Evaluation of Green Alternatives for Combined Sewer Overflow Mitigation

Evaluation of Green Alternatives for Combined Sewer Overflow Mitigation

Author: U S Environmental Protection Agency

Publisher: CreateSpace

Published: 2014-08-01

Total Pages: 46

ISBN-13: 9781500647322

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The mitigation of combined sewer overflows (CSOs) is a significant environmental and financial challenge, particularly for older urban communities where these overflows are most prevalent. Communities are increasingly examining more environmentally sustainable "green" alternatives for addressing these problems. These green solutions are often endorsed because of the additional environmental, social, and economic benefits they produce. A growing body of reports and case studies - briefly reviewed here - describes and attempts to quantify these benefits as economic impacts. Most estimates of economic impacts have focused on a comparison of the costs for construction and operation of green alternatives to traditional infrastructure approaches. Some of these have attempted to estimate the economic value of communitywide environmental and aesthetic gains, and other economic benefits are occasionally identified. This report develops a broad framework, or taxonomy, for identifying and organizing the socio- economic impacts of sewer infrastructure projects. It focuses on a green project in Cincinnati, Ohio that has adopted broader economic goals. The report then uses this example to illustrate how the taxonomy can be used by community officials engaged in storm water management to obtain a fuller understanding of the economic benefits of green alternatives for CSO mitigation.


Evaluating Changes in Water Quality: A Hedonic Model Linking Combined Sewer Overflows and Seattle's Housing Market

Evaluating Changes in Water Quality: A Hedonic Model Linking Combined Sewer Overflows and Seattle's Housing Market

Author: Matthew Van Deren

Publisher:

Published: 2017

Total Pages: 60

ISBN-13:

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This paper estimates the economic impact of combined sewer overflows on the housing market in Seattle, Washington. Using residential sales data from Seattle, I estimate a hedonic valuation model that controls for housing characteristics, as well as spatial and temporal effects, to predict the impact of combined sewer overflows on residential housing prices. I find that a 100,000-gallon increase in the average annual overflow discharged from outfalls within 300 meters of a home is associated with a 0.053% reduction in the final sale price of a home. For the average home in my sample, exposed to the average amount of combined sewer overflow, the price reduction is estimated to be $18,860.23, when compared to similar homes near outfalls that reported no activity from 2010-2014. My findings reveal some of the important economic benefits of improving water quality by reducing the frequency and severity of combined sewer overflows.