Authority & Powers of the Idaho County Commissioner

Understanding the delegated and enumerated powers granted to county commissioners under Idaho law, and the critical constitutional limits on those powers.

Enumerated Powers Under Idaho Code Title 31

County commissioners operate under a fundamental legal principle: they possess only those powers that have been explicitly granted to them by the Idaho Legislature. This is not a matter of interpretation or assumption. Unlike state governments, which retain all powers not delegated to the federal government, local governments in Idaho possess only the powers that statute has affirmatively granted. This principle is sometimes called the "Dillon's Rule" doctrine, though Idaho applies it with particular strictness to county authority.^[1]

The primary source of county authority is Idaho Code Title 31, which systematically enumerates the powers of county commissioners. These are not suggested authorities or advisory guidelines—they are the outer boundary of legal action. If a power is not listed in Title 31, commissioners do not possess it, regardless of how reasonable, efficient, or popular the proposed action might be.

Idaho Code § 31-701 establishes the foundational grant of power: county commissioners shall have the management and control of the county, including its finances, property, and concerns.^[2] However, this broad language is immediately qualified by the requirement that commissioners exercise only those specific powers detailed in subsequent statutes. The apparent generality of § 31-701 is thus substantially constrained by the enumerated list that follows.

The enumerated powers include, but are not limited to:

• Taxation authority — Levy property taxes within statutory caps and adopt budgets (Idaho Code §§ 63-802, 31-706)^[3]
• Bonding and indebtedness — Issue bonds and incur debt subject to voter approval and constitutional limits (Idaho Code § 31-710)^[4]
• Land use authority — Adopt comprehensive plans, zoning ordinances, and subdivision regulations (Idaho Code Title 67, Ch. 65)^[5]
• Road and bridge maintenance — Establish, maintain, and improve county roads and bridges (Idaho Code § 31-801 et seq.)
• Building and facilities — Acquire, construct, and maintain county buildings and facilities (Idaho Code § 31-704)
• Contract authority — Enter into contracts necessary for county operations, subject to public bidding requirements (Idaho Code § 67-2805)
• Ordinance power — Adopt ordinances on subjects authorized by statute (Idaho Code § 31-714)^[6]
• Fee authority — Collect specified fees authorized by statute (Idaho Code § 31-808 et seq.)
• Intergovernmental agreements — Enter into agreements with other governmental entities (Idaho Code § 67-3401 et seq.)

The critical insight is this: each of these powers is a delegation from the state legislature, not an inherent county right. The Legislature granted these powers to counties as a matter of policy convenience and local control, but the Legislature retains the authority to modify, restrict, or revoke any of them. Commissioners who forget this distinction often find themselves exceeding their authority.

The Power to Tax: Property Tax Authority & Constraints

Of all enumerated county powers, the power to tax is simultaneously the most important, the most regulated, and the most dangerous to property rights. Counties cannot create or levy a tax on any subject matter unless the Idaho Legislature has first authorized that specific tax. Counties cannot, for example, levy a sales tax, an income tax, a business license tax, or a transaction tax—no matter how reasonable or how much revenue it would generate—because the Legislature has not delegated such authority.^[7]

The principal tax county commissioners may levy is the ad valorem property tax, authorized under Idaho Code § 63-802. This power comes with substantial, though imperfectly enforced, constraints.

Property Tax Levy Mechanics

Each year, county commissioners adopt a budget that must be balanced. The revenue side of the budget consists of existing property tax revenue plus any new levy amount the commissioners authorize. However, commissioners cannot arbitrarily increase property tax revenue year to year. Idaho Code § 63-802 imposes what is commonly called the "3% budget growth cap," though this phrase understates both the power of the limit and the substantial exceptions built into it.

