Indiana (Part 63) MACT Standards Delegations

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, with the exception of Section 112(r), regardless of a source's Part 70 (Title V) applicability.

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. Although IDEM’s program was approved as straight delegation, IDEM has occasionally requested approval of state requirements that adjust a section 112 standard.  The criteria for EPA’s approval of State rules which adjust section 112 standards are set forth at 40 CFR 63.92. Visit Indiana NSPS and NESHAP delegation for additional documents.

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

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 

Delegation Request and Other Historical Documentation

• IDEM NESHAP and NSPS Update (pdf) (3.86 MB, Nov. 10, 2014)
• IDEM NESHAP and NSPS update (pdf) (3.24 MB, April 10, 2012)
• IDEM NESHAP and NSPS update (pdf) (633.43 KB, Apr 19, 2011)
• EPA Approval (pdf) (824.44 KB, May 30, 2007)
• IDEM 112 (l) Delegation Request (pdf) (281.48 KB, Feb. 8, 2007)
• 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 (pdf) (2.82 MB, Nov. 30, 2005)
• IDEM 112 (l) Delegation Request (pdf) (2.1 MB, Sep. 19, 2005)
• IDEM 112 (l) Delegation Request (pdf) (435.26 KB, Mar. 10, 2005)
• IDEM 112 (l) Delegation Request (pdf) (593.9 KB, Feb. 14, 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 (pdf) (1.16 MB, Dec. 29, 2003)
• IDEM 112 (l) Delegation Request Update (pdf) (220.89 KB, Oct. 30, 2003)
• IDEM 112 (l) Delegation Request (pdf) (508.53 KB, Jun. 30, 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 (pdf) (3.15 MB, Jan. 6, 2000)

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

• EPA Approval for 40 CFR part 63 subpart UUUU (pdf) (447.24 KB, Feb. 5, 2016)
• IDEM Delegation Request for 40 CFR Part 63 Subpart UUUUU (pdf) (988.45 KB, Nov 6, 2014)
• IDEM Delegation Request for 40 CFR Part 63 Subpart X (pdf) (3.11 MB, Jan. 8, 2014)
• Approval of Clean Air Act Section 112 (l) 40 CFR  part 63 Subparts II, CCC, MMMM, PPPP, and DDDDD; Indiana (72 FR 36702) - July 5, 2007
• Approval of the Clean Air Act Section 112 (l) Delegation of National Emission Standards for Hazardous Air Pollutants for Reinforced Plastic Composites Production (40 CFR part 63 Subpart WWWW); 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 (40 CFR subpart VVV); 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 (40 CFR part 63 Subpart X); Indiana (71 FR 48923) - Aug. 22, 2006
• IDEM Delegation Request for 40 CFR Part 63 Subparts VVVV and WWWW (pdf) (4.1 MB, Jun. 20, 2005)
• IDEM delegation request for 40 CFR part 63 subpart X (pdf) (4.12 MB, Jul. 3, 2003)