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Ohio’s construction storm water permitting program is designed to keep pollutants out of waters of the state. During a rain event, uncontrolled construction sites can contribute more sediment to streams than is deposited naturally over several years. Sediment and other pollutants from construction sites can also cause physical, chemical and biological harm to surface waters and aquatic habitat.

On April 23, 2018 Ohio EPA finalized changes to the construction storm water general permit (Permit No. OHC000005). If you intend to seek coverage under the new general permit for your construction activities, it’s important that you are aware of these changes, which include:

  • Permit Area – Incorporates the Big Darby Creek watershed permit and portions of the Olentangy River watershed permit requirements as appendices. This combines all three previous general permits into one.
  • Electronic Submittal of Applications and Storm Water Pollution Prevention Plan (SWP3) – Requires Notice of Intent (NOI), Notice of Termination (NOT), Individual Lot NOI/NOT and Co-Permittee NOI/NOT applications to be submitted electronically using Ohio EPA’s electronic application forms, which are available through Ohio EPA's eBusiness Center at
  • Sediment Basin and Sediment Barriers – Language has been revised to clarify that sediment basins are appropriate for sites less than 10 acres and that all sediment basins have a minimum drain time of 48 hours. The term sediment barrier has replaced the term silt fence in some instances. And it is specified that a standard silt fence may be substituted with a 12-inch diameter sediment barrier.
  • Post-Construction Requirements – Evaluation of previous post-construction requirements found that the application of the previous methodology is not expected to capture average annual runoff and 80 percent total suspended solids (TSS). Changes to post-construction requirements have been made to improve expected performance to this level.
  • Inspections – Allows the next inspection after a rainfall to occur on the next work day and requires that reduced inspection frequency be documented in the SWP3.
  • Big Darby Creek Watershed Appendix – Adds the watershed-specific conditions that exceed the statewide construction general permit for the Big Darby Creek watershed including sediment basin sizing and monitoring requirements, riparian setback/mitigation requirements and ground water recharge/mitigation requirements. An option has been added for calculating a recharge value when using infiltrating green infrastructure practices on-site.
  • Portions of the Olentangy River Watershed Appendix – Adds the watershed-specific conditions that exceed the statewide construction general permit for portions of this watershed, specifically pertaining to riparian setback and mitigation requirements.
  • Definitions – The definition of Operator has been clarified and definitions have been added for General Contractor and Subcontractor.
  • DEFA hosted a webinar explaining these changes on May 16, 2018. The recorded webinar may be accessed through our online training catalog at water. The final general permit and associated documents may be viewed at For more information regarding this general permit, please contact Michael Joseph at (614) 752-0782 or or Jason Fyffe at (614) 728-1793 or