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This web page provides links to recent State Implementation Plan (SIP) submissions that Iowa has made to EPA. The web page includes links to information about recent Iowa designation recommendations for National Ambient Air Quality Standards (NAAQs) that were promulgated or revised starting in 2006.
Questions about the information on this web page may be directed to Matthew Johnson at 515-725-9554 or Matthew.Johnson@dnr.iowa.gov; or Jim McGraw at 515-725-9543 or Jim.McGraw@dnr.iowa.gov.
The DNR is currently not making any comments on proposed NAAQs.
2010 SO2 (Includes Muscatine 1-hour SO2 Nonattainment Area)
Round 1: Muscatine Nonattainment Area
Remainder of State
On March 2, 2015, the U.S. District Court for the Northern District of California accepted a Consent Decree to resolve litigation concerning the deadline for completing designation for the 2010 1-hour SO2 NAAQS. The Consent Decree requires that designations for all remaining undesignated areas in the country be completed in three additional rounds: the first round by July 2, 2016, the second round by December 31, 2017, and the final round by December 31, 2020.
A summary of actions undertaken in these new rounds of designations are provided below. Additional information regarding the Consent Decree and the 1-hour SO2 designations process can be found on EPA’s website: https://www3.epa.gov/so2designations/
Round 2: July 2, 2016 Deadline
The state has provided to EPA updated designation recommendations for three counties in Iowa (Des Moines, Wapello, and Woodbury) affected by this round of designations. EPA has not yet finalized designations under this round, but must do so by July 2, 2016.
Round 3: December 31, 2017 Deadline
On January 5, 2017, the State provided to EPA an amended designation recommendation for all areas in the State not yet designated for the 2010 1-hour SO2 NAAQS. A technical support document that also addressed information required to be submitted under the Data Requirements Rule accompanied the updated recommendation. EPA must consider the State’s amendment and finalize 1-hr SO2 designations for Round 3 by December 31, 2017.
Round 4: December 31, 2020 Deadline
If there are any remaining undesignated areas in the state, they will be designated in this round, which must be completed by December 31, 2020.
Annual Reporting Requirements
On August 21, 2015, the U.S. Environmental Protection Agency (EPA) published the Data Requirements Rule for the 2010 1-Hour Sulfur Dioxide (SO2) Primary National Ambient Air Quality Standard) (DRR, 80 FR 51051). The rule added provisions in 40 CFR 51.1205(b) that require air agencies to submit a report to EPA documenting sulfur dioxide (SO2) emissions in areas were modeling of actual SO2 emissions served as the basis for designating the area attainment for the 2010 1-hour SO2 NAAQS. The report must include an assessment of the cause of any emissions increases from the previous year and a recommendation regarding whether additional modeling is needed.
Iowa currently has two areas that have been designated as not meeting (nonattainment) the National Ambient Air Quality Standards (NAAQS). These areas are in Council Bluffs (lead nonattainment) and Muscatine (1-hour sulfur dioxide (SO2) nonattainment). For each area the DNR submitted a plan called a nonattainment SIP that requires emission reductions and other air pollution control measures necessary to attain the NAAQS. Both plans are being fully implemented and air quality monitoring shows that both nonattainment areas are meeting the NAAQS.
The State of Iowa has asked EPA to redesignate the Council Bluffs lead nonattainment area to attainment. To ensure that the area will continue to meet (maintain) the NAAQS in the future, the DNR developed a Maintenance SIP. Once EPA approves the Maintenance SIP, they can also redesignate the area to attainment. The DNR is currently working on a Maintenance SIP for the Muscatine nonattainment area.
Council Bluffs Lead Maintenance Area
On January 21, 2015, the Environmental Protection Commission (EPC) approved a revision to the State Implementation Plan (SIP) to attain the 2008 lead National Ambient Air Quality Standards (NAAQS) in Council Bluffs. The transmittal letter and SIP revision are dated January 30, 2015, and were forwarded to the U.S. EPA on February 3rd for federal review. EPA fully approved the Council Bluffs Lead Nonattainment SIP on February 26, 2016.
Council Bluffs Lead Nonattainment SIP
Council Bluffs Lead Nonattainment SIP - Final EPA Approval
On September 18, 2017, the State of Iowa requested that EPA redesignate to attainment the portion of Council Bluffs designated nonattainment for the 2008 lead NAAQS. A Maintenance SIP developed by the DNR accompanied the State of Iowa's request. EPA approved the maintenance SIP and processed the redesignation request on October 4, 2018. The area is now designated "Attainment" for the 2008 lead NAAQS. (Note, areas that have been redesignated from nonattainment to attainment are often referred to as "maintenance" areas. That is not an official designation, it is just common terminology.)
State of Iowa Redesignation Request
Council Bluffs Lead Maintenance SIP
Redesignation to Attainment
Muscatine 1-hour SO2 Nonattainment Area
On May 17, 2016, the Environmental Protection Commission approved a revision to the State Implementation Plan (SIP) to attain the 1-hour SO2 National Ambient Air Quality Standards (NAAQS) in Muscatine county. The SIP revision was forwarded to U.S. EPA on May 17th for federal notice and approval.
On February 18, 2014, the Environmental Protection Commission approved a revision to the State Implementation Plan (SIP) to prevent future violations of the 24-hour fine particulate (PM2.5) National Ambient Air Quality Standards (NAAQS) in Muscatine. The SIP revision was forwarded to U.S. EPA on February 18th for federal notice and approval. EPA approved the SIP revision on December 1, 2014.
2012 PM2.5 Infrastructure SIP
The infrastructure SIP for the 2012 PM2.5 NAAQS was submitted to EPA on December 15, 2015.
2010 NO2 Infrastructure SIP
The infrastructure SIP for the 2010 NO2 NAAQS was submitted to EPA on July 23, 2013.
A revision to the 2010 NO2 infrastructure SIP to address the interstate transport requirements of Clean Air Act Section 110(a)(2)(D)(i)(I) was submitted to EPA on March 1, 2017.