Utah law and Utah County maps behind a Provo valuation
January 1 is the county's date, not the estate's or the court's
Section 59-2-303.1 of the Utah Code has the Utah County Assessor update every value each year through a computer-assisted mass appraisal system and review each parcel's characteristics in detail at least once every five years. Section 59-2-103(2) makes fair market value on January 1 the basis of the tax, except where another law says otherwise, and section 59-2-102(13) describes that value as the price on which a buyer and a seller, both acting willingly, neither forced and both reasonably informed, would agree. For tax purposes the same subsection measures it under the zoning in force, unless a zoning change in that tax year is reasonably probable and would appreciably affect value. Section 59-2-103(3) then allows residential property an exemption that takes 45 percent off its value, the residential exemption, and section 59-2-102(35) defines residential property, for that reduction, as property used for residential purposes as a primary residence. The Assessor's own example shows a home with a market value of $348,300 taxed on $191,565. A change of owner brings the exemption up again under section 59-2-103.5. In the version in force today the Assessor mails the new owner a Residential Property Declaration, due within 90 days of the mailing, unless the home's address matches the owner's or tenant's mailing, driver license or voter registration address; in the version that takes effect on January 1, 2027, the owner instead files an application with the county board of equalization after the ownership changes. An owner who disputes the value applies to the county board of equalization by September 15 or within 45 days counting the day of the Auditor's notice, whichever is later, and section 59-2-1004 requires the application to carry the owner's own estimate of fair market value. None of these figures is a value on the day a Provo homeowner died or on the day a Utah County divorce decree was entered.
Opening a Provo estate in the Fourth District Court
The Utah Uniform Probate Code fixes where an estate begins. Section 75-3-201 places the first informal or formal testacy or appointment proceeding in the county where the decedent was domiciled at death, so the estate of a Provo resident is opened in Utah County, at the Fourth District Court's Provo courthouse described above. The personal representative's inventory duty sits in section 75-3-705, titled inventory and appraisement: within three months after appointment, and with exceptions for a special administrator and for a successor whose predecessor already did it, list what the decedent owned, with each item's fair market value as of the date of death. Section 75-3-706, titled employment of appraisers, lets the representative bring in a qualified, disinterested appraiser to help find the date-of-death value of an asset when that value is reasonably in doubt. Section 75-3-707 is the supplementary inventory: when property comes to light later, or a value or description in the first inventory proves erroneous or misleading, the representative prepares a supplementary inventory or appraisement showing the market value as of the date of death. What sections 75-3-705 and 75-3-706 ask of a representative is set out on this site's probate valuations page.
A Utah County divorce and the date of value
Utah's divorce statutes moved into Title 81, the Utah Domestic Relations Code, in a chapter effective September 1, 2024. Former section 30-3-5 has no current version; the Legislature's recodification index sends its subsection (2) to section 81-4-406(4). Section 81-4-406(4)(c) lets the court write into a divorce decree the orders about the couple's property, debts and obligations that it finds equitable. The statute names no date on which a house is valued; that comes from the courts. In Dahl v. Dahl, 2015 UT 23, an appeal from the Fourth District's Provo department, the Utah Supreme Court called it well settled that assets are valued at the time of the divorce decree. The Utah Court of Appeals, in Marroquin v. Marroquin, 2019 UT App 38, repeated the exception: where one party has dissipated an asset, hidden its value or otherwise acted obstructively, the trial court may value it at another time, such as separation. Section 81-4-402 allows a petition in Utah County when either spouse has actually and genuinely lived in the county for at least 90 days before filing, and it lists two other bases as well.
The Wasatch fault, Y Mountain and the east bench
Provo's foothills sit within the Wasatch Fault zone, says the city's Hillsides and Canyons Plan, adopted on December 12, 2023. The Utah Geological Survey has trenched the fault's Provo segment at the mouth of Rock Canyon. A 2016 report by the Working Group on Utah Earthquake Probabilities, which the Survey published, gives the segment a length of 59 kilometers, puts its most recent surface-faulting earthquake about 600 years ago, and sets the chance of one or more earthquakes of magnitude 6.75 or larger in the Wasatch Front region within 50 years at 43 percent. The plan's hazard map shows fault lines, a fault buffer, debris-flow areas and surface-fault-rupture areas, and it recommends third-party review for properties within 100 feet of the fault; that is a plan recommendation, not a section of the city code. The code does carry a Critical Hillside overlay zone, which it says exists to protect the sensitive hillside areas of the east bench. The 2005 and 2009 Y Mountain rock falls noted under Oak Hills came from limestone cliffs on the mountain's west face. Between 1988 and 1995 the Survey and the county hazards geologists mapped special-study areas for urban Utah County, marking where studies of fault rupture, landslides and debris flows are recommended before development. Maps like these say where to look closer; they do not value a house or settle whether one lot is affected.
Utah Lake, the Provo River and the June 2026 flood maps
New flood maps for Utah County took effect on June 23, 2026. FEMA's final notice in the Federal Register of May 7, 2026 lists Provo among the Utah County communities whose flood hazard determinations were made final, and the Utah Department of Public Safety's notice for an August 2024 open house on the new maps said they reflect updated flood risk along the Provo River and the Utah Lake shoreline. Provo's copy of the maps is kept at Public Works, 1377 South 350 East. On June 9, 2026 the Provo Municipal Council approved Ordinance 2026-17, amending the city's floodplain management and development standards; a planning report in May had warned that without new standards by June 23 Provo would lose eligibility for the National Flood Insurance Program. In the southwest the city's plan adds a Provo River floodplain, a Utah Lake floodplain and a high water table, as the Sunset and Lakewood note describes. Liquefaction is a separate, earthquake-driven hazard. The Survey's 1994 liquefaction-potential map for part of Utah County grades ground from very low to high, where high means a 50 percent chance within 100 years of shaking strong enough to liquefy it, and the Survey finds the most susceptible soils generally along rivers, streams and lake shorelines. Because the maps changed this year, an appraisal with an effective date before June 23, 2026 and one dated after it can cite different flood maps for the same lot.
What these rules do not decide
A caution about everything above. The assessment statutes describe how Utah County taxes property. The probate code lists what a personal representative reports and allows that person to hire help. The divorce code leaves orders about property to the judge's sense of what is equitable. The fault, rock-fall and flood maps guide building and insurance. Read as written, not one of these provisions makes a private appraisal mandatory for a Provo estate, a divorce or a tax return; whether a particular matter calls for one is a question for the family's Utah attorney, accountant or tax adviser. Each kind of request has its own page on this site: values for a Utah probate inventory, a house in a Utah County divorce, estate and trust appraisals and a date-of-death value for the federal step-up in basis. What an appraisal costs here is covered in the post on Provo appraisal fees for 2025 and 2026.