On October 12, 2021, the Potomac River Basin Drinking Water Source Protection Partnership (DWSPP) and ICPRB held a seminar on microplastics in the Potomac River Basin from a source water protection perspective with a focus on drinking water. The seminar was organized by the Microplastics subcommittee of the Contaminants of Emerging Concern Workgroup of DWSPP.

DWSPP is a voluntary association of water suppliers and government agencies focused on protecting sources of drinking water in the Potomac River basin. This coalition of water utilities and management and regulatory agencies enables a comprehensive approach to protecting raw water supplies in the basin.