Historical sources mention numerous ponds in Kozy in the 17th and 18th centuries. In addition to fish farming, the ponds were used to provide energy. The dammed up water could drive a mill wheel. At their peak, six water mills worked in the area of Kozy. Besides flour production, watermills also powered sawmills. Preserved at the confluence of the Pisarzówka and Kozówka streams are the remains of the dams of two water-powered grain mills. These mills were located in close proximity and functioned on farms numbered 101 and 152. Both mills already existed in the 18th century and operated until 1942 and 1937 respectively. The mill on farm number 101 belonged to the families: Sztaf, Lasek, Czerpak, Handzlik, Zuber and Olma. The mill at no. 152 was run by the following families: Durajczyk, Olma, Fusek, Nycz and Barabasz. In Polish folk culture, the miller was a distinguished member of the peasantry, right next to the blacksmith or the carpenter. They were usually wealthier than the other farmers in the village, and their exceptional and unique occupation was even regarded as sacred. The house no. 101, where one of the two mills in Kozy Dolne operated, is an example of the local rural architecture that is becoming increasingly rare.