Figure 2
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Data sources
- Data were provided by the Environment Quality Monitoring Division of the State Hydrometeorological Service of the Ministry of Agriculture, Regional Development and Environment, under the ENI SEIS II East project activities.
- Water quality database of Dniester river basin, State Hydrometeorological Service.
Note: The graphs show the ammonium (left) and BOD5 (right) concentration classes at river monitoring sites in the two river basins of the Republic of Moldova (Prut basin and Nistru (Dniester) basin), in the Black Sea basin in Moldova (Danube and Cogîlnic) and for the whole country, based on the average of the annual mean concentrations for 2017. The number of monitoring sites per river basin is given in parenthesis.
At present, 15 % of the sites in rivers in Moldova have low ammonium concentrations (< 0.04 mg N/l), and one third have moderate concentrations (between 0.04 and 0.1 mg N/l). Almost half of sites have high or very high concentrations of ammonium; all except one site are located in the Nistru (Dniester) basin. Two sites out of six on the Prut basin have low ammonium concentrations. These six sites are moderately polluted by ammonium. The nitrate measured in the Danube river in Moldova falls within the moderately polluted class (between 0.1 and 0.2 mg N/l). The ammonium pollution in the River Cogîlnic is between moderate and high (0.2 mg N/l).
Almost 70 % of river sites in the Republic of Moldova are highly polluted with organic matter, the remainder are moderately polluted (2.0-3.0 mg O2/l). In the Nistru (Dniester) basin, two sites are moderately polluted with organic matter and three are highly polluted. Six sites show very high pollution with organic matter (BOD5 > 4 mg O2/l). In the Prut basin, three sites are moderately polluted with organic matter and three are highly polluted. The BOD5 measured in the Moldavian part of Danube river is 2.51 mg O2/l (moderate pollution). The River Cogîlnic is highly polluted with organic matter BOD5 is 3.35 mg O2/l).