Analysis raises concerns about potential misuse of atrazine weedkiller in US Midwest
By Douglas Main
Corn growers across Midwestern states appear to be flouting regulations aimed at protecting important waterways from contamination with toxic atrazine weedkiller, according to an analysis of satellite imagery and field data that comes as US regulators ponder changes to rules for use of the pesticide.
The analysis, which was conducted by an agricultural industry consultant in Illinois and shared with The New Lede, found what could potentially be thousands of violations by farmers in Illinois and neighboring states. The analysis honed in on geographic points where farm fields planted by corn growers are seen closely abutting waterways, and assumes that farmers sprayed their crops with atrazine, a common practice in the US Midwest.
Though it could not be determined if atrazine was used on the fields, the chemical is applied to the majority of corn acres in the state, and the satellite images show clear pathways for the flow of farm chemicals off the fields and into waters. Critics say the information exposes critical problems with current regulation of atrazine, which is known to pose an array of health risks to humans and animals and is considered a dangerous water contaminant.
The images and supporting data from the analysis were submitted this week to the US Environmental Protection Agency (EPA) by the Center for Biological Diversity (CBD), which also obtained the information from the consultant, who wishes to remain anonymous.
Though the analysis identified areas of concern in multiple states, it focuses on Illinois, the nation’s No. 2 corn-producing state. In just three counties of Illinois, and along key lakes that provide drinking water for the state, the analysis shows nearly 1,000 parcels of land where farmers planted corn and soybeans right up against rivers and streams and lakes, within required buffer zones where spraying atrazine is not allowed. (Farmers in the Midwest typically rotate planting corn and soy.)
A satellite image shows surface runoff from an Illinois farm field channeling into gullies and flowing into a stream, one of the areas where it would be improper to spray atrazine.
Overall, there were more than 1,420 individual sites on the parcels of land where cropped area was less than the required 66 feet from the nexus where runoff enters streams or rivers, according to the analysis. There were more than 100 parcels with crops planted closer than the 200-foot margin required as a no-spray zone along the edges of drinking water lakes and reservoirs. These buffer zones, or setbacks, are spelled out on atrazine’s label.