxicity to aquatic life in U.S. streams, water years 2013-2017 Pesticide mixtures show potential toxicity to aquatic life in U.S. streams, water years 2013-2017
During water years (WY) 2013–2017, the U.S. Geological Survey, National Water-Quality Assessment (NAWQA) Project, sampled the National Water Quality Network – Rivers and Streams (NWQN) year-round and reported on 221 pesticides at 72 sites across the United States in agricultural, developed, and mixed land use watersheds. The Pesticide Toxicity Index (PTI) was used to estimate the...
Authors
S. Alex Covert, Megan E. Shoda, Sarah M. Stackpoole, Wesley W. Stone
A historical look at changing water quality in the Delaware River basin A historical look at changing water quality in the Delaware River basin
In 2019 the U.S. Geological Survey (USGS) launched a pilot regional Integrated Water Availability Assessment (IWAA) in the Delaware River Basin (fig. 1). IWAA is intended to explore, test, and refine systems and processes for assessing water availability for human and ecological uses and understanding their underlying controls. Water quality plays an important role in supporting...
Authors
Jennifer C. Murphy, Megan E. Shoda
Pooling resources across organizations — Multisource water-quality data for the Delaware River Basin Pooling resources across organizations — Multisource water-quality data for the Delaware River Basin
The U.S. Geological Survey (USGS) recently launched a pilot Integrated Water Availability Assessment (IWAA) in the Delaware River Basin to explore, test, and refine systems and processes for assessing water availability for human and ecological uses based on water monitoring data. Water-quality monitoring provides citizens, managers, and scientists with the information needed to evaluate...
Authors
Jennifer C. Murphy, Megan E. Shoda
Influence of land use and region on glyphosate and aminomethylphosphonic acid in streams in the USA Influence of land use and region on glyphosate and aminomethylphosphonic acid in streams in the USA
Glyphosate is the most widely used herbicide in the United States for agricultural and non-agricultural weed control. Many studies demonstrate possible effects of glyphosate and its degradate AMPA on human and ecological health. Although glyphosate is thought to have limited mobility in soil, it is found year-round in many rivers and streams throughout the world in both agricultural and...
Authors
Laura Medalie, Nancy T. Baker, Megan E. Shoda, Wesley W. Stone, Michael T. Meyer, Edward G. Stets, Michaelah C. Wilson
Water-quality trends in U.S. rivers, 2002 to 2012: Relations to levels of concern Water-quality trends in U.S. rivers, 2002 to 2012: Relations to levels of concern
Effective management and protection of water resources relies upon understanding how water-quality conditions are changing over time. Water-quality trends for ammonia, chloride, nitrate, sulfate, total dissolved solids (TDS), total nitrogen (TN) and total phosphorus (TP) were assessed at 762 sites located in the conterminous United States between 2002 and 2012. Annual mean concentrations...
Authors
Megan E. Shoda, Lori A. Sprague, Jennifer C. Murphy, Melissa L. Riskin
Science and Products
Glyphosate and aminomethylphosphonic acid (AMPA) in National Water Quality Network Streams and Rivers in the U.S., Water Years 2015-2017 Glyphosate and aminomethylphosphonic acid (AMPA) in National Water Quality Network Streams and Rivers in the U.S., Water Years 2015-2017
The U.S. Geological Survey (USGS) National Water Quality Network - Rivers and Streams (NWQN) is comprised of 110 surface-water monitoring sites designed to track ambient water-quality conditions across the nation. Although numerous constituents, including pesticides, have been collected at many of these sites since 1991, glyphosate and its metabolite aminomethylphosphonic acid (AMPA)...
Multi-source surface-water-quality data and U.S. Geological Survey streamgage match for the Delaware River Basin Multi-source surface-water-quality data and U.S. Geological Survey streamgage match for the Delaware River Basin
Jointly managed by multiple states and the federal government, there are many ongoing efforts to characterize and understand water quality in the Delaware River Basin (DRB). Many State, Federal and non-profit organizations have collected surface-water-quality samples across the DRB for decades and many of these data are available through the National Water Quality Monitoring Council's...
