These links may be useful for people working with stormwater or water quality, especially as it monetizes what respondents identify as infrastructure needs. This could also be useful for people working on economic development, community development, and sustainability.
EPA 2008 Clean Watershed Needs Survey:
The Clean Watersheds Needs Survey (CWNS) 2008 Report to Congress (PDF) (154 pp, 12823K, About PDF) summarizes the results of EPA's 15th national survey of capital costs to address water quality or water quality related public health problems. The total wastewater and stormwater management needs for the nation are $298.1 billion as of January 1, 2008. This amount includes $192.2 billion for wastewater treatment plants, pipe repairs, and buying and installing new pipes; $63.6 billion for combined sewer overflow correction; and $42.3 billion for stormwater management. Small communities have documented needs of $22.7 billion.
Data is also available, although I'm don't know the contents.
Annual reports of the EPA's Office of Wetlands, Oceans, and Watersheds:
USDA Water Quality Information Center Conferences and Calls for Papers listing: