Sea levels along the U.S. coastline are rising at a much faster pace than they did in the past, and new research shows that the acceleration is unmistakable. A study published in AGU Advances finds that the rate of sea level rise along the contiguous United States has more than doubled over the past century. The findings directly contradict recent claims that U.S. sea levels are rising steadily but not accelerating. Those claims were made in a July 2025 report by the U.S. Department of Energy, which argued that tide gauge data showed no meaningful increase beyond long-term averages. The new research, however, shows that conclusion rests on an incomplete reading of the evidence.

Sea level changes are tracked using tide gauges, which measure how the ocean rises relative to the land. While some gauges have records stretching back more than a century, individual locations can be misleading. Land subsidence, geological uplift, storms, and ocean circulation patterns can all distort local readings. To overcome these limitations, physical oceanographer Chris Piecuch of Woods Hole Oceanographic Institution analyzed data from 70 tide gauges distributed along the U.S. coast, each with more than 30 years of observations. By aggregating the full dataset, the analysis filtered out local noise and revealed the national trend.

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The results show a sharp change over time. Around 1900, U.S. coastal sea levels were rising at less than 2 millimeters per year. By 2024, that rate had climbed to more than 4 millimeters per year. In total, U.S. coastal sea levels have risen by roughly 40 centimeters, or about 16 inches, over the last 125 years. Importantly, the current pace is well above the historical average, confirming that sea level rise is speeding up rather than remaining constant.

The Department of Energy analysis relied on just five tide gauge sites, several of which are heavily influenced by local land motion. Locations such as Grand Isle, Louisiana, and Galveston, Texas experience significant subsidence due to sediment processes and historical oil and gas extraction. While these local effects matter for regional planning, they do not explain nationwide acceleration. When all long-term tide gauges are considered together, the upward trend becomes clear. As Piecuch notes, land motion tends to be gradual and steady over long periods. It cannot account for the widespread increase in sea level rise rates observed across the entire coastline.

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The accelerating rise aligns closely with global patterns driven by warming oceans and continued ice loss from glaciers and ice sheets. These climate-related factors provide a coherent explanation for why sea levels are rising faster today than in the early 20th century. Focusing on a small, selective subset of data obscures this reality. When the full observational record is examined, the conclusion is clear: U.S. coastal sea level rise is accelerating.

As sea levels rise more quickly, coastal flooding begins from an increasingly higher baseline. High tides now reach farther inland, storms cause greater damage, and infrastructure faces more frequent disruption. Roadways flood more often, homes experience repeated water intrusion, wetlands lose ground, and freshwater supplies face growing pressure from saltwater intrusion. The acceleration documented in this study suggests these challenges will intensify unless emissions and adaptation efforts keep pace. In short, the science shows that sea level rise along the U.S. coast is not only continuing, it is speeding up.

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