The Ogallala Aquifer Is Running Out. What That Means for the Farmers Who Depend on It

The Ogallala Aquifer stretches beneath eight states, from South Dakota to Texas, and it is the backbone of irrigated farming across the High Plains. It supplies roughly 30% of all irrigation water used in the United States and underwrites an estimated $35 billion in crop production every year -- mostly corn, wheat, sorghum, and cotton. More than half of all US farm irrigation water comes from underground aquifers, and none matters more than this one.

America's Largest Groundwater Supply Is Vanishing

Farmers have been pulling water out of the Ogallala faster than rain and snow can recharge it for more than a century. Between 1900 and 2008 alone, an estimated 89 trillion gallons were drained from the aquifer -- roughly two-thirds the volume of Lake Erie. In much of the aquifer's footprint, recharge happens at a fraction of an inch per year, while irrigation can draw down several feet in a single dry season.

Part of the problem is structural. Decades of farm policy -- crop insurance and subsidy programs that reward planting irrigated, water-intensive crops -- have historically made pumping more water the economically rational choice for an individual farmer, even when the aggregate effect across thousands of wells is a falling regional water table that eventually threatens everyone drawing from it.

The Driest Start to a Year on Record

2026 has made the underlying math worse. The first three months of the year were the driest first quarter in US recorded history, which means farmers across the Plains are irrigating more than ever this season, right when the aquifer can least afford the extra draw. Dry soil at planting increases irrigation demand for the entire growing season that follows, not just the weeks when rain is missing.

The depletion is not uniform. In parts of western Kansas and the Texas Panhandle, the water table has already dropped enough that some center-pivot systems can no longer deliver full irrigation rates, and a number of farmers have converted formerly irrigated acres back to dryland farming or reduced the number of acres they plant to water-intensive crops in a given year.

The Cost of Chasing the Water Table Down

As the water table drops, the fix is not free. Farmers facing weaker well output have to drill deeper to reach water that still exists further down, and a new or deepened well can cost tens of thousands of dollars -- a bill that lands hardest on smaller operations, and one that is especially hard to justify for farms already carrying record debt loads in 2026.

The economic stakes extend beyond any single farm. Because the aquifer underwrites $35 billion in annual crop production, sustained depletion threatens regional food and feed supply chains well beyond the farms doing the pumping -- a slow-moving risk that shows up in commodity markets and food prices long after the individual well runs low.

• The Ogallala Aquifer underlies eight states from South Dakota to Texas and supplies roughly 30% of all irrigation water used in the United States
• It underwrites about $35 billion in crop production each year, mostly corn, wheat, sorghum, and cotton across the High Plains
• Farmers withdrew an estimated 89 trillion gallons between 1900 and 2008, and withdrawals continue to outpace natural recharge across most of the aquifer's footprint
• Parts of western Kansas and the Texas Panhandle have already seen wells lose enough pressure that center-pivot systems can't deliver full rates, pushing some acres back to dryland farming
• The first three months of 2026 were the driest start to a year in US recorded history, increasing irrigation demand at the exact moment the aquifer needs relief

Farming a Shrinking Resource

Adaptation is already underway on the ground. Some farmers are shifting acres to less water-intensive crops such as sorghum instead of corn. Others are installing soil moisture sensors and variable-rate irrigation systems that apply water by zone instead of running every pivot on a fixed schedule. Satellite-based crop stress detection adds another layer: it flags exactly which parts of a field are water-stressed before the crop shows visible damage, letting a farmer target irrigation to the acres and growth stages that actually need it, rather than blanket-watering an entire field out of caution.