Indiana Air Permitting Issues
Written October 17, 2019
Indiana has its own permitting system for facilities that are not required to obtain a Title V permit.
Facilities with potential emissions greater than 10 tons but less than 25 tons of VOCs must register with the state. However, if facilities agree to limit their actual emissions for any air pollutant, such as VOCs or Hazardous Air Pollutants to 20% of the major source threshold, without the use of air pollution control device then it does not need to apply for registration. Instead, the facility will fall under the Permit by Rule program.
Facilities with potential emissions over 25 tons fall into three categories. Those over 25 tons but less than 100 tons of VOCs per year should obtain a Minor Source Operating Permit. Those with potential emissions of 100 tons of VOC (major source category) can opt to obtain a Federally Enforceable State Operating Permit (FESOP) or a Title V permit. Facilities located in Lake and Porter Counties are considered major sources if potential emissions of VOCs are 25 tons or more per year.
Facilities with potential emissions of less than 10 tons of VOCs per year may elect to file a form with the state. If the facilities emissions are less than 10 tons per year, then the state will issue a Letter of Exemption. Sources are not required to apply for an exemption; however, for a one-time fee of $100.00, you may apply for a letter of exemption, which will confirm your source's exempt status by completing and submitting the relevant air permit application forms located on the IDEM Web site.
Facilities with potential emissions over 25 tons fall into three categories. Those over 25 tons but less than 100 tons of VOCs per year should obtain a Minor Source Operating Permit. Those with potential emissions of 100 tons of VOC (major source category) can opt to obtain a Federally Enforceable State Operating Permit (FESOP) or a Title V permit. Facilities located in Lake and Porter Counties are considered major sources if potential emissions of VOCs are 25 tons or more per year.
Facilities with potential emissions of less than 10 tons of VOCs per year may elect to file a form with the state. If the facilities emissions are less than 10 tons per year, then the state will issue a Letter of Exemption. Sources are not required to apply for an exemption; however, for a one-time fee of $100.00, you may apply for a letter of exemption, which will confirm your source's exempt status by completing and submitting the relevant air permit application forms located on the IDEM Web site.