Water is undoubtedly an essential resource for humanity and a key factor in the quality of life of populations worldwide. To decrease water turbidity, aluminum sulfate, an inorganic coagulant is used. However, this compound is unable to meet current demand. Therefore, alternative options from natural plant species are sought. Objective: Determine coagulant activity from aqueous, 10% ethanol, 10% acetic acid extracts obtained from dried and fresh papaya seeds (Carica papaya), in comparison with positive controls: aluminum sulfate Al2