Pollution has been defined as “too much of anything” and that is about as satisfactory as any other definition. Thus, the discharge of sewage into a bathing lake to such an extent as to render the waters unsatisfactory for bathing purposes is definitely pollution. By the same token, so is the discharge of acid wastes in sufficient quantity so that the biological balance of a stream is upset also pollution. In like manner, the discharge of heated water into an underground stratum from which cooling water is taken may constitute pollution and, in some cases, decaying vegetation or fertilizer washed from the soil by surface runoff has been considered pollution.

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