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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 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
Sources most likely to be affected by this round are those that emit at least 2,000 tons per year of SO2 and whose emissions will be evaluated using modeling. Revised designation recommendations are not yet due to EPA under this round of designations, but the state is working with affected stakeholders to conduct modeling required by the Data Requirements Rule. EPA must complete designations under this round by December 31, 2017.
Round 4: December 31, 2020 Deadline
Any remaining undesignated areas in the state will be designated in this round, which must be completed by December 31, 2020.
On January 21, 2015, the Environmental Protection Commission approved a revision to the State Implementation Plan (SIP) to attain the 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.
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.