The trend of lowering of the pollution which is shown for the major watercourses is positive in regard
to the water quality, but unfortunately, this trend is a result of the lowered intensity of industrial activity,
and not as a result of the undertaken measurements for protection of the surface waters. In addition to this
we can add the fact that certain smaller confluents are being turned into collectors of wastewaters that emanate from the discharges of the major polluters. The quality of the surface water is better in areas with
low population density and areas without industry.