Drought Risk in the US: How FEMA Scores It and How to Prepare

Written by Dvir · Data: FEMA National Risk Index v1.20 · Updated August 4, 2026

Drought is the slowest disaster in the National Risk Index — no sirens, no landfall, just rain that doesn’t come. It is also one of the most economically corrosive: the 2012 drought alone cost the US economy on the order of $30 billion, and the Southwest’s 2000–2022 megadrought was the region’s driest 22-year stretch in over a millennium. In the NRI, drought (hazard code DRGT) carries roughly $2.7 billion in national expected annual loss across 2,760 counties — and the losses concentrate where the crops are.

What counts as drought risk

The NRI’s drought hazard covers extended dry periods that stress water supplies and agriculture. Meteorologists distinguish several flavors that chain together: meteorological drought (precipitation deficit) becomes agricultural drought (soil moisture too low for crops) becomes hydrological drought (reservoirs, rivers, and aquifers depleted). The US Drought Monitor tracks all of this weekly on its D0–D4 scale.

Crucially, the NRI’s drought losses are overwhelmingly agricultural — crop and livestock losses, not urban property damage. That shapes the map: drought risk lives where irrigated, high-value agriculture depends on water that periodically fails. Drought is also a force multiplier for other NRI hazards — it cures fuels for wildfire and stresses the water systems cities depend on.

How the NRI measures it

FEMA combines each county’s agricultural exposure (crop and livestock value), annualized drought frequency from Drought Monitor records, and historic loss ratios (heavily informed by USDA crop-insurance loss data) into an Expected Annual Loss scored 0–100 against all counties. Counties with little agriculture can rate low even in chronically dry regions — the index measures dollars at stake, not aridity.

Where the risk concentrates

The ranking reads like a map of America’s produce aisle. Fresno County, CA leads the nation (score 100, ~$223M expected annual loss) — the most agriculturally productive county in the US, drawing on the over-allocated San Joaquin Valley water system. The rest of the top five is all Central Valley and Central Coast California: Monterey (~$81M — the “Salad Bowl of the World”), San Joaquin, Merced, and Madera counties, each recording drought conditions 70–95 times per year on average in the underlying data. High ratings continue through the High Plains wheat and cattle belt (Kansas, Nebraska, Texas Panhandle) and the Colorado River basin states.

How to read your county’s score

If your county rates High or Very High, the exposure is probably economic rather than personal safety: farm income, ranch feed costs, rural water systems, and — indirectly — wildfire danger. For households, the practical questions are: Does your water come from a small rural system or private well vulnerable to depletion? (Well failures spike in drought years; deepening a well costs tens of thousands.) Are you in a region with mandatory-restriction history? For farmers and ranchers, drought risk is fundamentally an insurance and water-rights question.

What actually reduces the risk

  • For farms: insure and diversify. Federal crop insurance and the USDA’s disaster programs (LFP for grazing losses, ELAP) are the backstop that turns a lost season into a survivable one. Soil-health practices — cover cropping, reduced tillage — measurably improve moisture retention.
  • Irrigation efficiency is the big lever: drip and micro-irrigation, soil-moisture monitoring, and deficit-irrigation scheduling stretch allocations through dry years.
  • For well owners: know your well depth and static water level, and monitor them; falling levels give years of warning before failure.
  • For households: outdoor watering is typically half of residential summer use — drought-tolerant landscaping and drip systems are the durable fix, and many western utilities pay rebates for turf removal.
  • For communities: diversified supply (storage, groundwater banking, recycled water) is what separates cities that ride out droughts from those that hit day-zero scares.

The droughts that reshaped American policy

The Dust Bowl (1930s). A multi-year drought across the southern Plains, compounded by deep plowing that destroyed the native sod, stripped topsoil from millions of acres and drove hundreds of thousands of people off the land. The federal response created institutions that still exist: the Soil Conservation Service (now the Natural Resources Conservation Service), the shelterbelt tree-planting programs, and the entire concept of federally supported soil conservation practice. Nearly every modern conversation about cover crops and reduced tillage descends from it.

The 1950s southern Plains drought was in some respects more severe meteorologically than the 1930s but caused far less soil loss, because the conservation practices had taken hold. It is the clearest natural experiment demonstrating that drought damage is substantially a function of land management, not just rainfall. It also drove the construction of much of the region’s reservoir and water-transfer infrastructure.

The 1988 and 2012 droughts were the two costliest single-year US droughts in modern records, each causing tens of billions of dollars in agricultural losses and, in 2012, cutting the national corn yield sharply enough to move global food prices. The 2012 event pushed the US Drought Monitor from a useful map into the trigger mechanism for federal disaster designations — Drought Monitor status now automatically triggers certain USDA assistance.

The Southwest megadrought (roughly 2000–2022) was, according to tree-ring reconstructions, the driest 22-year period in the region in over 1,200 years. It drove Lake Mead and Lake Powell to record lows, triggered the first-ever federal shortage declarations on the Colorado River, and forced negotiated cuts among the seven basin states — the first serious test of the 1922 Colorado River Compact’s assumption of a wetter river than actually exists.

California’s 2012–2016 and 2020–2022 droughts produced statewide mandatory urban restrictions, thousands of dry domestic wells in the San Joaquin Valley, measurable land subsidence from groundwater over-pumping, and the Sustainable Groundwater Management Act — California’s first comprehensive attempt to regulate groundwater, a resource that had been essentially unmanaged for a century.

Season, types, and the geography of loss

Drought does not have a season so much as a development curve. It begins as a precipitation deficit, becomes a soil-moisture deficit weeks to months later, and becomes a reservoir and aquifer deficit months to years after that. Recovery runs in reverse and takes far longer than onset.

