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River water bodies being classified as having high or good ecological status generally have much lower concentration of pollutants (BOD5, total ammonium, total phosphorus, and nitrate) and better water quality than WBs classified as having moderate to poor ecological status (Figure 7.10 and Figure 7.11).

• River water bodies classified as having high ecological status also have generally low concentration of pollutants with nitrate, total phosphorus, and total ammonium being lower than 0.1 mg NO3-N/l, 0.02 mg P/l and 0.04 mg NH4-N/l..
• There is a marked shift in water quality from water bodies having good ecological status or potential to water bodies having moderate of worse ecological status. Generally the water bodies with good status only have one-third of  the concentration levels of the water bodies in worse status.
•  There is a general trend in increasing nutrient pollutant concentrations going from moderate to poor and bad ecological status or potential.