10 0.0% 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 Percentage of Unsubstan�ated Odor Complaints 1986-2011 Source: IL EPA Livestock Facility Inves�ga�on Reports *no data available 2012-2017 % Unsubstan�ated Odor Complaints Percentage of Unsubstantiated Odor Complaints to IEPA 1986-2011 fig. 4 Livestock farmers utilize Best Management Practices (BMPs) and new technologies to minimize odors from livestock farms and manure application, including feed additives, pit enzymes, tree buffers and the incorporation of manure during land application for the purpose of fertilizing crops. While the total number of complaints submitted to IEPA continue to decrease, the number of unsubstantiated odor complaints (those proven to be invalid by further IEPA review) has been increasing. In 1986, 9.7 percent of the odor complaints submitted to IEPA were unsubstantiated compared to 2011, most current year of data available, when 50 percent of the odor complaints received by IEPA were found to be unsubstantiated after follow up by the IEPA.13 (See fig. 4.) Like the declining trend of complaints submitted to IEPA, IEPA data also demonstrates that there are a declining number of Violation Notices being issued to Illinois livestock farms by IEPA. (See fig. 5.) fig. 4: IEPA, Livestock Facility Investigation Reports (1986-2017) *no data available for 2012-2017. fig. 5: IEPA, Livestock Facility Investigation Reports (1986-2017) *no data available for 2015. Number of Livestock Related VNs Issued by IEPA Number of Livestock Related Violation Notices issued by IEPA 1997-2017 fig. 5 36 38 25 16 9 9 27 20 18 24 29 25 14 12 21 17 15 6 10 9 5 0 5 10 15 20 25 30 35 40 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Number of Violation Notices Number of Livestock Related Violation Notices issued by IEPA 1997-2017