Harmful chemicals in sewage sludge spread on pasture as fertilizer pose a risk to people who regularly consume milk, beef and other products from those farms, in some cases raising cancer risk “several orders of magnitude” above what the Environmental Protection Agency considers acceptable, federal officials announced Tuesday. When cities and towns treat sewage, they clean the liquids and separate out the solids, which then need disposal. They make a nutrient-rich sludge that is often spread on farm fields. The agency now says those solids often contain toxic, lasting PFAS and treatment plants can’t effectively remove them.