How much did wetlands loss raise US flood claims?

Wetlands loss boosted US flood insurance claim payouts by $10B

A new Nature Water study finds that losing wetlands across the United States has increased residential flood insurance claim payments by more than $10 billion.

The mechanism is straightforward: wetlands act as natural buffers that can absorb and slow floodwaters, helping reduce the intensity of inundation during heavy rain and storm surge. When those wetland areas are degraded or removed, communities are left more exposed to flooding.

The study ties the change in wetland extent to changes in the payouts made under the National Flood Insurance Program for residential claims. By comparing areas with differing levels of wetland loss, researchers estimated that the cumulative effect over time was large enough to be measured in billions of dollars.

What makes the result newsworthy is that it quantifies a benefit that is often discussed qualitatively—wetlands as flood protection—using a real-world economic outcome. Claim payments represent actual damages and restoration costs borne by insurers and policyholders, not just modeled flood depth changes.

The finding supports a growing policy argument for wetland restoration and protection as part of flood risk management, especially in areas where engineering alone may not be sufficient or cost-effective. It also suggests that conservation decisions today can translate into reduced financial losses in subsequent years.