Iowa Code § 478.20: Distance from buildings.

No transmission line shall be constructed, except by agreement, within one hundred feet of any dwelling house or other building, except where said line crosses or passes along a public highway or is located alongside or parallel with the right-of-way of any railway company. In addition to the foregoing, each person, company, or corporation shall conform to any other rules, regulations, or specifications established by the utilities commission, in the construction, operation, or maintenance of such lines.