Transboundary Santa Cruz Aquifer Data Release – Transboundary Aquifer Assessment Program

This is a release of data presented in the report "Binational Study of the Transboundary Santa Cruz Aquifer", Callegary and others, 2025

The United States and Mexico share waters in a number of aquifers that cross the international boundary. Both the United States and Mexico recognize that a greater scientific understanding of these aquifer systems and a focus on the sustainability of the aquifer and the Santa Cruz River which it supports would be beneficial to both countries. These include the fact that the aquifer is transboundary in nature, and that the water resources are needed to permit continued development. Recognizing these goals, an agreement was made to integrate hydrologic and other pertinent data from both countries and to proceed with this joint binational study of the Santa Cruz transboundary aquifer.

Datasets as shapefiles or rasters in compressed file (.zip) included in this data release:
Basemap Items (found under child item of same name):

TAAP Santa Cruz Basin boundary: "TAAP_SC_boundary.zip"

Water Quality Items (found under child item "TAAP dataset of surface- and groundwater..."):


TAAP Santa Cruz alkalinity of groundwater: "TAAP_SC_alkalinity.zip"
TAAP Santa Cruz bicarbonate concentration in groundwater (ppm): "TAAP_SC_bicarbonate_concentrations.zip"
TAAP Santa Cruz calcium concentration of groundwater (ppm): "TAAP_SC_calcium_concentrations.zip"
TAAP Santa Cruz chloride concentration of groundwater (ppm): "TAAP_SC_chloride_concentrations.zip"
TAAP Santa Cruz electrical conductivity of groundwater (uS/cm): "TAAP_SC_electrical_conductivity.zip"
TAAP Santa Cruz magnesium concentration of groundwater (ppm): "TAAP_SC_magnesium_concentrations.zip"
TAAP Santa Cruz pH of groundwater: "TAAP_SC_pH.zip"
TAAP Santa Cruz potassium concentration of groundwater (ppm): "TAAP_SC_potassium_concentrations.zip"
TAAP Santa Cruz sodium concentration of groundwater (ppm): "TAAP_SC_sodium_concentrations.zip"
TAAP Santa Cruz sulfate concentration of groundwater (ppm): "TAAP_SC_sulfate_concentrations.zip"
TAAP Santa Cruz temperature of groundwater: "TAAP_SC_temperature.zip"

Geographic Items (found under child items of same name):


TAAP Santa Cruz Basin and Range Physiographic Province: "TAAP_SC_BasinAndRangeProvince.zip"
TAAP Santa Cruz soils, Santa Cruz Aquifer, Sonora: "TAAP_SC_SANTA_CRUZ_soils.zip"
TAAP Santa Cruz geology: "TAAP_SC_geology.zip"
TAAP Santa Cruz hydrostratigraphic units: "TAAP_SC_hydrostatigraphy.zip"