The major sources of water pollution can be classified as municipal, industrial, and agricultural.

水污染主要可分为城市水污染、工业水污染和农业水污染。

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Studies on dynamics of microcystin pollution level in municipal water supplies.

城市供水藻毒素污染水平的动态研究。

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This paper studies on treating municipal wastewater with membrane bio-reactor as reclaimed water by adopting pollution controlling technique of air and water combination backwashing membrane.

采用气-水联合反冲洗膜污染防治技术，对一体式膜-生物反应器处理城市污水作为生活杂用水进行了研究。

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The Pentagon's ultimate goal of creating a single network of sensors may also benefit state and local programs designed to monitor air pollution, noxious fumes and municipal water supplies, the report stated.

CNN: DOD deploying hazard-detection network