It must be noted that most parasitic diseases occur as a result of poor water quality.

必须指出的是，大多数寄生虫病的发生是由于水质不佳。

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Poor water quality and lack of adequate sanitation has increased the risk of communicable diseases such as diarrhoeal illness and measles.

质量低劣的水质和缺乏适当的卫生条件增加了腹泻病和麻疹等传染病的风险。

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The lack of proper treatment for the majority of flows in the main urban area around Victoria Harbour has resulted in poor water quality there.

由于没有适当设施处理维多利亚港周围主要市区的大部分污水，导致维港水质欠佳。

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Neglected Tropical Diseases is an umbrella term for a range of bacterial, parasitic and worm infections which flourish in areas with poor water quality and inadequate sanitation.

BBC: Plan to cut burden of tropical disease

During the next 10 years, many countries important to the United States will experience water problems shortages, poor water quality, or floods that will risk instability and state failure, increase regional tensions, and distract them from working with the United States on important US policy objectives.

FORBES: Water Risk Threatens Businesses, National Security

After surveys of high litter levels and poor bathing water quality in the past, he set up special "beach summits" to try to tackle the problem.

BBC: High tide of rubbish on Northern Irish beaches