This toolkit was developed to support state and local advocates interested in water infrastructure investment who are seeking to better understand the State Revolving Fund (SRF) process. Nonprofit and community-based water advocates have an opportunity to influence how new and recurring federal water infrastructure funds are distributed and to reform how SRF programs operate. This toolkit aims to build the capacity of advocates to influence, improve, and access the process of securing funding for communities who need it most and have historically not been able to access SRF dollars. The toolkit strives to be accessible to newcomers to this issue, providing background information on how SRFs work and actionable ideas for how to participate in SRF processes and advocacy.