Quality of the water from the Pindare river Basin, In the facts corresponding to the municipalities of Pindare Mirim, Tufilandia and Alto Alegre In the State of Maranhao oleh Maria Raimunda Chagas Silva, Leonilde Vatanabe da Silva, Larissa Nascimento Barreto, Eduardo Henrique Costa Rodrigues, Rita de Cássia Mendonça de Miranda, Denilson Silva Bezerra, Dagolberto Calazans Araujo Pereira