Literature data on concns. of natural K-40, Ra-226 and Th-228 radionuclides in 20 samples of waste materials, which included (i) drill cuttings, (ii) solid phase of waste drilling muds and (iii) waste proppants were used to est. activity coeffs. in order to compare them with national regulations. Only materials (iii) could be deposited in a landfill. In addn., the annual effective irradn. dose resulting from use of the wastes as construction materials for houses and roads building was estd.