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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.
In 2016 the U.S. Environmental Protection Agency (EPA) completed the second round of designations for the 2010 1-hour SO2 NAAQS. In Iowa, EPA designated Des Moines and Wapello Counties as unclassifiable/attainment and Woodbury County as unclassifiable. The attainment designations for Des Moines and Wapello Counties were based on modeling of actual SO2 emissions.
To satisfy the ongoing data requirements of the DRR, the Iowa DNR submitted a report to EPA documenting significant SO2 emission reductions from sources in Des Moines and Wapello Counties. The Iowa DNR concluded that additional modeling was unnecessary to determine that Des Moines and Wapello Counties continue to attain the 1-hour SO2 NAAQS.
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.
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.