Regional perspective
The American West, basin by basin
A broad planning region requires local water budgets. Follow water from mountain precipitation to farms, communities, streams, and underground storage.
Read the regional briefAquaVault / Water security research
Water security starts with the whole system.
The American West depends on mountain snow, rivers, reservoirs, and the water stored beneath our feet. Across the nation, groundwater sustains farms, households, and public water systems.
Compare conservation, reuse, recharge, desalination, and other supply options by dependable water delivered, total cost, and regional fit.
Research for utilities, communities, planners, and water infrastructure decisions.
Regional context · National reliance
From mountain snow to water beneath our feet.
Water security requires dependable water at the right place, time, and quality. These briefs connect American West conditions and national groundwater reliance to a realistic comparison of conservation, reuse, storage, and additional supplies.
Research reviewed October 6, 2026
National reliance · Local evidence
Groundwater is more than an aquifer map
Aquifers are geological formations that store and transmit groundwater. Groundwater analysis evaluates the water itself: its availability, movement, quality, and response to withdrawals.
Read the groundwater analysisInvestment priorities · American West and United States
Build dependable water security from a measured portfolio
Start by repairing avoidable losses and reducing verified consumption. Compare reuse, recharge, and existing storage improvements next; add supply where a measured drought-year gap remains. The strongest portfolio depends on local water, infrastructure, rights, and affordability.
Read the options assessmentChoosing the right investment
Start with waste. Build for the remaining shortage.
The most efficient plan is a local portfolio. Screen avoidable consumption and water losses first, then compare the dependable yield of reuse, storage, and new supplies. These priorities guide appraisal; they do not establish a national cost ranking.
First screening step
Reduce verified losses and consumption
Audit leaks, household and industrial demand, and agricultural consumption. Measure net basin savings; less irrigation applied is not automatically more water available downstream.
Core local investments
Reuse water and improve storage
Compare treatment and reuse with reservoir operations and managed recharge. Reuse depends on wastewater availability; storage needs source water and cannot refill itself during drought.
Close the dependable supply gap
Add supply where it earns its cost
Evaluate desalination, transfers, and interconnections for remaining shortages. Cloud seeding and atmospheric harvesting have conditional roles and require measured local results.
Section 01
Aquifer risk scenarios
The legacy scenarios below illustrate aquifer-specific risk. Their timelines are model outputs, not measured exhaustion dates or a forecast for the whole American West. This research update does not rerun those models.
Section 02
Groundwater is national infrastructure
~39%
Groundwater share of U.S. public-supply withdrawals · USGS 2015 accounting
~48%
Groundwater share of U.S. irrigation withdrawals · USGS 2015 accounting
Nearly all
Self-supplied domestic water came from groundwater · USGS 2015 accounting
Historical water-use benchmarks, not new 2026 measurements. Read the national analysis and sources.
The charts below retain the existing aquifer scenario analysis. Regional groundwater availability also depends on recharge, quality, pumping, and groundwater–river exchanges.
Section 02b
Local wells reveal local conditions
Aquifer-wide averages can mask local drawdown and domestic-well vulnerability. Interpret the existing well map alongside its sampling coverage and thresholds; a site-level trend is not an aquifer-wide storage estimate.
Section 03
WHY THIS DECADE MATTERS
~20%
Colorado River flow decline since 2000 vs 20th-century baseline (measured context).
Major
Long-term groundwater depletion documented in key basins (measured).
Now
Modeled ROI strengthens as drought severity increases; delay raises downside exposure.
Establish the water budget
Measure withdrawals, recharge, storage, water quality, and river exchanges. Identify which communities and wells are most exposed when surface-water supplies contract.
Build a portfolio of responses
Start with avoidable losses and consumption, then compare reuse, recharge, storage, transfers, and desalination. Use verified usable supply and local operating constraints to decide what deserves investment.
Section 03b
1,200 YEARS OF MEGADROUGHT
Section 04
MEGADROUGHT TIMELINE
Megadrought timeline (probabilistic)
Uncertainty bands are presented deliberately to avoid false certainty. These are scenario probabilities, not deterministic forecasts.
2026-2035
P10 0.27%
P50 2.4%
P90 12.2%
Monte Carlo (50K paths)
2036-2045
P10 0.54%
P50 5.4%
P90 32.0%
Monte Carlo (50K paths)
2046-2055
P10 0.84%
P50 8.8%
P90 53.2%
Monte Carlo (50K paths)
These are legacy scenario probabilities with uncertainty bands, not deterministic forecasts. Model outputs for individual aquifers must not be extended to the entire American West. The new regional research evaluates connected water systems without assigning a new regional exhaustion date.
