With any pesticide or chemical application, caution must be exercised in accordance with the manufacturer's suggestions to ensure safety. St. Charles County employs public pesticide applicators that are certified by the Missouri Department of Agriculture. The chemicals we apply are carefully diluted, and our machines are calibrated daily to ensure the most effective distribution of pesticide during our control efforts. When truck drivers pass outdoor residents, they turn off the spray apparatus. While the generator may still be running, the sprayer does not disperse chemicals near people.