Physico-chemical parameters such as Temperature, Water
Velocity, pH, Electrical Conductivity, Total Dissolved Solid,
Dissolved Oxygen, Nutrients (Nitrate, Ammonium and
Orthophosphate), Suspended Solids, Alkalinity and Total
Hardness were measured. Judged from the parameters, Mae
Tao Stream was classified to Type III of the Surface Water
Quality Standard of Thailand for agriculture at all sampling
sites.