As we reflect on 2024 and move into 2025, the Washington Stormwater Center (WSC) remains committed to advancing innovative, science-based solutions that protect water quality and support resilient communities across Washington State. Throughout 2024, the WSC expanded its impact across a range of focus areas—from certifying stormwater technologies and supporting permit implementation to strengthening environmental justice efforts and facilitating regional collaboration. Our work has been guided by a commitment to practical, research-driven outcomes and a focus on building capacity for municipal stormwater programs. With each project, training, and partnership, we continue to respond to the evolving environmental and regulatory landscape with clarity, collaboration, and action. This report highlights key accomplishments from the past year while also outlining the initiatives that will shape our work in 2025. As we prepare to implement new permit requirements, support national alignment through programs like STEPP, and deepen integration across public health, land use, and stormwater planning, our focus remains on delivering real-world solutions that serve communities across the state. The strength of the Washington Stormwater Center lies in its people. Our team of researchers, engineers, permit specialists, educators, designers, and communicators brings together diverse expertise to ensure our programs are thoughtful, responsive, and grounded in both science and service. This collaborative, interdisciplinary approach is reflected throughout the pages of this report. Thank you to our partners, stakeholders, and the broader stormwater community for your continued support. Together, we are making lasting progress toward clean water, healthy ecosystems, and sustainable communities—now and for the future