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Designated MS4 Entities Currently Permitted

IDEM maintains a list of all MS4 entities permitted under Municipal Separate Storm Sewer System General Permit (MS4GP). This list provides the permit number assigned to the MS4, the entity responsible for the local program, and contact information.

If additional information is required or there is a concern about a specific local program, IDEM encourages the individual to contact the MS4 Operator directly.

The MS4GP applies to an MS4 entity that meets the following requirements:

  • Is not required to obtain an individual NPDES permit under 327 IAC 5-4-6(a)(4), 327 IAC 5-4-6(a)(5) or 327 IAC 15-2-9(b);
  • Meets the general permit rule applicability requirements under 327 IAC 15-2-3;
  • Does not have coverage under an individual MS4 permit; and
  • Operates, maintains, or otherwise has responsibility for an MS4 conveyance within a designated MS4 area.

A Listing of MS4s currently permitted under the MS4GP can be obtained at Designated MS4 Entities Currently Permitted [XLS].

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