One-fourth of the United States' "critical" infrastructure is at risk of flooding, a new report released Monday morning warns.

The report pinpoints the nation's flood risk to critical infrastructure, such as utilities, airports, ports and emergency services like police, fire, and hospitals, in addition to residential properties, commercial properties, streets and local roads, and social infrastructure like schools and government buildings.

"Our work aims to determine the amount of flooding that would render infrastructure either inoperable or inaccessible," said Jeremy Porter of the First Street Foundation, which prepared the report.

First Street Foundation is a Brooklyn-based nonprofit research and technology group that works to define America’s flood risk.

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In fact, according to the National Oceanic and Atmospheric Administration, flooding is the most expensive natural disaster in the United States, and has cost the nation more than $1 trillion in inflation-adjusted dollars since 1980. 

The report, titled "The Third National Flood Risk Assessment: Infrastructure on the Brink," took into account all types of floods, including slow-motion river flooding, fast-moving flash flooding, along with coastal flooding and storm surge from the ocean.