Dodge County 2016-2017
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Final Township Testing Nitrate Report: Dodge County 2016-2017 March 2019 Minnesota Department of Agriculture Pesticide and Fertilizer Management Division In accordance with the Americans with Disabilities Act, this information is available in alternative forms of communication upon request by calling 651-201-6000. TTY users can call the Minnesota Relay Service at 711. The MDA is an equal opportunity employer and provider. ACKNOWLEDGEMENTS MDA PRIMARY AUTHOR Nikol Ross and Ben Bruening MDA CONTRIBUTORS AND REVIEWERS Kimberly Kaiser, Larry Gunderson, and Jen Schaust FUNDING Project dollars provided by the Clean Water Fund (from the Clean Water, Land and Legacy Amendment). 2 TABLE OF CONTENTS Acknowledgements ....................................................................................................................................... 2 Table of Contents .......................................................................................................................................... 3 List of Figures ................................................................................................................................................ 4 List of Tables ................................................................................................................................................. 5 Executive Summary ....................................................................................................................................... 7 Introduction .................................................................................................................................................. 8 Background ................................................................................................................................................. 10 Township Testing Methods ......................................................................................................................... 14 Initial Results ............................................................................................................................................... 20 Final Results ................................................................................................................................................ 27 Summary ..................................................................................................................................................... 32 References .................................................................................................................................................. 33 Appendix A .................................................................................................................................................. 36 Appendix B .................................................................................................................................................. 38 Appendix C .................................................................................................................................................. 45 Appendix D .................................................................................................................................................. 50 Appendix E .................................................................................................................................................. 51 Appendix F .................................................................................................................................................. 52 Appendix G .................................................................................................................................................. 54 Appendix H .................................................................................................................................................. 55 Appendix I ................................................................................................................................................... 60 Appendix J ................................................................................................................................................... 61 Appendix K .................................................................................................................................................. 62 3 LIST OF FIGURES Figure 1. Townships Tested in Dodge County ............................................................................................... 9 Figure 2. Statewide Geomorphology Layer, Sediment Association in Dodge County (DNR, MGS, and UMD, 1997) ................................................................................................................................................. 12 Figure 3. Minnesota Townships with Vulnerable Groundwater and Row Crop Production ...................... 14 Figure 4. Water Table Aquifer Vulnerability Rating in Dodge County ........................................................ 16 Figure 5. Well Locations and Nitrate Results from Initial Dataset in Dodge County .................................. 21 Figure 6. Well Locations and Nitrate Results from Final Well Dataset in Dodge County ........................... 28 Figure 7. Feedlot Locations in Dodge County (MPCA, 2018) ...................................................................... 41 Figure 8. Fertilizer Spills and Investigations in Dodge County (MDA, 2017) ............................................... 43 Figure 9. Land Cover in Dodge County (USDA NASS Cropland Data Layer, 2013) ...................................... 46 Figure 10. Active Groundwater Use Permits in Dodge County (MDNR, 2017) ........................................... 49 4 LIST OF TABLES Table 1. Vulnerability Ratings Based on the Geomorphology of Minnesota, Sediment Association Layer 15 Table 2. Homeowner Participation in Initial and Follow-Up Well Water Sampling, Dodge County ........... 17 Table 3. Dodge County Township Testing Summary Statistics for Initial Well Dataset .............................. 22 Table 4. Estimated Population with Water Wells Over 10mg/L Nitrate-N, Dodge County ........................ 23 Table 5. Nitrate Concentrations within Sampled Groundwater Aquifers ................................................... 25 Table 6. Initial and Final Well Dataset Results, Dodge County ................................................................... 27 Table 7. Dodge County Township Testing Summary Statistics for Final Well Dataset ............................... 29 Table 8. Township Nitrate Results Related to Vulnerable Geology and Row Crop Production, Dodge County ......................................................................................................................................................... 30 Table 9. Animal Unit Calculations (MPCA, 2014) ........................................................................................ 39 Table 10. Feedlots and Permitted Animal Unit Capacity, Dodge County ................................................... 40 Table 11. Fertilizer Storage Facility Licenses and Abandoned Sites, Dodge County ................................... 42 Table 12. Spills and Investigations by Chemical Type, Dodge County ........................................................ 44 Table 13. Fertilizer Related Spills and Investigations by Township, Dodge County.................................... 44 Table 14. Land Cover Data (2013) by Township, Dodge County (USDA NASS Cropland Data Layer, 2013) .................................................................................................................................................................... 47 Table 15. Active Groundwater Use Permits by Township, Dodge County.................................................. 48 Table 16. Active Groundwater Use Permits by Aquifer, Dodge County ..................................................... 48 Table 17. Reasons Wells Were Removed from the Final Well Dataset by Township, Dodge County ........ 51 Table 18. Completed Site Visits for Wells Removed from the Final Well Dataset by Township, Dodge County ......................................................................................................................................................... 51 Table 19. Aquifer Type Distribution of Wells in Minnesota Well Index ...................................................... 53 Table 20. Property Setting for Well Location .............................................................................................. 55 Table 21. Well Construction Type ............................................................................................................... 55 Table 22. Age of Well .................................................................................................................................. 55 5 Table 23. Depth of Well .............................................................................................................................. 56 Table 24. Unique Well ID Known ................................................................................................................ 56 Table 25. Livestock Located on Property .................................................................................................... 56 Table 26. Fertilizer Stored on Property ....................................................................................................... 57 Table 27. Farming on Property ..................................................................................................................