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Data sources: Data were provided by the Ministry of Ecology and Natural Resources of Ukraine under the ENI SEIS II East project activities.

Note: The current concentration is calculated as the average of mean concentrations of BOD5 (mg O₂/l) in Ukraine for the year 2017. The total number of river sites included in the analysis is 131. The number of monitoring sites per river is given in parenthesis.

Almost one fifth of the measured sites on rivers in Ukraine have low organic matter pollution. Two thirds of sites (67 %) have a medium level (between 2.0 and 4.0 mg O₂/l) or an increased level of organic matter pollution (between 4.0 and 6.0 mg O₂/l). 16 % of the sites are highly polluted with organic matter.

Almost three quarters of the sites (14) on Pivdenni Bug have very high concentration of BOD5 (> 0.4 mg O₂/l). The Sievercki Donets and Tisa rivers also have high levels of organic matter pollution. On the Sivercki Donets 88 % of sites (14) have concentrations that are higher than 3.0 mg O₂/l. On the Tisa and Prut rivers most of the sites are moderately polluted. The river least polluted with organic matter is the Desna. 

The rivers most polluted with organic matter and ammonium are the Sievercki Donets and Pievdenni Bug. The Desna river has high levels of ammonium pollution but low organic matter pollution. The Dnister and Dnipro rivers are moderately to heavily polluted with both ammonium and organic matter. As shown in Figures 3 and 4, both concentrations are actually increasing.