Hartley Reverse Osmosis Water Treatment Facility


  • Local Governments
  • Public Utilities


  • Construction
  • Engineering
  • Potable Water
  • Water


  • Hartley, Iowa

The northwestern Iowa community of Hartley derives its drinking water from the Dakota Sandstone aquifer. This groundwater source was treated by aeration and filtration for iron removal. However, the City’s treatment facility was showing signs of its advanced age, having equipment dating to the 1940s and 1950s. In recent years, Hartley had developed a reputation for poor quality drinking water.

HR Green first completed a preliminary engineering report for the City of Hartley to identify a workable water treatment solution and help the City plan for its funding. Subsequently, HR Green designed a new treatment facility including the following major elements: new treatment building with two 140 gpm (0.2 mgd) Reverse Osmosis treatment trains and associated chemical feed systems; variable frequency drives for existing well pumps to increase energy efficiency; new aeration equipment for elimination of dissolved gases; new chemical storage and feed systems; buried yard piping and other related site work and appurtenances.

With the project substantially completed and an overall negative change order amount, the City was able to investment a significant amount of their additional available funds in replacing some existing piping and valves and rehabilitating the interior and exterior of two existing buildings.  The new water treatment facility was put into operation in July 2010.  The new facility now provides the citizens of Hartley with some of the highest quality drinking water available in Iowa.

At a glance:

  1. HR Green completed a preliminary report to identify workable water treatment solution. Subsequently, HR Green designed and constructed a 308 gallon per minute (gpm) reverse osmosis (RO) water treatment facility.
  2. To eliminate site acquisition and facility relocation costs, a unique building layout and secondary containment around the engine generator were used to fit the treatment facility on the existing site between an existing water tower, well and clearwell without moving any existing facilities and keeping the existing facilities in operation throughout construction.
  • 2010 APWA Iowa Chapter Environmental Category Project of the Year;
  • 2011 ACEC Iowa Chapter Grand Place Award in the Water and Wastewater Category; and
  • 2011 ACEC National Recognition Award.
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