In September 1999, ORSANCO became a signatory to the Declaration of Partnership for the 21st Century with nine other interstate water management organizations at a meeting of the Interstate Council on Water Policy. With this Declaration, signatories agreed to work together to further the development of watershed-based approaches to watershed management. Signatory organizations will develop a network for information sharing and coordination; collaborate on special projects and studies that impact multiple jurisdictions; and develop and recommend water resource policies on issues of a regional, national and international nature.

Signatory organizations:

• Delaware River Basin Commission
• Great Lakes Commission
• Interstate Commission on Potomac River Basin
• Interstate Council on Water Policy
• Interstate Sanitation Commission
• New England Interstate Water Pollution Control Commission
• Ohio River Basin Commission
• Ohio River Valley Water Sanitation Commission
• Susquehanna River Basin Commission
• Upper Mississippi River Basin Commission