"Water is seriously polluted" 或 "The water is severely contaminated"。
水污染的来源可能包括工业废水排放、农业化肥和农药的使用、城市污水处理系统的缺陷、垃圾和垃圾填埋场、以及人类活动导致的土地利用变化等。
例句：
"Industrial waste is a major source of water pollution in this area." (工业废水是这个地区水污染的主要来源。)
"Fertipzer runoff from farms is contaminating the local water supply." (农场的化肥径流正在污染当地的水供应。)
"The city's inadequate sewage treatment system is causing severe water pollution in the nearby river." (城市不足的污水处理系统正在导致附近河流的严重水污染。)