Not the most detailed list of the Inspection & Testing Services in Iowa. The following list will however point you in the right direction. I do not guarantee that all numbers will work. I would recommend using Google as a great tool to find out more precise information on the Contractors listed below. Another important tidbit, not all companies listed below are Oil & Gas Contractors.
*** As of right now I do not have any to add. Will add them as I find them. ***