Storm Water Grant Program (SWGP) - Proposition 4
Forecasted
Storm Water Grant Program (SWGP) - Proposition 4 supports California agencies, nonprofits, utilities, and tribes with urban runoff projects that improve water quality and put runoff to beneficial use.
Funder: California State Water Resources Control Board
Due Dates (Anticipated): January 2027 (Full application deadline)
Funding Amounts: $110 million in total grant funding
Summary: Supports multi-benefit urban storm water management projects in California that improve water quality and beneficially use runoff.
Key Information: Storm water and dry-weather runoff capture projects require a Storm Water Resource Plan and State Water Board concurrence review.
Description
The Storm Water Grant Program – Proposition 4 is administered by the California State Water Resources Control Board through its Division of Financial Assistance. It funds multi-benefit urban storm water management projects under Proposition 4, the Safe Drinking Water, Wildfire Prevention, Drought Preparedness, and Clean Air Bond Act of 2024, approved by California voters in November 2024.
The program promotes storm water and dry-weather runoff as valuable resources while improving water quality. Its broader goals include groundwater recharge, reuse for domestic purposes, support for watershed processes, and community benefits such as habitat and open space. Storm water resource planning encourages projects to maximize water supply, water quality, flood management, environmental, and other community benefits within a watershed.
