Waterborne Study
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American Chemical Society (ACS) Fall 2026 Meeting
August 23rd-27th, Chicago IllinoisJoin Waterborne at this year's American Chemical Society (ACS) Fall 2026 Meeting on August 24th in Chicago, Illinois as our Principal, Exposure Modeling and Risk Assessment, Nathan Snyder, along with collaborators from Bayer CropScience, Corteva Agriscience, BASF Agricultural Solutions, and CropLife America, will present:
Evaluating Refined Pesticide Exposure Using EPA's Tier-3 Scenarios: Potential Impact on Mitigation Under ESA
Session: Environmental Fate, Transport, and Modeling of Agriculturally Related Chemicals, Monday, August 24, 2026 from 5:05 PM - 5:30 PM, ChemPod 1 - McCormick Place Convention Center
The presentation examines EPA's Tier-3 Pesticide in Water Calculator (PWC) scenarios as a science-based approach for refining pesticide exposure assessments and supporting Endangered Species Act (ESA) evaluations.
The research explores how Tier-3 refinements account for critical landscape and environmental factors, including soil characteristics, slope, and weather conditions, that influence predicted environmental exposure concentrations in aquatic habitats. By systematically evaluating compounds with varying sorption and degradation properties across multiple crops, the study provides insight into the broader applicability of Tier-3 scenarios within the current regulatory framework.
AUTHORS:Â Nathan J. Snyder, Lula Ghebremichael, Maura Roberts, Cornelis Hoogeweg, Frank Donaldson, Rebecca Haynie
Full Abstract:
This study evaluated EPA’s Tier-3 Pesticide in Water Calculator (PWC) scenarios as a potential science-based approach for refining pesticide exposure estimates and informing, at a detailed spatial scale, potential mitigations in support of the agency’s Endangered Species Act review efforts. By examining test-case pesticides with variable sorption and degradation rates in a systematic fashion across varying crops, we assess how Tier-3 refinements account for key factors such as soil, slope, and weather conditions that influence predicted environmental exposure concentrations (EECs) in simulated edge-of-field aquatic habitats. The standard scenarios assigned by crop/HUC-2 watersheds are placed in the context of the extensive Tier 3 scenario set. The analysis explored the broader applicability of Tier-3 refinements across multiple compounds and their alignment with the current regulatory framework.
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