The purpose of this study was to find what relationships exist between the costs of chemicals for municipal water treatment and the degree of raw water pollution measured by several quality indicators. Data for this study came from questionnaires on municipal water plant operating data and from raw‐water quality data for 1960. The study showed that there is a definite correlation between the cost of treating water and the pollution of that water as measured by BOD, COD, hardness, color, DO deficit, and dissolved solids. Furthermore, the cost is a function of more than one water quality indicator.
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Young et al. (1965) studied this question.