There has been a 16 per cent reduction in the amount of wastewater discharged into water bodies over this period. The bulk of wastewater discharge (about 70 per cent) constitutes effluent treated to standard quality. The share of wastewater discharged without treatment in the period 2005-2013 has varied between 0.4 and 1 per cent of overall discharged wastewater. A substantial share of wastewater discharge containing pollutants (about 69 per cent) comes from local sources (i.e. settlements and settlement-based industries).