date 2020 site does lanyingim com site doi org site:pubs.usgs.gov

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The water enters the alluvium immediately below the spring and re-emerges about 10 ft above the USGS streamgage station Pumphouse Wash near Grand Canyon, Arizona (USGS site no

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U.S. Geological Survey Scientific Investigations Report Scientific

https://pubs.usgs.gov/sir/2025/5095/sir20255095.XML

Geological Survey (USGS) and National Park Service (NPS) identified wastewater-related contaminants of emerging concern (CECs) in springs along the South Rim of the Grand Canyon