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Imagery from GIScience Research Group @ University of Heidelberg | Map data ASTER GDEM, SRTM | Sentinel-2 cloudless - https://s2maps.eu by EOX IT Services GmbH (Contains modified Copernicus Sentinel data 2017 & 2018) | Map tiles by Stamen Design, CC BY 3.0 — Map data © OpenStreetMap contributors

PIC to RTL exceedance probabilities
■ 0 to 10%  ■ 10 to 20%  ■ 20 to 30%  ■ 30 to 40%  ■ 40 to 50%  ■ >50%

This interactive map accompanies the publication “Insecticide Risk in US Surface Waters: Drivers and Spatiotemporal Modeling” published in Environmental Science & Technology. Please refer to the publication via https://pubs.acs.org/doi/10.1021/acs.est.9b04285 for detailed methodological descriptions. Briefly, simulation results, using validated regression models, highlight regions in the United States in which current spatiotemporal factors promote nonpoint source insecticide pollution in nontarget aquatic systems. A risk is indicated if a predicted insecticide concentration (PIC) exceeds their respective regulatory threshold level (RTL), consequently, risks are expressed as PIC to RTL exceedance probabilities.

The user may choose from different scenarios that detail estimated risks in i. small (<100 km²), ii. medium-sized (100 – 1000 km²), iii. large (>1000 km²), and iv. all surface waters. In addition, different years are selectable (1992 – 2017) for which risk scenarios were estimated. Insecticide use estimates are provided by the United States Geological Survey (see Baker).

Additionally, interactive figures detailing impact of various risk drivers, as well as the impact of toxicities in mixtures, can be found here.