Storm Water Grant Program (SWGP) - Proposition 4
Forecasted
Storm Water Grant Program (SWGP) - Proposition 4 supports urban stormwater project teams with planning and implementation funding to reduce flooding while improving water supply or water quality.
Funder: California State Water Resources Control Board
Due Dates (Anticipated): December 2026 (Application deadline)
Funding Amounts: $200,000–$750,000 for planning; $1 million–$15 million for implementation
Summary: Funds planning and implementation of multi-benefit urban stormwater projects that reduce flooding and improve water supply or water quality.
Key Information: Research-only projects are ineligible.
Description
The California State Water Resources Control Board’s Division of Financial Assistance administers this program using funds from Proposition 4, the bond act approved by California voters in 2024. It supports projects that address flooding in urbanized areas while providing a water supply or water quality benefit. Eligible approaches include stormwater capture and reuse, recharge, low-impact development, urban stream and watershed restoration, debris flow mitigation, and permeable surfaces. Nature-based infrastructure receives preference.
Applicants may seek a project-specific planning grant for work such as feasibility studies, design, environmental documents, and other preparation for implementation. Implementation grants may also include planning and design when the full project can be completed within the funding period.
