Iowa Admin. Code r. 561-17.7
Every well shall be identified by a sign, posted on the derrick or not more than 20 feet from the wellhead. Such signs shall be durable and legible. The wells on each lease or property shall be numbered in nonrepetitive, logical, and distinctive sequence. Each sign shall show the number of the well, the name of the lease (which shall be different or distinctive for each lease), the name of the lessee, owner or operator, the permit number, and the location by quarter, section, township, and range.
[ARC 9442C, IAB 7/23/25, effective 8/27/25]