
La contaminación hídrica o contaminación del agua es una modificación de esta, generalmente provocada por el ser humano, que la vuelve impropia, o peligrosa para el consumo, la industria, la agricultura y la pezca.
En la actualidad la mayor parte de la contaminación proviene de actividades humanas. Se da por la liberación de residuos, y contaminantes que drenan a las escorrentías, y luego son trasportados hacia los ríos, penetrando en aguas subterráneas o descargando en lagos o mares. Los derrames de petroleo en mar abierto por el hundimiento o fuga en petroleos y algunas veces derrames desde el mismo pozo petrolero.
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