The rule is this: A county's total budget may grow no more than 3% annually, adjusted for the prior year's actual spending, without voter approval.^[8] However, this 3% cap has multiple loopholes:

• New construction exception — All tax revenue derived from new buildings and improvements (added assessed value) is exempt from the 3% cap and may be collected without limit
• Annexation exception — Tax revenue from annexed property is exempt from the cap
• Voter-approved increases — Any increase approved by voters in a referendum is exempt from the cap
• Levy rate vs. revenue distinction — The cap applies to revenue collected, not the tax rate imposed, creating opportunities for creative budgeting

Assessed Value as a Policy Tool

Property commissioners must understand that assessed value in Idaho is not a scientific determination—it is a policy choice made by the county assessor, an elected official who, in practice, answers to the county commissioners who appoint the assessor's budget and direction. The assessment of property for tax purposes is governed by Idaho Code § 63-301 et seq., which requires property to be assessed at market value. However, "market value" is an estimate, not a fact. Two professional appraisers can reach substantially different conclusions about the same property's value.

Counties that wish to increase tax revenue without raising rates typically employ several assessment strategies:

• More frequent reappraisals, bringing assessed values closer to current market values in rising markets
• Reduced assessment protest procedures that discourage appeals by property owners
• More aggressive interpretation of what constitutes "market value" for unique or non-standard properties
• Capitalizing on market upswings to move assessed values up quickly, then resisting downward adjustments in downturns

The Idaho Constitution, Article VII, § 6, requires that all property be taxed uniformly and in proportion to its value.^[9] This sounds protective, but in practice it provides little protection because "value" itself is flexible. If all properties are assessed at 95% of market value (or 85%, or 110%), the constitutional requirement of uniformity is technically satisfied even if market values themselves fluctuate significantly.

The Limits of Tax Authority

Counties may not create new taxes without statutory authorization. Nor may they impose taxes disguised as "fees" when the fee is actually a tax in economic substance.^[10] Some counties have attempted to impose "development impact fees," "facility fees," or "maintenance fees" that are, in economic effect, broad-based taxes on activities the Legislature has not authorized. These overreach. Courts have invalidated such attempts, though not uniformly across all jurisdictions.

Land Use and Planning Authority

Idaho Code Title 67, Chapter 65, known as the Local Land Use Planning Act (LLUPA), delegates to counties extensive authority over land use. This includes the power to adopt comprehensive plans, zoning ordinances, subdivision regulations, and development standards. This authority has grown substantially since its creation in 1975, and today counties exercise remarkable control over what property owners may do with their own land.

The statutory delegation is broad: counties may adopt zoning ordinances that divide the county into districts with different permitted uses, density requirements, setback minimums, and design standards. Counties may require subdivision approval before land can be divided and sold. Counties may impose conditions on development: traffic impact fees, utility capacity contributions, open space requirements, and architectural review.^[11]

Comprehensive Planning Requirements

Idaho Code § 67-6501 requires that counties adopt a comprehensive plan—a broad policy document that guides land use decisions for 20+ years. The comprehensive plan is not binding in a strict sense; zoning ordinances and development decisions must be "consistent with" the plan but need not mechanically follow every phrase. However, a comprehensive plan has enormous practical effect because:

• It establishes policy principles that commissioners are expected to apply in zoning decisions
• It creates liability for commissioners who deviate from it without clear justification
• It becomes the presumptive standard against which property owner litigation is judged
• It effectively locks county policy in place for years, because changing the comprehensive plan requires elaborate public process

The planning process typically includes multiple public hearings, planning commission review, and ultimately county commission adoption. However, the breadth of topics that can be addressed in a comprehensive plan is extraordinary: housing policy, agricultural preservation, environmental protection, economic development, transportation, infrastructure, and aesthetic objectives.

Zoning Ordinances and Use Restrictions

Under the delegated authority of Title 67, Chapter 65, counties adopt zoning ordinances that specify what uses are permitted in each zone, at what density, and subject to what conditions. A typical county zoning ordinance might specify that agricultural land may not be developed for residential use without a conditional use permit, or that commercial development in certain zones requires a planned unit development process with public review.

Zoning ordinances can be extraordinarily detailed. Some Idaho county zoning codes exceed 100 pages and include detailed design standards, landscaping requirements, parking ratios, sign regulations, and building setback requirements. All of this authority comes from the delegation in Title 67, Chapter 65.

