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This report examines changes in selected pesticides in the Little Arkansas River in south-central Kansas. The work is connected to monitoring of river water used as a source for artificial recharge of the Equus beds aquifer, an important water supply for Wichita.
The analysis brings together continuous streamflow and water-quality measurements with discrete samples for atrazine, glyphosate, and aminomethylphosphonic acid. It considers how concentrations and related measures vary through the available record and how changing river conditions affect their interpretation.
Readers will find a long-term environmental monitoring study supported by methods, graphs, tables, and references. The report explains the aquifer-recharge setting and the purpose of the sampling programme before presenting the trend analysis. Its detailed treatment of the record provides context for understanding source-water conditions over time rather than relying on isolated measurements.
Mandy L. Stone; Brian J. Klager. Long-Term Trends of Selected Pesticides in the Little Arkansas River, South-Central Kansas, 1995–2023. U.S. Geological Survey, 2026. https://doi.org/10.3133/sir20265016. Public domain U.S. Government publication. Original author, agency and photograph credits retained.