Additional Reclaimed Water Infrastructure

The City of Flagstaff has been using reclaimed water for irrigation since 1965. The City's reclaimed water system was expanded in the mid-1990's when the Rio de Flag Water Reclamation Plant was constructed as a scalping plant, treating liquids only and sending solids to the Wildcat Hill Water Reclamation Plant. Effluent from both Water Reclamation Plants is currently distributed for use. 

As a part of the reclaimed water system, the "purple pipe" distribution network was designed to provide reclaimed water to larger-volume outdoor water users as a way to conserve potable water supplies for human consumption and household uses. The map, below, displays the current reclaimed water pipe networks.

Today, reclaimed water makes up 20% of the city's total deliveries. In the future, expansion of the existing reclaimed water infrastructure could offset even more of our potable water usage and allow for a variety of new reclaimed water users, including businesses and households.

Purple Pipe system Thumbnail Learn more about reclaimed water and our current usage


spigot Thumbnail

Toilet Thumbnail

Doller Sign

Considerations for Expanding the System


  • Identify remaining options for large volume outdoor users, including neighborhoods
  • Determine the potable volume offset by converting to reclaimed water


  • Identify options for retrofitting existing homes and businesses for dual plumbing
  • Identify new developments as options for dual plumbing
  • Determine potable volume offset by converting to reclaimed water


  • Cost to construct pipeline and any additional storage required 
  • Annual operation and maintenance costs
  • Necessary easements
  • Perform cost/benefit analysis of potable volume saved, avoided costs, etc.
  • Weigh system expansion against other water supply options