The critical issue is this: zoning ordinances restrict what a property owner may do with his or her own land. If the comprehensive plan and zoning ordinance designate your 40-acre parcel as "agricultural" with a minimum density of one dwelling per 40 acres, you cannot subdivide it for residential development, no matter that an adjacent county allows such development, and no matter that the market demand for residential lots is high. Your property rights have been constrained by county policy.

Constitutional Tension: LLUPA vs. Idaho Constitutional Property Rights

Subdivision Regulations and Plat Requirements

Counties may require that land be subdivided only in accordance with county subdivision regulations. Before land can be divided and sold separately, the subdivider must typically obtain county approval of a plat (map) showing the divisions. Subdivision regulations can impose substantial requirements:

• Dedication of land for roads, schools, or parks (or payment of fees in lieu of dedication)
• Installation of utilities (water, sewer, electricity, broadband)
• Right-of-way improvements and traffic control
• Environmental review and mitigation
• Bonding and phasing requirements

These requirements can substantially increase the cost of developing land, and in some cases make development economically infeasible. Again, this authority is delegated by the Legislature, but it has real effect on property owners' ability to develop.

The Ordinance Power: What Counties Can and Cannot Regulate

Idaho Code § 31-714 grants to county commissioners the power to pass ordinances "on all subjects of a local nature not prohibited by law, or which shall be deemed advisable for the general welfare of the county."^[6] This language sounds broad, but it is significantly narrower than municipal ordinance authority, and Idaho courts have been skeptical of county ordinances that overreach.

Subject Matter Limitations

The ordinance power is limited to "subjects of a local nature." This excludes ordinances on matters of statewide concern or matters already occupied by state law. For example, a county cannot pass an ordinance regulating the practice of law (a statewide professional matter) or establishing professional licensing requirements beyond what state law permits. Nor can a county pass an ordinance that contradicts or is more restrictive than state law on a subject state law has comprehensively addressed.

Courts recognize that some subjects are of local concern (e.g., roads, local animal control, county building standards) while others are of statewide concern (e.g., professional licensing, banking, motor vehicle safety standards). Counties cannot regulate statewide concerns through ordinance.

Contrast with City Ordinance Authority

Cities in Idaho have broader ordinance power than counties. Idaho Code § 50-1401 grants cities the authority to pass ordinances on matters of local concern "which shall be deemed advisable for the general welfare" and expressly authorizes cities to enact local police power ordinances on subjects that are not "in conflict" with state law.^[13] This municipal ordinance power is broader than the county power for a historical reason: cities are thought to be more proximate to their residents and thus appropriate repositories of local police power.

In practical terms, this means cities can sometimes regulate subjects that counties cannot. A city can establish local animal control ordinances, noise ordinances, business licensing requirements, and development standards that go beyond what state law requires, provided they do not directly conflict with state law. Counties have less latitude.

What Counties Can Regulate by Ordinance

Counties can typically regulate, by ordinance:

• County property, buildings, and internal operations
• County roads and access to county facilities
• Management of county forests and public lands (subject to state and federal law)
• County procurement and contracting procedures
• County records and public meetings procedures
• Fees for county services (within limits)
• Land use and development (under the delegated authority of Title 67, Ch. 65)
• Local nuisances that are genuinely county concerns

What Counties CANNOT Regulate by Ordinance

Counties cannot, by ordinance:

• Create or regulate professions or occupations (this is statewide licensing authority)
• Regulate conduct that is primarily a state or federal concern (motor vehicle safety, firearms regulation at the state level)
• Impose taxes not authorized by statute (taxes must be directly authorized; ordinances cannot create new taxes)
• Regulate subjects that state law has comprehensively preempted or expressly prohibited
• Delegate non-delegable duties or improperly restrict state authority

A county ordinance that exceeds this authority is ultra vires—beyond the power of the county—and can be invalidated by a court.

Contract Authority and Public Works

County commissioners have broad authority to enter into contracts necessary for county operations. This includes contracts for supplies, services, professional services, construction, consulting, and intergovernmental agreements. However, this authority is constrained by several important procedural requirements designed to ensure transparency and fair competition.

