This fact sheet is one in a series of summaries about hazardous substances and their health effects. This information is important because this substance may harm you. The effects of exposure to any hazardous substance depend on the dose, the duration, how you are exposed, personal traits and habits, and whether other chemicals are present. The general population is probably not exposed to methyl parathion. However, exposure to methyl parathion may occur at farms where it has been sprayed.
Methyl parathion is a powerful poison that affects the central nervous system.
This chemical has been found in at least 16 of 1,416 National Priorities List sites identified by the Environmental Protection Agency. Methyl parathion is an insecticide that comes in two forms, white crystals or a brownish liquid. It smells like rotten eggs and is similar to nerve gas. It has been made in the United States since 1952. Methyl parathion is used to kill insects on farm crops, especially cotton.