Protecting Wisconsin's Groundwater Through Comprehensive Planning
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  Iowa County
  This report provides the most current information and data found, as of May 2007, unless otherwise noted.
  Iowa County groundwater findings reports Iowa County full report Switch to Iowa County full report


  • Wisconsin has nearly 11,500 public water systems which meet the daily water needs of about 4 million people. Public water systems that are owned by a community are called municipal water systems. Iowa County has 13 municipal water systems.  Table showing water systems in Iowa County

GROUNDWATER PROTECTION POLICIES   Table showing water systems in Iowa County

  • 4 of 13 municipal water systems in Iowa County have a wellhead protection plan: Arena, Barneveld, Dodgeville and Hollandale.
  • 2 of 13 municipal water systems in Iowa County have a wellhead protection ordinance: Arena and Hollandale.
  • Iowa County has adopted an animal waste management ordinance.


  • Over $4 million have been spent on petroleum cleanup in Iowa County from leaking underground storage tanks, which equates to $183 per county resident.
  • No municipal water systems in Iowa County have spent money to reduce nitrate levels.

GROUNDWATER USE    Water use figure

  • From 1979 to 2005, total water use in Iowa County has increased from about 7.2 million gallons per day to about 11 million gallons per day.*
  • The increase in total water use is due primarily to an increase in irrigation.
  • The proportion of county water use supplied by groundwater has been between 99% about 97% during the period 1979 to 2005.*
  • Water use in Wisconsin is generally estimated for the following categories:
    • Domestic
    • Livestock
    • Aquaculture
    • Irrigation
    • Industrial
    • Commercial
    • Public use and losses
    • Thermoelectric or mining*

* Thermoelectric and mining data are not considered in water-use tables or figures on this web site. Thermoelectric-power water use is the amount of water used in the process of generating thermoelectric power. The predominant use of water is as non-contact cooling water to condense the steam created to turn the turbines and generate electricity.



  • Wisconsin has abundant quantities of high-quality groundwater, but once groundwater is contaminated, it's very expensive and often not technically possible to clean.
  • An evaluation of the susceptibility of groundwater to contamination in Iowa County can be seen in the FULL REPORT or accessed through the map link above.


  • 88% of 465 private well samples collected in Iowa County from 1990-2006 met the health-based drinking water limit for nitrate-nitrogen.   Nitrate map
  • A 2002 study estimated that 43% of private drinking water wells in the region of Wisconsin that includes Iowa County contained a detectable level of an herbicide or herbicide metabolite. Pesticides occur in groundwater more commonly in agricultural regions, but can occur anywhere pesticides are stored or applied.   Statewide pesticide map
  • 9,416 acres of land in Iowa County are in atrazine prohibition areas. Map showing atrazine prohibition areas in Iowa County
  • 95% of 20 private well samples collected in Iowa County met the health standard for arsenic.


  • There are 22 open-status sites in Iowa County that have contaminated groundwater and/or soil. These sites include 12 Leaking Underground Storage Tank (LUST) sites and 10 Environmental Repair (ERP) sites.  BRRTS map
  • There are no concentrated animal feeding operations in Iowa County.
  • There are no licensed landfills in Iowa County.
  • There are no Superfund sites in Iowa County.

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Iowa County full report Iowa County full report

For more information about this web site, its contributors, and the data contained herein, click here.

For assistance in comprehensive planning, please contact Lynn Markham, UW-Stevens Point.
For assistance on groundwater, please contact Charles Dunning, USGS.
Page contact: Webmaster, USGS
Page last updated: January 14, 2008