Abstract
Three methods of assessing the non‐pecuniary benefits of good quality water are suggested. One depends on calculating the implicit valuation accorded them by the existing expenditure on pollution control and from the amount of “damage” caused. A second method consists in calculating all the costs imposed on users of water before and after a control programme is put into operation. Both these methods require more information about expenditure than is at present usually available. A third proposal uses biological assessment of water quality as a representative of the other “intangibles”. Since high biological quality indicates a water suitable for any other use this could be a useful approximation. When information on expenditure is also available, it is possible to calculate a cost for achieving a given quality in a particular situation, which could be used in cost‐effectiveness comparisons of different programmes or different situations.
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