  • Meteorological drought — precipitation below normal for a sustained period. Weeks to months.
  • Agricultural drought — soil moisture insufficient for crops at a critical growth stage. This is where most NRI drought loss originates, and timing matters more than total: a three-week dry spell during corn pollination costs more than a dry autumn.
  • Hydrological drought — depleted streamflow, reservoirs, and groundwater. Months to years, and the one that produces water restrictions and rights curtailments.
  • Flash drought — a rapid-onset variety driven by extreme heat and wind that desiccates soil within weeks rather than months. The 2012 and 2017 northern Plains events were flash droughts, and they are a growing share of the problem because their speed defeats normal irrigation and forage planning.

Geographically, the US Drought Monitor’s D0–D4 scale is the operative currency, and the loss map follows irrigated, high-value agriculture on stressed water systems: California’s Central Valley and Central Coast, the High Plains from the Texas Panhandle through Kansas and Nebraska where the Ogallala Aquifer is being drawn down faster than it recharges, the Colorado River basin states, and the Pacific Northwest’s Columbia basin. The Southeast and Midwest have their own droughts, but rainfed agriculture and abundant surface water make their per-event losses lower.

Drought is also the great multiplier hazard in this index. It cures fuels for wildfire, hardens soils so that the rain that finally arrives runs off and floods, kills trees that then fall in windstorms, and concentrates contaminants in shrinking water supplies.

What actually reduces drought loss

For farms and ranches:

  • Soil health is the durable lever. Cover cropping, reduced or no-till practice, and residue retention measurably increase infiltration and water-holding capacity. The 1950s comparison to the 1930s is the historical proof; NRCS field trials are the contemporary version. NRCS EQIP and CSP programs cost-share this work.
  • Irrigation efficiency. Drip and micro-irrigation, low-elevation spray application on pivots, soil-moisture sensors, and deficit-irrigation scheduling stretch a limited allocation across a season. Note the caveat: efficiency alone often expands irrigated acreage rather than reducing basin water use, so it must be paired with allocation limits to help the aquifer.
  • Crop and variety selection. Shorter-season and drought-tolerant varieties, and shifting acreage toward lower-water crops, are the adjustments that keep a bad year survivable. Permanent plantings — almonds, pistachios, vineyards — remove that flexibility entirely, which is why perennial-heavy regions carry the highest drought exposure.
  • Forage and herd planning. Ranchers who pre-plan destocking triggers and secure alternative forage early do far better than those who wait; feed costs spike exactly when everyone needs feed.

For well owners and rural water systems:

  • Know your well’s depth, static water level, and pump setting, and check the level annually. Declining levels give years of warning, and a dry well is a five-figure emergency when every driller in the county is booked.
  • Rural systems should plan interconnections and backup sources before a shortage, not during one.

For households and communities:

  • Outdoor irrigation is typically half or more of residential summer use. Turf replacement, drip irrigation, and drought-tolerant landscaping are the durable fix, and most western utilities offer rebates that cover a large share of the cost.
  • Indoor efficiency compounds: high-efficiency fixtures and appliances, and finding leaks, which waste a remarkable share of residential supply.
  • Supply diversification is what separates cities that ride out droughts from those with “day zero” scares: storage, groundwater banking, recycled water, stormwater capture, and in coastal areas desalination. These are municipal decisions with decade-long lead times.

Insurance and assistance

Drought is unusual: for most households there is no insurable property loss, and for farms the assistance system is elaborate.

  • Federal crop insurance (through USDA’s Risk Management Agency and private agents) is the primary backstop. Sales closing dates fall months before planting, so the decision is made long before anyone knows what the weather will do.
  • Noninsured Crop Disaster Assistance (NAP) covers crops for which federal crop insurance is unavailable — important for specialty and diversified operations.
  • Livestock Forage Disaster Program (LFP) pays grazing losses and triggers automatically off US Drought Monitor status for the county, which is why the weekly map matters financially. ELAP covers additional feed and water-hauling costs.
  • Emergency loans and conservation cost-share are available through FSA and NRCS in counties with a Secretarial disaster designation.
  • Homeowners insurance does not cover drought — but it may cover the consequences. Foundation and structural damage from soil shrinkage in expansive clay soils is a real and expensive drought loss in Texas and the Plains, and is usually excluded; check your policy and consider foundation watering during extended dry spells, which is a genuine and cheap mitigation in clay-soil regions.
  • Dry domestic wells are typically not an insured loss and not covered by FEMA individual assistance. Some states run emergency drinking-water and well-replacement programs; California’s is the largest.

Before, during, and after

Before. Watch the US Drought Monitor weekly and NOAA’s seasonal outlooks — this is the one hazard in the index with months of warning built into the public data. Make crop insurance and destocking decisions on the calendar, not on the forecast. Fix leaks and convert landscaping in wet years, when rebates are available and contractors are not booked.

During. Follow the restriction tiers your utility publishes and take voluntary ones seriously — voluntary conservation early is what prevents mandatory rationing later. Farmers should track the Drought Monitor designation for their county specifically, since USDA program eligibility keys off it. Well owners should monitor water level and be alert to sand or air in the line, which signals a dropping water table. Everyone in the West should treat drought as an active wildfire warning: cured fuels, low humidity, and extended fire seasons are the direct consequence.

After. Drought recovery is slow and uneven — soil moisture may recover in a season while reservoirs and aquifers take years, and a single wet winter does not end a hydrological drought. Use the recovery window to do the mitigation that is impossible mid-crisis: deepen or replace marginal wells, rebuild soil organic matter, replace turf, and renegotiate water arrangements. And expect the first heavy rains on hardened, denuded ground to run off rather than infiltrate — post-drought flooding and debris flows are a routine sequel, not an irony.

Sources

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