Fifteen Inch Rule

While Normal Farming Operations that are routine to most farms do not require prior notice to the Iowa One Call system, all other farming operations which will penetrate the soil more than fifteen inches do require notification to the Iowa One Call System at least 48-hours prior to excavating (excluding weekends and legal holidays).

Examples of operation that are not considered to be normal farming operations are: chisel plowing, sub-soiling, or ripping more than fifteen inches in depth, drain tile excavating, terracing, digging or driving a post in a new location other than replacing a post while repairing a fence in its existing location.