Treated sewage sludge used as fertilizer faces scrutiny due to potential "forever chemicals" contamination.

Sewage sludge, or biosolids, are treated wastewater byproducts used as fertilizers in farming, rich in nutrients like nitrogen and phosphorus. The process removes debris, separates solids, and uses microbes to break down organic matter, followed by heating to kill pathogens. However, biosolids may contain PFAS, "forever chemicals" posing health risks, leading to growing opposition and regulatory scrutiny.