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Tempe takes steps to protect ancient Los Guanaco tribal site while upgrading nearby water facility

Light pink building framed by bushes has sign with T and reads Kyrene Water Reclamation Facility
Tim Agne
/
KJZZ
The Kyrene Water Reclamation Facility in Tempe on June 15, 2026.

Tempe says it is taking steps to minimize disturbances to the Los Guanacos archaeological site as the city works with the U.S. Army Corps of Engineers to upgrade the nearby Kyrene Water Reclamation Facility.

Officials are reaching out to agencies and tribes, as the project may affect the site where the Ancestral O’odham people once lived.

Tempe’s historic preservation officer Zachary Lechner says the city’s treatment plan for historic properties requires them to do ground disturbance monitoring.

“The city of Tempe policy also requires archaeological monitoring, not only within an archaeological site, but also within 250 feet of an archaeological site when it's on city land," he said.

Lechner says the Tempe Historic Preservation Office helps ensure compliance with that. He says work on archaeological sites must stop within certain distances if cultural resources or ancestral remains are encountered.

Black and copper sign on pink block wall with blue trim
Tim Agne
/
KJZZ
The Kyrene Water Reclamation Facility in Tempe on June 15, 2026.
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Ignacio Ventura is a reporter for KJZZ. He graduated from the University of Southern California with a bachelor’s degree in creative writing and a minor in news media and society.