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In Azerbaijan, none of the river sites were assigned to the three upper BOD classes. Moreover, no sites exceeded the national maximum allowable concentration for ammonium concentration (0.4 mg NH₄-N/l), which corresponds to the highest ammonium class. Still, 20 % of the sites had current ammonium concentration corresponding to the second highest ammonium class. The recommended ammonium concentration level for salmonid fish was always exceeded, and the cyprinid threshold was exceeded at 35 % of sites. River sites in the Kura river basin had somewhat higher ammonium concentrations and BOD than river sites outflowing to the Caspian Sea.