In Iowa, confinement site manure applicators — people who haul and land apply manure from a confinement (totally roofed) facility with a capacity of 500 or more animal units (1,250 finishing hogs, 500 beef cattle, etc.) — must be certified or use a certified commercial manure applicator. Commercial applicators (those who are in the business of hauling or applying manure) must also be properly certified.