sentences:  Eutrophication is a growing concern, with about one third of the total volume of water held in strategic storage approaching the point where it is no longer fit for purpose without significant and costly management intervention.Return flows out of mining areas, particularly from gold mining activities, are rapidly deteriorating, with highly acidic water starting to decant from abandoned and derelict mines.55% of wastewater treatment plants, especially smaller ones, do not meet effluent standards and some do not even measure effluent quality.