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Posted on: March 25, 2022

New IDEM Land Disturbance Requirements for Single Family Residences

The new Construction Stormwater General Permit (CSGP) has many new requirements that will affect the current process of permit compliance. Please review the information below and visit IDEM's website for further information on the new requirements. 

We would like to notify you all on this change to the state's requirements on site plans for single family residences that are not part of a larger plan of development. The new Construction Stormwater General Permit (CSGP) document is available for viewing and downloading here:

The CSGP states the following requirements: 

  • "3.9: Single Family Residences and Ponds that are not Part of a Larger Common Plan of Development or Sale must: (a) Obtain permit coverage in accordance with Section 2.0; (b) Comply with this permit and the general performance standards in this Section with the exception of 3.2(a)(9), 3.6, and 3.8" (page 21)
  • Appendix A: "A single-family residential lot (not part of a multi-lot project) must obtain permit coverage if the projected land disturbance is one (1.0) acre of more." (page 41)

What does this mean? It means that if the proposed land disturbance on a single-family residential lot is more than one (1.0) acre, a Construction Stormwater General Permit, previously known as Rule 5, is required. 

To comply with this new requirement, Porter County Department of Development and Storm Water Management will be requiring that every site plan. all permit types, must include a note state the total area of proposed land disturbance. We will confirm that disturbance is under one (1.0) acre before continuing with the review process.

Please feel free to reach out to the Department with questions. Also please share this information with anyone who would find this notice helpful. As this is a state requirement, questions should also be submitted to IDEM Office of Water Quality

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