Desert communities that attract large numbers of visitors often cannot expand to serve them. The constraint is legal water supply, and it operates independently of how much building land exists.
Western water is allocated by prior appropriation
Much of the arid West allocates water by seniority, where the earliest established use holds the strongest claim and later users receive water only after it is satisfied.
These rights were largely established for agriculture and mining long before tourism became an economic force in the same valleys.
A new hotel or subdivision is therefore a very junior user, and in a dry year junior claims are the first to go unserved.
Development requires proving a supply
Many jurisdictions require a developer to demonstrate an assured water supply for a defined period before approval, rather than assuming the utility will find it.
Acquiring that supply usually means buying existing rights from another holder, since unclaimed water in these basins is rare or nonexistent.
The purchase price is effectively a cap on development, and it explains why building slows in places with obvious visitor demand.
Groundwater has its own limits
Where surface water is short, communities pump aquifers, and many desert aquifers recharge extremely slowly compared with the rate of withdrawal.
Sustained overdraft lowers the water table, raises pumping costs and in some areas causes the ground surface itself to subside.
Regulators respond with pumping limits and management areas, which returns the constraint to a legal one even where water physically exists underground.
Visitors use water differently than residents
Hotel occupancy, laundry, landscaping and pools concentrate demand into the same months when supply is lowest and evaporation is highest.
A town whose population multiplies seasonally has to size its treatment and delivery infrastructure for that peak, even though most of the year sits far below it.
This is why desert destinations often adopt seasonal restrictions and turf removal programs aimed specifically at outdoor use.
What a traveler can reasonably do
Water use in a hotel room is small compared with landscaping and recreation amenities, so choosing properties that have reduced turf and ornamental water features matters more than short showers.
Visiting outside the hottest months lowers both the town's peak demand and the individual's consumption, since heat drives much of the difference.
Understanding that the constraint is legal and seasonal rather than a matter of personal frugality is what makes those choices sensible rather than symbolic.