A woman shops in the produce section at Whole Foods in New York City. The company recently announced it would prohibit produce farmed using biosolids in its stores. Stephen Chernin/Getty Images hide caption

itoggle caption Stephen Chernin/Getty Images

Thick jets of processed sewage arc out 30 to 40 feet from giant moving spreaders at Birmingham Farm in Kansas City, Mo. Frank Morris for NPR hide caption

itoggle caption Frank Morris for NPR