Which of the following is a potential consequence of improper pesticide disposal?

The potential consequence of improper pesticide disposal is the contamination of the water supply. When pesticides are disposed of incorrectly—such as pouring them down drains, dumping them in landfills, or spilling them on land—they can leach into groundwater or run off into surface water bodies like rivers, lakes, and streams. This contamination can pose serious risks to both human health and aquatic ecosystems. Chemicals can alter water quality, harm aquatic life, and potentially enter drinking water sources. Safe and responsible disposal methods are essential to prevent these harmful outcomes and protect the environment.

In contrast, the other options do not align with the consequences of improper pesticide disposal. Improved soil quality, increased biodiversity, and promotion of healthy ecosystems are all outcomes linked to responsible environmental practices, but they are contrary to what occurs when pesticides are not disposed of properly.