Environmental

The Arizona 'Underground Storage Tank' (UST) program is important for real estate because:

AAll Arizona properties are required to have underground water storage tanks
BLeaking USTs (commonly from gas stations and older homes with fuel oil tanks) can contaminate soil and groundwater, creating significant liability and disclosure obligations for property owners and sellers✓ Correct
CUnderground storage is required for all properties in flood zones
DUSTs provide property tax exemptions for commercial properties

Explanation

Leaking underground storage tanks (LUSTs) are a major source of soil and groundwater contamination. Gas stations, dry cleaners, and older properties may have USTs.

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