Iowa Code § 443.22: Uniform assessments mandatory.

All assessors and assessing bodies, including the department of revenue having authority over the assessment of property for tax purposes, shall comply with sections 428.4, 428.29, 434.15, 438.13, 441.21, and 441.45. The department of revenue having authority over the assessments, shall exercise its powers and perform its duties under section 421.17 and other applicable laws so as to require the uniform and consistent application of said section.