河水被污染了用英语怎么说

"The river water is polluted" 或者 "The water in the river is contaminated" 可以用来表示河水被污染了。

污染的来源可能有许多种，可能是工业废水、农田化肥、城市污水、垃圾和其他有害物质的排放等。

例句：

The water in the river is polluted with industrial waste.
(河水被工业废水污染了)
The contamination of the river with pesticides from nearby farms has become a major concern.
(河水因附近农田使用农药而受到污染已成为一个主要问题)
The sewage from the city has been polluting the river for years.
(城市的污水多年来一直在污染河水)