Public Works Bidding Requirements

Idaho Code § 67-2805 establishes competitive bidding requirements for public works projects. In general, any public works project (construction, renovation, or repair) estimated to cost more than a statutory threshold (currently $100,000, though this is adjusted periodically) must be competitively bid. The county must provide public notice of the bid opportunity, allow adequate time for bidders to submit bids, and award to the lowest responsible bidder.^[14]

The purpose of competitive bidding is to ensure that public money is spent efficiently and that contracts are not awarded based on favoritism or political relationships. Commissioners who bypass bidding requirements, or who establish specifications so narrow that only one contractor can bid, violate this statute.

Exceptions to bidding include:

• Projects estimated to cost less than the statutory threshold
• Emergency projects where delay would cause substantial loss or damage (though emergency status must be properly documented)
• Projects where the county itself has special expertise and can perform the work more economically (the "force account" exception, subject to strict requirements)
• Intergovernmental contracts with other government entities
• Professional services, which may be procured through a separate process (request for proposals)

Professional Services Contracts

Professional services—including legal, engineering, consulting, architectural, and design services—are often not subject to competitive bidding in the strict sense, because the quality of the professional judgment is not easily reduced to lowest-cost competition. Instead, counties typically use a "request for proposals" (RFP) or "request for qualifications" (RFQ) process, where firms are invited to submit qualifications and proposals, and the county selects the best qualified firm or the firm offering the best value.^[15]

However, even professional services selection must be transparent and based on stated criteria. Commissioners cannot simply hire their friend's consulting firm without competitive process. Doing so is not only poor governance; it may expose the county to legal liability.

Intergovernmental Agreements

Idaho Code § 67-3401 et seq. authorizes counties to enter into agreements with other governmental entities (cities, other counties, special districts, state agencies, and federal agencies) to coordinate services, share facilities, or jointly exercise authority.^[16]

Intergovernmental agreements are useful for counties and cities that wish to jointly manage a facility (e.g., a shared animal shelter or emergency dispatch center), or coordinate planning (e.g., a regional comprehensive plan). These agreements should be in writing, approved by all parties, and clearly specify which entity is responsible for which functions and how costs are shared.

Transparency and Public Records Requirements

All county contracts must be public records (subject to limited exemptions for attorney-client privileged materials and other confidential information). Commissioners must hold public meetings to consider contracts above certain thresholds, and the public has the right to attend and observe. Contracts cannot be finalized without compliance with the Idaho Open Meetings Law (Idaho Code § 67-2340 et seq.).

What Commissioners CANNOT Do: Ultra Vires Acts

An ultra vires act is an act that exceeds the authority granted by law. County commissioners regularly face pressure to act in ways that feel necessary, reasonable, or even urgent—but are not authorized by statute. The hard truth: if the Legislature has not granted the power, commissioners do not have it, regardless of circumstances.

Creating or Levying Unauthorized Taxes or Fees

Counties cannot create new taxes or fees without statutory authorization. Commissioners cannot, for example, decide that the county needs revenue for economic development and impose a 1% sales tax on business transactions, or create a "sustainability fee" on development, or levy a special tax on luxury properties. If the Legislature has not authorized the tax, counties cannot impose it.

The distinction between a "tax" and a "fee" is important but sometimes blurry. A tax is a general exaction imposed on a broad class of persons or properties and used for general county purposes. A fee is a charge for a specific service or the use of a specific county facility. Fees must be reasonably related to the cost of providing the service and cannot be used as a hidden tax on disfavored activities.

Delegating Non-Delegable Duties

Certain duties are non-delegable—they must be performed by the county commissioners themselves, not by staff or other officials. Commissioners cannot, for example, delegate their budgeting authority to the county administrator, or delegate their power to appoint department heads, or delegate their obligation to attend public meetings and participate in votes.

Commissioners can delegate administrative functions and day-to-day operations to staff. But decisions that involve policy-making or discretionary judgment must remain with the commissioners.

