Arizona Tort Law: Personal Injury, Negligence, and Liability Standards
Arizona tort law governs civil liability for personal injuries, property damage, and economic harm caused by the wrongful conduct of private parties. The framework draws on Arizona Revised Statutes (A.R.S. Title 12), common law doctrine developed through Arizona appellate decisions, and procedural rules established by the Arizona Supreme Court. Understanding how negligence standards, comparative fault allocations, and damages caps operate in Arizona is essential for anyone navigating personal injury litigation, insurance disputes, or professional liability claims in the state.
Definition and scope
Arizona tort law is a branch of civil law that assigns liability when one party's conduct causes legally cognizable harm to another. A tort claim is distinct from a criminal prosecution: the state does not bring the action, and the remedy is compensatory rather than punitive incarceration. Three broad categories define the tort landscape in Arizona:
- Intentional torts — Battery, assault, false imprisonment, intentional infliction of emotional distress, trespass, and conversion. Intent to commit the act (not necessarily to cause harm) is the operative element.
- Negligence torts — Harm arising from a breach of a duty of reasonable care. Negligence is the dominant category in Arizona personal injury litigation, encompassing motor vehicle accidents, slip-and-fall incidents, medical malpractice, and product defects.
- Strict liability torts — Liability imposed without proof of fault, applicable primarily to abnormally dangerous activities and defective products under Arizona's adoption of the Restatement (Second) of Torts § 402A framework.
The distinction between intentional and negligence torts carries practical weight: intentional tort claims may support punitive damages under A.R.S. § 12-820.04, while negligence claims are subject to Arizona's comparative fault regime.
Scope boundary: This page addresses Arizona state tort law as codified in A.R.S. Title 12 and interpreted by Arizona courts. Federal tort claims brought under 28 U.S.C. § 1346 (the Federal Tort Claims Act), tribal sovereign immunity rules applicable in Arizona Tribal Courts, and cross-border disputes requiring choice-of-law analysis fall outside this page's coverage. Claims governed by federal preemption doctrines — such as aviation torts under the Federal Aviation Act — are also not covered here.
How it works
Negligence: the four-element structure
Arizona negligence claims require a plaintiff to establish four discrete elements, as consistently applied by Arizona appellate courts:
- Duty — The defendant owed a legal duty of care to the plaintiff. Arizona follows a general duty rule: every person has a duty to exercise reasonable care to avoid creating unreasonable risks of harm to others (Gipson v. Kasey, 214 Ariz. 141 (2007)).
- Breach — The defendant's conduct fell below the standard of care a reasonable person would exercise under the same circumstances.
- Causation — The breach was both the actual cause (but-for causation) and the proximate (legal) cause of the plaintiff's harm.
- Damages — The plaintiff suffered actual, quantifiable harm — physical injury, economic loss, or emotional distress supported by evidence.
Arizona's pure comparative fault system
Arizona applies a pure comparative fault model under A.R.S. § 12-2505. A plaintiff's own negligence does not bar recovery; instead, damages are reduced in proportion to the plaintiff's share of fault. If a jury assigns 40% fault to the plaintiff and awards $100,000, the net recovery is $60,000. Arizona abolished contributory negligence in Quinlan v. Cecil, replacing it with this proportional allocation system.
Fault can be apportioned among multiple defendants under A.R.S. § 12-2506, which implements several liability as the default: each defendant pays only their proportionate share of fault-based damages. Joint and several liability survives for defendants found to have acted with intent. This structure is part of the broader civil procedure framework described in Arizona Civil Procedure Basics.
Statute of limitations
The standard personal injury statute of limitations in Arizona is 2 years from the date the claim accrues (A.R.S. § 12-542). Medical malpractice claims also carry a 2-year period under A.R.S. § 12-542, with a discovery rule tolling the period until the plaintiff knew or reasonably should have known of the injury. Claims against public entities require a 180-day notice of claim filed before suit, under A.R.S. § 12-821.01. The Arizona Statute of Limitations page provides a full cross-category reference.
