Semi annual manure application traning Posted By: Ben Butler August 26, 2009 @ 5:13 am Today's Local News Tweet Share Email The Washington County Extension Office is reminding confinement operators and commercial manure applicators that they are required to undergo regular training. Iowa law mandates two hours of continuing education annually, and or take and pass an exam once every three years. The continuing education and the test are available at local DNR offices. For more information contact the Washington County Extension.