SOURCES OF DRINKING WATER

• 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.  

GROUNDWATER PROTECTION POLICIES   

• 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.

MONEY SPENT ON CLEANUP

• 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    

• 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.

SUSCEPTIBILITY OF GROUNDWATER TO CONTAMINANTS   

• 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.

GROUNDWATER QUALITY

• 88% of 465 private well samples collected in Iowa County from 1990-2006 met the health-based drinking water limit for nitrate-nitrogen.  
• 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.   
• 9,416 acres of land in Iowa County are in atrazine prohibition areas.
• 95% of 20 private well samples collected in Iowa County met the health standard for arsenic.

POTENTIAL SOURCES OF CONTAMINANTS

• 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.  
• 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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