However, use of any home chemical in contradiction to label recommendations can lead to pollution of area streams. Pesticides present in streams, even at very low concentrations, can make the water unfit for human consumption or render it toxic to aquatic organisms. In agricultural and urban areas, the highest concentrations of pesticides found in streams occur in storm runoff after the principle application periods. During storms, pesticides are washed off land surfaces and transported to streams. The problem of water contamination from these compounds is becoming increasingly serious in residential areas.
Studies show that homeowners commonly use up to ten times as much pesticides per acre as farmers.
If chemical pesticides alone are to be used, or as part of an Integrated Pest Management program, certain guidelines should be followed to ensure safety and lessen the risk of contaminating surface and ground water. Always keep pesticides in their original containers, and follow all manufacturer directions, restrictions and precautions. Store pesticides in a waterproof location that is secure, preferably locked, well ventilated and out of reach of children and pets. Apply only the amount of pesticide specified on the label, at the correct intervals, and only to the appropriate plants and areas indicated to avoid illegal residues or injury to plants and animals. Dispose of surplus pesticides and containers in accordance with label instruction.