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Type of Jurisdictions Involved


Specific Jurisdictions Involved

  • Villages of Black Earth and Mazomanie - Dane County;
  • Village of Arena - Iowa County


  • Dane
  • Iowa



Type of Agreement

Consolidation of Services

Implementation and Incubation

  • Implemented in 2001
  • Discussions began in 1990

Factors Involved

  • The Wisconsin DNR concluded in 1990 that the wastewater treatment facilities in the Villages of Black Earth and Mazomanie were outdated and needed to be fixed and updated
  • Villages realized that individually renovating their facilities would be much more costly than upgrading completely and building one joint wastewater treatment plant


  • An upgraded wastewater treatment plant and reduced costs of treatment plant construction and operation


  • Increased level of cooperation among communities involved Communities formed the Dane-Iowa County Wastewater Commission Positive revenues from the joint wastewater treatment plant generated - Wisconsin Heights School and Village of Cross Plains are considered customers to the plant
  • Estimate that Villages of Mazomanie and Black Earth each will save 12% of the costs they would have incurred had each village built its own treatment facility Villages of Mazomanie and Black Earth also estimate 24% in savings and operation and maintenance over individual smaller plants
  • Project completed $800,000 below the total $11 million project budget Village of Mazomanie and Black Earth save $65,000 - $75,000 annually on operation and maintenance
  • Lead to discussions of combing other services (electric utility)


Mazomanie Village Clerk - Sue Dietzen

Black Earth Village President

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