Natural clay loam as the main raw material used in this paper originates from clay findings Dilj, Croatia. The sewage sludge used for the making of clay bricks originates from the processing of the waste waters of the town of Vinkovci, Croatia. This paper displays a possibility of recycling and disposing of sewage sludge. Recycling of this type of waste represents a practical solution for the environmental polution. A physical, chemical an mineralogical characterization of the clay and the sewage sludge has been conducted. The bricks were made with addition of sewage sludge, which was previously dried at 300°C in the span of 5 – 40% by dry weight in two series. The first series consisted of sand bricks, and the second of granite bricks with the identical proportion of sewage sludge. All bricks were baked at three different temperatures: 900 °C, 100 °C and 1050 °C. The produced material underwent the following physical and chemical analysis: total linear shrinkage, adsorption of water, bending strength and the leaching of heavy metals As, Zn, Ni, Cr, Cu, Cd, Hg and Pb. The texture and surface of individual bricks are very poor. Regarding physical, mechanical and chemical features, bricks containing up to 20 % of the mass of sewage sludge are able to meet appropriate technical standards. However, bricks with more the 30 % of the mass of sewage sludge didn’t demonstrate satisfactory mechanical properties, because they are very fragile. Therefore, bricks of this nature and structure are suitable only for situations where they are not exposed to high pressures that is for the production of light bricks. The results of laboratory tests showed that there is no obvious difference in colour between the control sample and the composite bricks, except at the samples with granite where there are white spots on the surface. The reason for this is that saluble salts during baking create white colour on the surface of the bricks.