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Air Quality

Regulation and SIP Management

New Source Review (NSR)

New Source Review (NSR) is a preconstruction permitting program that started with the Clean Air Act Amendments of 1977. The goal of NSR is to ensure that new facilities do not significantly degrade existing air quality in areas that attain the National Ambient Air Quality Standards (NAAQS), or prevent areas that are in nonattainment with the NAAQS from slowing progress towards improving their air quality. NSR also ensures that new facilities use the most current emissions control technology. The Environmental Protection Agency (EPA) significantly amended the NSR program in 2002, and DHEC incorporated those changes in 2005. DHEC incorporated further changes in 2009 and 2011, and EPA granted full approval to all three of these NSR revisions in 2011. Please see EPA's NSR webpage for more information.

On June 23, 2011, the Environmental Protection Agency (EPA) approved DHEC's April 14, 2009, and February 25, 2011, amendments to S.C. Regulation 61-62.5, Standard No. 7, Prevention of Significant Deterioration; S.C. Regulation 61-62.5, Standard No. 7.1, Nonattainment New Source Review (NSR); and the State Implementation Plan (SIP) to incorporate provisions of the following federal rules:

  • Prevention of Significant Deterioration (PSD) and Nonattainment New Source Review (NSR): Removal of Vacated Elements)" (72 FR 32526, June 13, 2007) by amending regulations to eliminate pollution control project and clean unit provisions
  • "Prevention of Significant Deterioration, Nonattainment New Source Review, and Title V: Treatment of Certain Ethanol Production Facilities Under the "Major Emitting Facility" Definition" (72 FR 24060, May 1, 2007), commonly called the "Ethanol Rule."

Based on the Ethanol Rule, DHEC excluded ethanol production facilities that produce ethanol by natural fermentation and are included in NAICS codes 325193 or 312140 from the chemical process source category. However, as described in EPA's June 23, 2011, approval, EPA took no action on DHEC's revision to incorporate the Ethanol Rule exemption into S.C. Regulation 61-62.5, Standard No. 7 and 7.1.

DHEC committed to make the regulatory amendments concerning pollution control projects and clean units in a November 20, 2007, commitment letter to EPA. Also, the EPA required these changes in its partial and conditional approval of DHEC's 2005 NSR revisions (73 FR 31368, June 2, 2008).

New Source Review Revision Documents

Federal Register Publications

  • "Approval and Promulgation of Implementation Plans; South Carolina: Prevention of Significant Deterioration and Nonattainment New Source Review; Fine Particulate Matter and Nitrogen Oxides as a Precursor to Ozone" (76 FR 36875, June 23, 2011)
  • "Prevention of Significant Deterioration, Nonattainment New Source Review, and Title V: Treatment of Certain Ethanol Production Facilities Under the "Major Emitting Facility" Definition" (72 FR 24060, May 1, 2007)
  • "Prevention of Significant Deterioration (PSD) and Nonattainment New Source Review (NSR): Removal of Vacated Elements)" (72 FR 32526, June 13, 2007)

If you have any questions, please contact Maeve Mason by phone at (803) 898-2230 or by email


For more information please contact the Bureau of Air Quality at (803) 898-4123 or by email.