The invention relates to a method for determining an optimal dose of coagulant for raw water comprising: - a step for determining a value for raw water of a first organic parameter; - a step of determining a value for the raw water of a second mineral parameter; a step of determining a water class for the raw water, characterized by the value of the first organic parameter and the value of the second mineral parameter; - a step of determining a value for the raw water of a third organic parameter; - a step of defining a target value for the settled water from the third organic parameter; a step of selecting a function between the third organic parameter and an added dose of coagulant, said function being selected for the water class and for the value for raw water of the third organic parameter; - a step of using the function to determine a first dose of coagulant to reach the target value.
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