woman holding her nose closed due to bad oder

Your Question Answered

Why do I sometimes smell a strong odor after the District has treated the canal with herbicide?

The strong odor you smell is related to the oil emulsion that is mixed with the herbicide. Emulsion herbicides are a thicker consistency, allowing the spray to adhere to treated vegetation even when it rains so that it stays in place long enough to be effective. The odor will dissipate within a few days. The District strictly adheres to the environmental rules and regulations established and enforced by the U.S. Environmental Protection Agency (EPA) and the Florida Department of Environmental Protection (FDEP) for the application of various herbicides associated with aquatic vegetation management.