Through the centuries, the gradual development of the ships, with its construction and design was used for different purposes. From the ordinary trunk for transportation of food and man, the development of the ship went through many stages, to the extent, that now the world has develop complex shipyards. The existence of those shipyards allowed the shipbuilding industry to become highly valued segment. A Croatian shipyard had its ups and downs, but in these uncertain moments nevertheless managed to preserve the industry as it is. The theme of this thesis is two of the major shipyards in Croatia, shipyard 3. Maj d.d. in the city of Rijeka and the shipyard Uljanik d.d. in the city of Pula, with reference to the wastewater generated during the process of shipbuilding and their disposal. City of Rijeka and Pula in one word have been centres of their tribal states. City of Rijeka in terms of its administrative and city of Pula in terms of the most developed city. Due to its good strategic position of cities along the coast, same favoured the development of the industry, in this case of shipbuilding. This thesis shows a single unit that provides a description of the current situation of waste water within the shipyard 3. Maj d.d. and Uljanik d.d., within a description of reconstruction that is followed in future days. As stated, the sewage of listed shipyards currently is under reconstruction, and this process is expected to improve waste water within the same, because the current state of waste water is not fully in accordance with the regulations imposed by the Republic of Croatia.