The impact of preventing water pollution on the preservation of biological diversity is clear. Biodiversity depends on good water quality. Just as water forms an ecosystem, so it is on the list of biodiversity. Preserving water quality therefore means helping to preserve biodiversity. Congolese lawmakers have laid down rules to protect water quality and thereby ensure the sustainability of biodiversity. But these rules are not complete. They need to be backed up by implementing measures. Politicians, who are primarily concerned, are invited to take these measures to complete the existing legal arsenal in the field of water and biodiversity, and to allocate substantial human and financial resources. As beneficiaries of water and biodiversity, the public must not only exert pressure on politicians, but also and above all take initiatives through their associations to stem or halt the loss of biodiversity.