Name: Surface Water Protection Economic Value - dollars per yr

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Description: This layer quantifies the yearly economic value of surface water protection provided by forests and wetlands across Maryland. About half of the water supply in Maryland is sourced from reservoirs. Natural lands are exceptionally important in maintaining water quality in reservoirs, reducing the cost to treat the water to water supply standards. This analysis is focused on the five major reservoirs in Maryland, Loch Raven, Liberty, Pretty Boy, Tridelphia, and Rocky Gorge are the major water sources for residents of the densely populated Baltimore-Washington corridor. The forests and wetlands within the watersheds of these reservoirs are of unique economic value, as help to provide clean water, reducing the cost of treatment, and avoiding the cost of expensive water treatment plant upgrades to maintain quality standards. Economic values are based on a number of factors, including the average cost savings of water treatment from having trees in the watershed, the municipal price of water, and the cost avoided of having to upgrade a treatment plant to advanced treatment. The average price was found to be $1.52 per m3 of water. Almost all of this service is concentrated in four counties- Baltimore, Carrol, Howard, and Montgomery, totaling $245 of the $246 million of value yearly. This data layer was created as part of the Maryland Department of Natural Resources "Accounting for Maryland's Ecosystem Services" program.

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