Water content is an important feature of wood in its use. The quantity of water in timber and its variability throughout the year is very important. The purpose of this work was to determine how the content of the water in wood chips and sawdust changes over months and seasons. The results should contribute to a more real way of payment under ATRO weight, which represents the absolute dry wood. The water content of fresh wood chips and sawdust was measured by hygrometer DFO-80; the mass of samples was measured with digital scale AND EK-6000i. Research was conducted throughout the year. Total number of samples was 527. Company, where the research took place, produces pellets exclusively of conifers, so the chips were separated by tree species: spruce, fir and pine. The highest water content was in pine chips, while between spruce and fir chips are no significant differences. Sawdust contains different tree species. Results showed that the water content does not change as significantly as water content in wood chips and is slightly lower through out the month as well as throughout the year.