Section 05
Managed recharge within a wider water plan
Aquifer Storage and Recovery (ASR) stores appropriately treated water underground for later recovery. Managed aquifer recharge also includes infiltration methods. Suitable geology, source-water availability, treatment, permitting, and monitoring determine where each approach is viable; recharge complements demand management.
01
Capture
02
Treat
03
Inject
04
Store
05
Recover
CAPTURE WITH SAFEGUARDS
Diversions activate only when flow thresholds, environmental reserves, and legal water-right protections are all satisfied. Effects on downstream users and ecosystems require site-specific assessment and monitoring.
05-engineering-masterplan.md
TREATMENT BY RISK CLASS
Source water routes through tiered treatment trains - screening to advanced membrane barriers - based on quality class and aquifer vulnerability.
08-engineering-design-basis.md
INJECTION + MONITORING
Pressure-managed wellfields with sentinel monitoring wells and fail-closed shutdown interlocks. If anything deviates, the system stops automatically.
08-engineering-design-basis.md
Section 06
Regional water budget scenarios
This existing table is a planning scenario, not a measured regional groundwater budget. Additional precipitation is not credited as recharge or supply here. See the groundwater accounting framework.
Section 07
THE INVESTMENT CASE
Normal
$114B-$434B total program range
BCR: 0.49-1.46
Execution-sensitive in normal hydrology
Drought
$114B-$434B total program range
BCR: 1.07-3.92
Avoided-loss value dominates under shortages
Megadrought
$114B-$434B total program range
BCR: 4.06-9.44
Catastrophe-insurance economics become decisive
These are planning scenarios with cost and hydrology assumptions. They are not guaranteed returns or a valuation of the entire American West. The new research does not recalculate portfolio economics or establish a national ranking from the legacy ASR scenarios.
Section 08
25-YEAR BUILD PLAN
0-5 years
De-risk and prove performance
Pilot wellfields, permitting, monitoring backbone
5-12 years
Scale regional networks
Build capture-treatment-injection clusters and dispatch contracts
12-25 years
Harden national resilience
Inter-basin redundancy, strategic reserves, long-cycle renewal
Section 09
EVERY CLAIM IS TRACEABLE
The new research briefs link directly to independent research and public-agency guidance on groundwater and water supply options. Source dates and evidence limits are visible. Existing scenario datasets remain available with their assumptions.
Regional and groundwater research reviewed October 6, 2026 · Legacy model dates remain in their datasets
Provenance Rail
+ American West regional research+ National groundwater analysis+ U.S. water-security options and tradeoffs+ Provenance Registry+ Megadrought Probability Timeline+ Preparedness Phases+ Investment + Scenario ROI+ Why Now Stats + Caveats+ ROI Scenario Assumptions+ Capture Model Method+ Monitoring Wells Method
Section 10
WHO BUILDS THIS
Water Utilities
Engineering EPC
Institutional Capital
State Agencies
Water security requires coordinated local decisions.
Utilities, communities, engineers, and public agencies can connect monitoring to practical water management.
Section 11
SPREAD THE WORD
Ready to Act on the Data?
Whether you're a water utility evaluating risk, a state agency planning infrastructure, or an investor seeking resilient assets — the data is here.
Questions & evidence
Understanding the research
What does the American West research cover?
The western contiguous states and western Great Plains, evaluated through basin-specific snowpack, rivers, reservoirs, groundwater, and demand. Regional framing does not imply one depletion rate or forecast for every basin.
How is groundwater analysis different from an aquifer map?
An aquifer is a geological formation that stores and transmits groundwater. Groundwater analysis evaluates recharge, pumping, storage change, water quality, well reliability, and exchanges with streams and springs.
Which water-security options should come first?
Start by measuring the local shortage, fixing economical water losses, and reducing avoidable consumption. Then compare reuse, storage and recharge, agricultural changes, and additional supplies by their cost per dependable acre-foot. Desalination can provide reliable supply where alternatives are constrained; cloud seeding remains a conditional supplement. The best combination depends on the basin.
Can managed aquifer recharge solve every water shortage?
Recharge depends on suitable geology, available source water, quality, permitting, and operating constraints. A water-security plan should combine recharge with conservation, reuse, pumping management, and protection of connected surface water.
Are the site’s model results new regional forecasts?
No. Existing probabilities, timelines, and investment calculators are legacy planning scenarios. This update adds source-backed regional and groundwater research without rerunning those models. Their outputs should be interpreted within their documented geography and assumptions.