Clean Air Act Section 112 Major and Area Source Standards

EPA's final delegation approval of Section 112 NESHAP standards for Indiana constitutes a program of straight delegation of all existing and future air toxic standards regardless of a source's Part 70 (Title V) applicability, with the exception of Section 112(r).

For future 112 NESHAP standards for which IDEM intends to accept delegation, EPA will automatically delegate the authority to implement a standard to the State by letter unless IDEM notifies EPA differently within 45 days of EPA final promulgation of the standard. Upon receipt of the EPA letter, IDEM will be responsible for the implementation of the standard. IDEM will then adopt the standard unchanged from the Federal standard into State regulations as expeditiously as practicable. IDEM will submit proof of rule adoption to EPA. EPA will respond with a letter delegating enforcement authority to the State. EPA will enforce the standard until such time the State has been delegated the enforcement authority.

IDEM has chosen not to take full or partial delegation of newly promulgated area source MACT standards.

• Approval of Section 112(l) Delegation of Maximum Achievable Control Technology Standards; Indiana (71 FR 2225) - Jan. 13, 2006
• EPA Letter to IDEM in response to IDEM letters Feb. 14, 2005 and Sept. 19, 2005 - Nov. 30, 2005
• Approval of Section 112(l) Delegation of Maximum Achievable Control Technology Standards; Indiana (69 FR 22508) - April 26, 2004
• EPA Letter to IDEM in response to June 30, 2003 letter - Dec. 29, 2003
• Approval of Section 112(l) Delegation of Maximum Achievable Control Technology Standards; Indiana (65 FR 17264) - March 31, 2000
• EPA Letter to IDEM in response to Dec. 8, 1999 112(l) delegation request - Jan. 6, 2000

112(L) Delegations to Indiana through a state rule that adjusts the MACT standard

• Approval of Clean Air Act Section 112(l) Delegations for National Emission Standards for Hazardous Air Pollutants Subparts II, CCC, MMMM, PPPP, and DDDDD; Indiana (72 FR 36702) - July 5, 2007
• EPA Letter to IDEM in response to Feb. 8, 2007 letter - May 30, 2007
• Approval of the Clean Air Act Section 112(l) Delegation of National Emission Standards for Hazardous Air Pollutants for Reinforced Plastic Composites Production; Indiana (71 FR 56973) - Sept. 28, 2006 
• Approval of the Clean Air Act Section 112(l) Delegation of National Emission Standards for Hazardous Air Pollutants for Boat Manufacturing; Indiana (71 FR 56971) - Sept. 28, 2006
• Approval of the Clean Air Act Section 112(l) Delegation of National Emission Standards for Hazardous Air Pollutants for Secondary Lead Smelting; Indiana (71 FR 48923) - Aug. 22, 2006

Federal Register Documents for Approval of Section 112(l) Program of Delegation​

• Final Rule: Approval of Section 112(l) Program of Delegation; Indiana (62 FR 36460) - July 8, 1997
• Proposed Rule: Approval of Section 112(l) Program of Delegation; Indiana (62 FR 15453) - April 1, 1997
• Direct Final Rule: Approval of Section 112(l) Program of Delegation; Indiana (62 FR 15404) - April 1, 1997 

The Indiana Database will be made available as a spreadsheet.