The U.S. Environmental Protection Agency (EPA), as part of its Small Business Innovation Research (SBIR) program, is seeking proposals from the small businesses to develop novel environmental technologies in the following topics areas. CLEAN AND SAFE WATER Nature-based Solutions for Water Reuse Technologies for the Treatment of PFAS in Wastewater Sewage Sludge and Biosolids Treatment for Cyanobacteria and Cyanotoxins in Drinking Water at the Household Scale AIR QUALITY & CLIMATE Technologies and Tools to Monitor and Reduce Air Toxics Exposures Air Pollution Control Technologies for Small Sources HOMELAND SECURITY Scenario-Based Training for Disaster Response CIRCULAR ECONOMY/SUSTAINABLE MATERIALS Preventing and Recycling Food Waste Source Reduction and Reuse Lowering Embodied Carbon in the Built Environment