Abstract

Recent regulations specify a cost-effectiveness analysis of implementing household water conservation measures to reduce the flow of wastewater as a prerequisite to federal funding of wastewater treatment plant construction. There is a wide variety of devices available to conserve water: hot water as well as water at ambient temperature. In this analysis we use a sample of 23 metropolitan areas to evaluate the indirect household energy savings which results from conservation devices to save hot water. Devices to conserve hot water are cost-effective in all 23 metropolitan areas up to an equivalent annual cost of $1.50/1000 gal saved under an assumption of no inflation in energy prices, and about $7.00/1000 gal saved under an assumption of 20%/yr inflation in energy prices. The impact of the indirect energy savings can be further illustrated by noting that devices to conserve ambient temperature water are cost-ineffective in all 23 metropolitan areas at equivalent annual costs above $1.00/1000 gal saved. Besides increasing the level of cost-effective household water conservation from 114 gal/day to 146 gal/day for a family of four, while providing significant economic savings, the indirect energy savings from hot-water conservation devices can provide a 46–62% reduction in energy use for residential water heating.

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