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Table 3 Marine water quality standard (Thailand National Environment Board)

From: Application of fuzzy evaluation technique and grey clustering method for water quality assessment of the coastal and estuaries of selected rivers in Sarawak

Parameters I II III IV V VI
pH 7.0–8.5
Dissolved oxygen < 4 < 6 < 4
Salinity Any change shall not > 10% of minimum allowable salinity
Floatable Solids Not unpleasant
Nitrate < 20 < 60
Chromium hexavalent < 50
Phosphate < 15 < 45 < 15 < 45
Turbidity < 10% of the minimum turbidity