Common scenarios
Motor vehicle accidents
Arizona requires minimum liability insurance of $25,000 per person and $50,000 per occurrence (A.R.S. § 28-4009). Negligence per se applies when a defendant violates a traffic statute — the statutory violation substitutes for the breach element if the plaintiff belongs to the class the statute was designed to protect.
Premises liability
Property owners owe different duty levels depending on entrant classification. Arizona follows the traditional trichotomy:
- Invitees — Highest duty; owners must inspect and remedy known and reasonably discoverable hazards.
- Licensees — Duty to warn of known concealed dangers.
- Trespassers — Duty to refrain from willful or wanton injury; child trespassers receive expanded protection under the attractive nuisance doctrine (A.R.S. § 12-2501).
Medical malpractice
A.R.S. § 12-2602 requires expert affidavit certification at filing for Arizona medical malpractice claims. Qualified professionals must affirm that the standard of care was breached. Damages are not capped for economic losses; non-economic damage caps were invalidated by the Arizona Supreme Court in Watts v. Scottsdale Healthcare Corp., 521 P.3d 1140 (Ariz. 2022).
Product liability
Arizona applies strict liability to manufacturers and sellers of defective products. Three defect categories govern analysis: manufacturing defects, design defects (evaluated under the consumer expectations or risk-utility test), and failure-to-warn defects. The seller in the ordinary course of business is potentially liable alongside the manufacturer under Karjala v. Johns-Manville Products Corp..
Intentional infliction of emotional distress (IIED)
Arizona recognizes IIED as a standalone tort. The plaintiff must prove conduct that was extreme and outrageous, intentional or reckless, and that caused severe emotional distress (Ford v. Revlon, Inc., 153 Ariz. 38 (1987)). The threshold is high; rudeness or insensitivity does not meet the standard.
Decision boundaries
When negligence per se applies vs. the reasonable person standard
Negligence per se elevates a statutory violation to a presumptive breach of duty. Arizona courts apply it when: (1) the defendant violated a statute or regulation, (2) the plaintiff was within the class the statute protected, and (3) the harm was the type the statute aimed to prevent. Where no statute governs, the reasonable person standard controls, and breach becomes a jury question.
Strict liability vs. negligence in product defect cases
| Factor | Strict Liability | Negligence |
|---|---|---|
| Fault required | No | Yes |
| Focus | Product condition at sale | Manufacturer's conduct |
| Defense of reasonableness | Not available | Available |
| Typical defendant | Manufacturer, seller | Manufacturer, designer |
Strict product liability does not require proving the manufacturer acted carelessly — only that the product was defective and unreasonably dangerous at the time of sale.
Public entity liability
Arizona's regulatory context for the legal system extends to governmental tort immunity. Under A.R.S. § 12-820.01, public entities retain immunity for discretionary governmental functions. Operational-level failures (e.g., road maintenance, building code enforcement) may give rise to liability. The mandatory 180-day pre-suit notice under A.R.S. § 12-821.01 is a jurisdictional prerequisite — failure to file bars the claim entirely.
Damages categories and limits
Arizona permits recovery of:
- Economic damages — Medical expenses, lost wages, future earning capacity, property damage (no statutory cap).
- Non-economic damages — Pain and suffering, loss of consortium, emotional distress (no judicially enforceable cap after Watts v. Scottsdale Healthcare Corp.).
- Punitive damages — Available for intentional misconduct or conduct showing "evil mind" (Linthicum v. Nationwide Life Ins. Co., 150 Ariz. 326 (1986)). Must be proven by clear and convincing evidence under A.R.S. § 12-820.04.
The complete overview of tort categories and foundational doctrine is addressed in Arizona Tort Law Overview. Arizona legal system coverage and the main authority index provide cross-referenced access to