Concrete is the widely used construction material made up of different constituents whichrnlater determine the property of final products. Since about 75% of the concrete matrix isrnmade up of aggregate particles, the properties and strength of concrete is mainly affected byrnthe nature and proportions of fine and coarse aggregates. This research was focused onrnassessing the potential factors affecting the quality of sand in the rivers around Woldia townrnwhich are the main sources of sand for the construction projects of the north Wollo zone andrnother towns of the Amhara region. In collecting sand samples from the exposed scenario,rneach single external factor was considered and tested by field test for its effect on the sandrnproperty. Based on the results of field tests, the potential factors affecting the properties ofrnriver sand were identified and further examined with different laboratory tests. Thernlaboratory results of river sand samples collected from both controlled and exposed scenariosrnwere interpreted. In the sand source rivers, there were external factors affecting sandrnproperties with various degree of influence. The human, animal and truck action; soil, leavesrnand flora; and water flow of the river has considerable effect on the properties of river sand.rnWhile detergent and sewage from the town shows slight effect on the properties of sand. Inrnorder to know the effect on the compressive strength of concrete, the C25 concrete specimensrnwere produced and tested for both controlled and exposed scenarios. Based on the existingrnfactors in the sand source rivers, the research recommends the possible ways of treatmentrnwhich helps to produce a consistent product.