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Photo from U.S. Geological Circular 1225--The Quality of Our Nation's Waters--Nutrients and Pesticides

Aerial view of a portion of the Rio Grande Valley.

(Photo by Sherman R. Ellis)

Concentrations of nitrate in water from major aquifers in the Rio Grande Valley were less than 2 milligrams per liter, indicating that movement of shallow ground water into the deeper parts of the aquifer is minimal.

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