The U.S. Environmental Protection Agency (EPA), as part of its Science to Achieve Results (STAR) program, aims to promote scientific progress towards preventing and controlling harmful algal blooms (HABs) by seeking applications proposing research to: (1) determine the effectiveness of existing nutrient treatment technologies; (2) evaluate the scale-up of emerging nutrient treatment technologies and develop new technologies; and (3) develop best management practices to help both rural and urban communities control nutrients in their watersheds.