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Are There Grants for Installing Rainwater Cisterns?

April 5, 2026

Quick Answer

Yes, there are grants available for installing rainwater cisterns, primarily through government agencies and non-profit organizations, which support water conservation and sustainability initiatives.

Eligible Applicants and Funding Sources

Many government agencies and non-profit organizations provide grants for rainwater harvesting projects, including the US Department of Agriculture (USDA), the Environmental Protection Agency (EPA), and the National Oceanic and Atmospheric Administration (NOAA). For example, the USDA’s Rural Energy for America Program (REAP) offers grants and loans for renewable energy and water conservation projects, including rainwater harvesting systems. Additionally, organizations like the Rainwater Harvesting Association and the American Rainwater Catchment Systems Association offer resources and grants for implementing rainwater harvesting systems.

Water Cistern Sizing and Design Considerations

Proper cistern sizing is crucial for effective rainwater harvesting. A good rule of thumb is to size the cistern to hold at least 1 inch of rainfall from the roof area. For example, if a building’s roof area is 1,000 square feet, a 1-inch rainfall would yield approximately 650 gallons of water. When designing a cistern, consider factors such as roof material, gutter size, and downspout location to ensure optimal water collection and storage. It’s also essential to ensure the cistern is properly connected to the roof and is equipped with a first flush device to remove debris and contaminants from the roof runoff.

Cistern Grant Application and Approval Process

When applying for grants for rainwater cisterns, it’s essential to provide detailed project plans, including cistern sizing and design specifications, as well as a budget and timeline. Grant applications typically require documentation of the project’s water conservation benefits, such as reduced water bills and increased water availability. The approval process typically involves reviewing the application, assessing the project’s feasibility, and conducting site visits or inspections to ensure compliance with grant requirements.

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