Oxamyl is a pesticide used on fruits and vegetables that can seep into groundwater. It's highly toxic and can cause nervous system problems if ingested in large amounts.

Oxamyl is a carbamate pesticide introduced in the 1970s for use on various crops. It can enter drinking water sources through agricultural runoff and leaching into groundwater. The EPA measures oxamyl in parts per billion (ppb) and has established a Maximum Contaminant Level to protect public health. While oxamyl breaks down relatively quickly in the environment, its presence in water supplies is monitored due to its potential toxicity at high concentrations.