Replicate surface water and groundwater data analyzed by USGS National Water Quality Laboratory schedule 2437, 2013-15 Replicate surface water and groundwater data analyzed by USGS National Water Quality Laboratory schedule 2437, 2013-15
Replicate water-quality samples are collected and prepared in the field and analyzed in the laboratory in identical ways so that they are considered to be the same in composition and analysis (Mueller and others, 2015). This data set includes one table of duplicate National Water-Quality Assessment Project (NAWQA) surface water and groundwater samples collected between October 1, 2012...
Filter Total Items: 18
Pesticides in US Rivers: Regional differences in use, occurrence, and environmental toxicity, 2013 to 2017 Pesticides in US Rivers: Regional differences in use, occurrence, and environmental toxicity, 2013 to 2017
Pesticides pose a threat to the environment, but because of the substantial number of compounds, a comprehensive assessment of pesticides and an evaluation of the risk that they pose to human and aquatic life is challenging. In this study, improved analytical methods were used to quantify 221 pesticide concentrations in surface waters over the time period from 2013 to 2017. Samples were...
Authors
Sarah M. Stackpoole, Megan E. Shoda, Laura Medalie, Wesley W. Stone
Pesticide mixtures show potential toxicity to aquatic life in U.S. streams, water years 2013-2017 Pesticide mixtures show potential toxicity to aquatic life in U.S. streams, water years 2013-2017
During water years (WY) 2013–2017, the U.S. Geological Survey, National Water-Quality Assessment (NAWQA) Project, sampled the National Water Quality Network – Rivers and Streams (NWQN) year-round and reported on 221 pesticides at 72 sites across the United States in agricultural, developed, and mixed land use watersheds. The Pesticide Toxicity Index (PTI) was used to estimate the...
Authors
S. Alex Covert, Megan E. Shoda, Sarah M. Stackpoole, Wesley W. Stone
A historical look at changing water quality in the Delaware River basin A historical look at changing water quality in the Delaware River basin
In 2019 the U.S. Geological Survey (USGS) launched a pilot regional Integrated Water Availability Assessment (IWAA) in the Delaware River Basin (fig. 1). IWAA is intended to explore, test, and refine systems and processes for assessing water availability for human and ecological uses and understanding their underlying controls. Water quality plays an important role in supporting...
Authors
Jennifer C. Murphy, Megan E. Shoda
Pooling resources across organizations — Multisource water-quality data for the Delaware River Basin Pooling resources across organizations — Multisource water-quality data for the Delaware River Basin
The U.S. Geological Survey (USGS) recently launched a pilot Integrated Water Availability Assessment (IWAA) in the Delaware River Basin to explore, test, and refine systems and processes for assessing water availability for human and ecological uses based on water monitoring data. Water-quality monitoring provides citizens, managers, and scientists with the information needed to evaluate...
Authors
Jennifer C. Murphy, Megan E. Shoda
Influence of land use and region on glyphosate and aminomethylphosphonic acid in streams in the USA Influence of land use and region on glyphosate and aminomethylphosphonic acid in streams in the USA
Glyphosate is the most widely used herbicide in the United States for agricultural and non-agricultural weed control. Many studies demonstrate possible effects of glyphosate and its degradate AMPA on human and ecological health. Although glyphosate is thought to have limited mobility in soil, it is found year-round in many rivers and streams throughout the world in both agricultural and...
Authors
Laura Medalie, Nancy T. Baker, Megan E. Shoda, Wesley W. Stone, Michael T. Meyer, Edward G. Stets, Michaelah C. Wilson
Water-quality trends in U.S. rivers, 2002 to 2012: Relations to levels of concern Water-quality trends in U.S. rivers, 2002 to 2012: Relations to levels of concern
Effective management and protection of water resources relies upon understanding how water-quality conditions are changing over time. Water-quality trends for ammonia, chloride, nitrate, sulfate, total dissolved solids (TDS), total nitrogen (TN) and total phosphorus (TP) were assessed at 762 sites located in the conterminous United States between 2002 and 2012. Annual mean concentrations...
Authors
Megan E. Shoda, Lori A. Sprague, Jennifer C. Murphy, Melissa L. Riskin