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90th General Assembly · Funnel one-pager · Monday, November 9, 2026

SF 455: Relating to the regulation of topsoil and storm water at construction sites

Signed into law

What it does

This bill relates to the regulation of topsoil and storm water at construction sites. The bill prohibits a county or city from adopting or enforcing an ordinance, motion, resolution, or amendment relating to the preservation, compaction, placement, or depth of topsoil at a construction site. The bill authorizes a county or city to adopt or enforce an ordinance, motion, resolution, or amendment that regulates storm water runoff at a construction site only to the extent that such regulation does not require a post-construction storm water flow rate that is more restrictive than the existing flow rate of the same storm event, with all such runoff rates based on the actual existing condition of the site at the time the construction commences.

Sponsors

Local Government committee

Cost

Can’t be estimated

The fiscal impact of the Bill to counties and cities cannot be estimated as it is unknown how many studies would be needed and it is unknown how many counties or cities would create more restrictive storm water requirements. 0 new FTE positions for inspectors …

House subcommittee · named January 10, 2024

  • Rep. Jon Dunwell (R)
  • Rep. Jerome Amos Jr. (D) · jerome.amosjr@legis.iowa.gov
  • Rep. Luana Stoltenberg (R)

Lobbying · 4 for, 21 against

For: Americans For Prosperity; Home Builders Association of Iowa; Iowa Manufactured Housing Association; Iowa Real Estate Developers Association

Against: American Council of Engineering Companies; American Planning Association Iowa Chapter; American Society of Civil Engineers Iowa Section; Center for Rural Affairs; City of Des Moines; City of Waukee; City of West Des Moines; Conservation Districts of Iowa; County Planning and Zoning Officials of Iowa; Iowa Association of Building Officials; Iowa Association of Water Agencies; Iowa Chapter, American Institute of Architects; and 9 more

In plain words

  1. February 28, 2023Filed in the Senate
  2. February 28, 2023Approved by the Senate committee
  3. March 15, 2023Passed the Senate, 33–15
  4. March 15, 2023Arrived in the House
  5. March 21, 2023House subcommittee named: Stoltenberg, Deyoe and Staed
  6. March 27, 2023Subcommittee recommended passing it
  7. March 29, 2023Approved by the House committee
  8. January 10, 2024House subcommittee named: Dunwell, Amos Jr. and Stoltenberg
  9. January 17, 2024Subcommittee recommended passing it
  10. February 6, 2024Approved by the House committee
  11. March 6, 2024Failed in the House, 44–49
  12. March 11, 2024Passed the House, 53–46
  13. March 13, 2024Cost estimate (fiscal note) posted
  14. March 25, 2024Passed the Senate, 29–18
  15. April 10, 2024Sent to the Governor
  16. April 10, 2024Signed into law
  17. April 29, 2024Cost estimate (fiscal note) posted

From public records at legis.iowa.gov, compiled by Funnel (iowafunnel.com), an independent, nonpartisan site. Current as of Monday, November 9, 2026. https://iowafunnel.com/bills/90/SF455