Stormwater finance is the process of securing and managing funding for projects aimed at mitigating the negative impacts of stormwater runoff. Traditional infrastructure and land development significantly alter natural drainage patterns, leading to increased runoff volume and pollutant load. This, in turn, contributes to flooding, erosion, water quality degradation, and habitat loss. Therefore, effective stormwater management is crucial, requiring substantial financial investment. Traditionally, stormwater management has been funded through general tax revenues. However, as infrastructure ages, populations grow, and regulations become stricter, reliance on general funds becomes insufficient. Dedicated funding mechanisms are increasingly necessary to ensure sustainable and reliable financial resources. One prevalent approach is the implementation of stormwater utilities. These utilities operate similarly to water or sewer utilities, charging fees based on a property’s contribution to stormwater runoff. Typically, fees are calculated based on the amount of impervious surface (e.g., rooftops, driveways) on a property. This approach provides a dedicated revenue stream directly linked to the service provided, making funding more predictable and equitable. Properties with larger impervious areas, contributing more to runoff, pay higher fees. Credits or reductions in fees can be offered for properties that implement best management practices (BMPs) on-site, incentivizing private-sector investment in stormwater control. Another important funding source is impact fees. These are one-time charges levied on new development to offset the cost of stormwater infrastructure improvements required to accommodate the increased runoff generated by the development. Impact fees help ensure that new growth contributes its fair share to the costs of managing stormwater. Grants from federal, state, and local government agencies represent another significant avenue for stormwater finance. These grants often target specific projects or areas with critical needs, such as addressing combined sewer overflows (CSOs) or improving water quality in impaired waterways. Securing grant funding can be highly competitive, requiring detailed project proposals and a demonstration of measurable environmental benefits. Beyond these established methods, innovative finance mechanisms are emerging. Environmental Impact Bonds (EIBs) are one such example. EIBs are a type of pay-for-success financing model where investors provide upfront capital for green infrastructure projects. Repayment to investors is contingent on the project achieving predetermined environmental outcomes, such as reduced stormwater runoff volume or improved water quality. Public-private partnerships (PPPs) represent another promising approach. PPPs can leverage private sector expertise and capital to design, build, finance, operate, and maintain stormwater infrastructure. This model can alleviate the financial burden on municipalities and accelerate project delivery. Effective stormwater finance requires careful planning and transparent communication with stakeholders. A comprehensive stormwater management plan should identify priority projects, estimate costs, and outline funding strategies. Public engagement is essential to build support for proposed funding mechanisms and ensure that investments are aligned with community needs and values. Ultimately, a diverse and sustainable funding portfolio is essential to effectively manage stormwater and protect our water resources.