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Horticultural Water Quality
Elements Important to Plants
Primary Standard Symbol Unit of Measurement Drinking Water Standards SBWR Recycled Water Constituents 
Mandatory Health Related
Clarity / Turbidity   NTU  0.5  <1.0
Coliform Bacteria   % Tests Positive  <5.0  <2.0
Inorganic Chemicals        
Fluoride mg / L  1.4 - 2.4  0.46
Nitrate NO3-N  mg / L  45 20.2 
Secondary Standard Aesthetic  Horticultural 
Apparent Color   Units   15  18
Odor Threshold   Units  3  <5
Alkalinity     Total CaCO3     No Standard 158.3
Adj. Na Adsorption Ratio RNa  mg / L    No Standard 4.42
Hydrogen Ion Activity pH (6.5 - 8.4)  mg / L  No Standard  8.3
Equilibrium Reaction pHc  Units   No Standard  7.44
Electrical Conductivity ECw  mg / L   No Standard  1.18
Total Dissolved Solids TDS  mg / L   1,000  755
Sodium     Na  mg / L   No Standard 140
Sulfate SO4  mg / L   500 124
Iron     Fe  mg / L    0.3  0.1
Zinc Zn  mg / L  5  0.06
Manganese Mn  mg / L   0.05  <0.02
Boron mg / L   No Standard  0.48
Chloride CL  mg / L  500  148
Nutrient Content = Pounds per 1,000 square feet per foot of applied water*
Nitrogen (Actual) Lbs    1.04
Phosphorus P2O5  Lbs     0.33
Potassium K2O  Lbs     0.9
* Compared to a fertilizer program which applies 25 pounds 21 - 7 - 14 annually, this water would supply about 80% of the nitrogen and phosphorus and 107% of the potassium.