Since approximately 1840, irrigation has been required for agriculture in the Laguna Region. This activity might have changed soil chemical properties throughout time. The objective of this work was to compile soil chemical data of irrigated soils in order to document the nature and changes of soil properties. Data of organic matter, pH, electrical conductivity and cation exchange capacity from irrigated areas and non-irrigated areas of 1975 and 1997 were compared. Also, digitized soil information of the Mexican Durango and Coahuila states was examined using a Geographic Information System to obtain soil maps of the region and to locate soil sample sites. Means comparison analysis was used to statistically contrast soil parameters from non-irrigated areas against irrigated areas. Also, histograms and graphs of soil data versus depth were used to display the ranges of soil properties. The results showed that organic matter diminished by 50 percent in irrigated soils in 1997 compared with 1975; pH values increased by 6% in irrigated soils; cation exchange capacity decreased II% in soils under irrigation; and the electrical conductivitydid not show statistical changes.