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In Georgia, BOD decreased somewhat between 2004-2018 (by 11 %  when comparing the average of the last three years to that of the first three years). The main decrease was in the Black Sea river basin (21 %). The average for the Kura river basin increased towards 2006 but has decreased since then. Ammonium concentration showed a more pronounced decrease (50 %). The largest decrease was observed for rivers in the Kura river basin (62 %). The results for the years 2011-2013 should be treated with some caution, due to lower numbers of samples per year. This may explain some of the variability observed for ammonium concentration in this period.