Acting Outside of Properly Noticed Public Meetings

Idaho Code § 67-2340 et seq. (the Open Meetings Law) requires that county commissioners conduct the county's business in public meetings, except in limited circumstances (executive sessions for attorney-client privilege, real estate negotiations, personnel matters, etc.). Commissioners cannot make county decisions informally, in private conversations, via email votes, or in unnoticed meetings.

A decision made in violation of the Open Meetings Law is potentially void, and county officials can be held personally liable for damages if they knowingly violate the law.

Exceeding the Bounds of Delegated Authority

Even when commissioners believe they are acting on a matter within their general purview, they can exceed the bounds of delegated authority if they act in a way the statute does not permit. For example:

• Zoning decisions outside comprehensive plan: A county cannot rezone property in a way that directly contradicts the adopted comprehensive plan, even if individual commissioners prefer a different use. The zoning must be consistent with the plan.
• Economic development agreements that exceed authority: A county cannot use public funds to make payments to private businesses or to forgive obligations owed to the county, except as specifically authorized by statute (e.g., tax incentive zones, urban renewal districts). Some commissioners have attempted to approve "economic development agreements" that function as hidden subsidies. These overreach.
• Conditional use permits that establish new policy: A county can issue conditional use permits for land uses that are permitted subject to conditions, but cannot use the conditional use permit process to establish new policy or to prohibit uses the zoning ordinance allows. The permit is a case-by-case decision application, not a policy-making tool.

Personal Liability for Ultra Vires Acts

Commissioners who knowingly or recklessly act beyond their authority can be personally liable for damages, though Idaho provides limited governmental immunity protections for good-faith governmental decisions. The safest rule: if you are not confident that a particular action is authorized by statute, ask the county counsel for a legal opinion before proceeding.

Core Principles for Exercising County Authority

As commissioners exercise the powers delegated by the Idaho Legislature, several core principles should guide decision-making:

1. Powers Are Enumerated, Not Implied

County authority comes entirely from statute. If a power is not enumerated in Idaho Code, the county does not possess it. This is not a limitation to regret—it is a protection. It means that county government cannot expand without legislative consent, and property owners can rely on knowing the outer bounds of county authority.

2. Exercise Authority with Restraint

Just because the Legislature has granted a power does not mean it should be exercised to its fullest extent. Commissioners exercise wisdom by recognizing that some county powers—particularly the taxing power and land use authority—have substantial effect on property owners and economic activity. Wise commissioners use these powers sparingly and only when genuinely necessary.

3. All Decisions Must Be Made Transparently, in Public Meetings

The Idaho Open Meetings Law is not a technicality; it is foundational to legitimate government. Commissioners must hold public meetings with proper notice, must allow the public to observe and speak, and must conduct the county's business in the open. Decisions made in backroom conversations or informal email exchanges, even if eventually ratified in a public meeting, undermine public trust and can be invalidated.

4. Recognize Constitutional Limits on All Authority

Even when the Legislature has delegated authority, that authority is limited by the Idaho Constitution. The Constitution protects property rights, due process, free speech, free assembly, and other fundamental liberties. A county ordinance or action that violates these constitutional protections is invalid, even if the Legislature delegated authority on the subject.

5. Act Consistently with Your Own Ordinances and Policies

Commissioners who make decisions arbitrarily—approving one development application while denying a virtually identical application—expose the county to legal liability and create legitimate claims that the county is not following its own rules. Consistency and predictability are essential to legitimate government.

6. Document the Factual Basis for Discretionary Decisions

When commissioners make discretionary decisions (e.g., approving or denying a zoning variance, issuing a conditional use permit), those decisions should be documented with a written statement of findings that explains what facts the commissioners relied on and how those facts support the decision. This creates a record that can be defended in court if challenged.

7. Consult County Counsel Before Overreaching

Commissioners who are uncertain whether a proposed action is within their authority should ask the county counsel (or the county's outside legal counsel) for an opinion before acting. The cost of a brief legal memo is far less than the cost of litigation over an ultra vires act.