Paraquat is a highly toxic herbicide used in agriculture. It can contaminate water through runoff. Ingestion causes severe lung damage and is linked to Parkinson's disease.

Paraquat, introduced in the 1960s, remains a widely used herbicide in the US despite bans in many countries due to its toxicity. It's prized for its rapid, non-selective weed control but accumulates in soil and can contaminate water sources. Strict regulations govern its use, requiring certified applicators. There's no effective treatment for paraquat poisoning, which can cause irreversible lung damage. Its continued use remains controversial due to potential links to Parkinson's disease and other health concerns.