An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Working Paper: The Implicit Price of Aquatic Grasses

Paper Number: 2014-06

Document Date: 12/2014

Author(s): Dennis Guignet, Charles Griffiths, Heather Klemick and Patrick Walsh

Subject Areas: Valuation; Air Pollution; Water Pollution

JEL Classification: Environmental Economics: Valuation of Environmental Effects; Air Pollution; Water Pollution; Noise; Hazardous Waste; Solid Waste; Recycling

Keywords: aquatic grasses; chesapeake bay; ecological input; ecosystem services; hedonics; submerged aquatic vegetation; sav; water quality

Abstract: Almost 30% of aquatic grasses worldwide are either lost or degraded (Barbier et al, 2011). The Chesapeake Bay is no exception, with levels of submerged aquatic vegetation (SAV) remaining below half of the historic levels. This decline is largely attributed to excessive nutrient and sediment loads degrading Bay water quality. SAV provide many important functions to natural ecosystems, many of which are directly beneficial to local residents.

To understand the implicit value residents place on SAV and the localized ecosystem services it provides, we undertake a hedonic property value study using residential transaction data from 1996 to 2008 in eleven Maryland counties adjacent to the Chesapeake Bay. These data are matched to high resolution maps of Baywide SAV coverage. We pose a quasi-experimental comparison and examine how the price of homes near and on the waterfront vary with the presence of SAV. On average, waterfront and near-waterfront homes within 200 meters of the shore sell at a 5% to 6% premium when SAV are present. Applying these estimates to the 185,000 acre SAV attainment goal yields total property value gains on the order of $300 to 400 million.

Published: Guignet, Dennis, Charles Griffiths, Heather Klemick and Patrick J. Walsh. 2014. "The Implicit Price of Aquatic Grasses,"  Marine Resource Economics 32(1): 21-41.

This paper is part of the Environmental Economics Working Paper Series.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.