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Waterwatch resources

Water Quality Rating Guidelines

Test Excellent Satisfactory Poor
Conductivity(µS/cm) less than 100 100-500 more than 500
Turbidity (NTU) less than 2 2-5 more than 5
pH 7-8 6.5-7 or 8-9 less than 6.5
more than 9
Dissolved Phosphate, PO4 (DRP) (mg/L) less than 0.01 0.01-0.03 more than 0.03
Dissolved Nitrate, NO3-N (mg/L) less than 0.15 0.15-0.5 more than 0.5
Dissolved Oxygen (%) more than 90 80-90 less than 80

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Page last updated on: 17/08/2010