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New Source Review

New Source Review (NSR) identifies the conditions a regulated source must meet to lawfully construct. NSR is generally required for:

  • A new source proposed on land that was previously undeveloped or at a location that was previously unpermitted (this is referred to as New Source Construction)
  • A substantial physical change or a change in the method of operation proposed at an existing source.

There are three types of NSR permits. Each has a different set of requirements. A source may have to meet one or more of these requirements. IDEM is authorized to issue NSR permits in Indiana. Following are details about each type of NSR permit.

Prevention of Significant Deterioration (PSD) Permit

Nonattainment NSR (Emission Offset (EO)) Permit

Minor NSR Permit

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