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The document is a student resource unit to be used in teaching high school vocational agriculture students about water. Tbe hydrologic cycle and natural processes are described, with particular attention to evaporation, precipitation, and runoff. Sources of water pollution are found in industries, municipalities, individual action, and agriculture. Damage to health, recreation, esthetics, fishing, agriculture, and water supplies are some of the results of water pollution. The present situation is assessed in terms of potential controls, nutrient enrichment, toxicity levels, waste heat, gove.nmental programs, monitoring, and the special problems of agriculture. The document concludes with eighteen recommendations to improve water quality. A twelve-item bibliography is included