Case Law and Precedent in Washington State Courts

Washington State courts generate binding legal rules not only through statutes enacted by the Legislature but through judicial decisions that interpret those statutes, apply constitutional provisions, and fill gaps where written law is silent. This page covers how case law forms, how precedent operates within Washington's court hierarchy, the common situations in which precedent is invoked or distinguished, and the boundaries that define when a prior ruling controls an outcome. Understanding these mechanisms is essential background for anyone navigating Washington's legal system, from practicing attorneys to self-represented litigants studying court records.

Definition and scope

Case law is the body of law created by courts through their written decisions in actual disputes. In Washington, judicial decisions carry legal authority under the doctrine of stare decisis — the principle that courts should follow prior rulings when the same legal question arises again under materially similar facts. The Washington Supreme Court articulated this principle in its procedural traditions, and it is reinforced through the Washington Rules of Appellate Procedure (RAP), which govern the form and publication of opinions.

Washington case law operates at every level of the court hierarchy, but not all decisions carry the same weight. Published opinions from the Washington Supreme Court bind all lower courts in the state without exception. Published opinions from the Washington Court of Appeals bind Superior Courts and courts of limited jurisdiction within the state, subject to any conflicting Supreme Court authority. Unpublished opinions — designated as such under RAP 14.1 — have no binding precedential effect, though courts may find them persuasive.

This page covers Washington State court decisions produced by the Washington Supreme Court, the Washington Court of Appeals (Divisions I, II, and III), and Superior Courts where their rulings become part of the interpretive record. For foundational background on how Washington's legal system is organized, see How Washington's Legal System Works.

Scope limitations: This page does not address federal case law produced by the U.S. District Courts in Washington, the Ninth Circuit Court of Appeals, or the U.S. Supreme Court, except where federal precedent bears directly on Washington constitutional questions. Decisions from Washington Tribal Courts operate under separate sovereign authority and are not part of the state case law hierarchy. Administrative law precedent generated by agencies such as the Washington Office of Administrative Hearings follows distinct procedural rules addressed separately in Regulatory Context for Washington's Legal System.

How it works

Washington's precedent system functions through a structured hierarchy that determines which court's decisions control which disputes.

1. Decision issuance. A Washington appellate court resolves a case and issues a written opinion. The authoring judge writes the majority opinion; concurrences and dissents may also be published but do not themselves create binding rules.
2. Publication designation. Under RAP 12.3, the court designates whether an opinion is published. Only published opinions constitute precedent under Washington law.
3. Headnote and syllabus. The Washington Reports, the official reporter published by the Washington State Law Library, supplements published opinions with headnotes identifying the legal propositions established. These headnotes are editorial aids, not binding text — the operative language is the opinion itself.
4. Citation and application. In subsequent litigation, parties cite published opinions by volume and page number in the Washington Reports (Wn.2d for Supreme Court, Wn. App. for Court of Appeals). A lower court must follow a binding precedent unless it can be distinguished on the facts or unless the appellate court overrules it.
5. Distinguishing and overruling. A court may depart from precedent by showing that the facts of the current case differ materially from the earlier one (distinguishing) or, in the case of the Washington Supreme Court, by expressly overruling the prior decision. The Court of Appeals cannot overrule Washington Supreme Court precedent — it may only note the conflict and certify the issue upward.
6. Retroactivity. New rules announced in civil cases generally apply retroactively to all cases still on direct review. Criminal retroactivity follows the framework from Teague v. Lane (489 U.S. 288, 1989), as adopted in Washington practice.

For precise definitions of terms used throughout this process, see Washington Legal System Terminology and Definitions.

Common scenarios

Statutory interpretation. The most frequent source of case law in Washington involves courts interpreting the Revised Code of Washington (RCW). When statutory text is ambiguous, courts apply the plain meaning rule first, then legislative history, then broader policy considerations. A published Court of Appeals decision interpreting an RCW provision becomes the operative guide for that provision's application until the Supreme Court or Legislature overrides it.

Constitutional questions. Washington's Constitution contains provisions that the Washington Supreme Court has interpreted independently of federal constitutional doctrine. The Court has applied Gunwall analysis — derived from State v. Gunwall, 106 Wn.2d 54 (1986) — to determine when Washington's constitution affords greater rights than the U.S. Constitution. This analysis proceeds through 6 factors including the textual language, constitutional history, and Washington's preexisting common law.

Common law development. In areas such as Washington tort law and Washington contract law, courts develop rules in the absence of governing statutes. A 2-part distinction applies here: statutory cases interpret enacted text and are superseded when the Legislature amends the statute; common law cases remain operative unless a subsequent court decision or statute displaces them.

Administrative agency review. When the Superior Court or Court of Appeals reviews an agency decision, it applies the Administrative Procedure Act (RCW 34.05) deferential standard for questions of fact and a de novo standard for questions of pure law. Precedent in this setting establishes what level of deference applies to which agency determinations.

Conflict among Court of Appeals divisions. Washington's Court of Appeals is divided into Division I (Seattle), Division II (Tacoma), and Division III (Spokane). When two divisions issue contradictory published opinions, neither controls outside its geographic district, creating a split that typically prompts Supreme Court review.

Decision boundaries

The following classification framework defines when a prior Washington decision controls a present case versus when it does not:

Binding vs. persuasive authority

Temporal scope. The Washington Supreme Court may limit a new rule to prospective application in rare circumstances, particularly when retroactive application would produce substantial inequity. The Court articulates this limitation expressly in the opinion itself; silence on the question defaults to retroactive application.

Overruling threshold. Washington courts apply a heightened threshold before overruling prior decisions, requiring courts to weigh: (a) workability of the existing rule, (b) reliance interests developed under it, (c) doctrinal coherence with related areas of law, and (d) changes in factual circumstances or legal understanding since the prior decision. This framework mirrors the U.S. Supreme Court's stare decisis factors but is applied independently by Washington courts.

Federal preemption boundary. When federal law preempts state law under the Supremacy Clause, Washington case law interpreting the preempted state rule ceases to govern. The boundary between preempted and non-preempted state authority is itself a question of federal law resolved by federal courts, not Washington courts.

For the complete resource index covering court decisions and public record access, the Washington State Courts homepage and the Washington State Legislature's database maintain searchable repositories of published opinions and codified law. Additional context on the regulatory environment surrounding Washington courts appears throughout the Washington Legal System reference index.

References

• Washington State Courts — Rules of Appellate Procedure (RAP)
• Washington State Law Library
• Revised Code of Washington (RCW) — Washington State Legislature
• RCW 34.05 — Washington Administrative Procedure Act
• Washington Court Rules — RAP 12.3 (Publication of Opinions)
• Washington Court Rules — RAP 14.1 (Citation of Opinions)
• Washington State Legislature — Full Text Search and Code Database
• Washington Office of Administrative Hearings