Washington Negligence Law: Elements, Comparative Fault, and Damages

Washington negligence law lets an injured person recover compensation by proving four elements — duty, breach, causation, and damages — and it uses a pure comparative fault rule that reduces your award by your share of blame but never wipes it out. That last piece sets Washington apart from most states, where being more than half at fault ends the case. Here, even a plaintiff found 99% responsible still collects 1% of the damages from the other party.¹

The Four Elements You Have to Prove

Every negligence claim in the state stands or falls on four elements. Miss one and the case is over.

Duty. The other party had to owe you a legal obligation to act with reasonable care. Most everyday situations create one automatically. Drivers owe other drivers a duty not to drive distracted. Property owners owe visitors a duty to keep their premises reasonably safe. The specifics change with the relationship, but the baseline question stays the same: would a reasonably careful person in that position have taken precautions?

Breach. The defendant fell short of that standard. Courts compare the defendant’s conduct to what a hypothetical reasonable person would have done in the same circumstances. A store owner who leaves a puddle in the entryway for hours has likely breached a duty; one who cleans it up in minutes probably hasn’t.

Causation. This piece has two layers. Cause-in-fact asks whether the injury would have happened at all if the defendant had acted properly — the “but-for” test. Proximate cause then limits liability to harms that were a foreseeable consequence of the conduct. If a chain of events turns bizarre and unforeseeable, the link is too thin to support liability.

Damages. You have to show real, measurable harm. Medical bills, lost income, property repair, pain and suffering. Without an actual loss, even clear carelessness produces no claim.

How Your Own Fault Affects What You Recover

Washington’s pure comparative fault system, codified in RCW 4.22.005, is the rule that most changes the math of a case. Your award is reduced by your percentage of responsibility, and nothing more. If a jury finds you 70% at fault and awards $200,000, you still collect $60,000.¹

The rule applies to injury, death, and property damage claims alike, and it works regardless of whether the plaintiff’s conduct would have been a complete bar under older contributory negligence rules.¹

What Counts as Fault

Washington defines fault broadly. Under RCW 4.22.015, the term reaches negligent or reckless conduct, strict liability, product liability, breach of warranty, unreasonable assumption of risk, and unreasonable failure to avoid injury or mitigate damages.² That last category matters. If you refuse recommended medical treatment or take actions that make your injuries worse, the jury can assign you a percentage of fault for the added harm. The defendant carries the burden of proving you failed to mitigate, but when that argument lands, the failure is folded into the comparative fault calculation rather than treated as a separate defense.

How the Jury Compares Fault

The jury weighs the nature of each person’s conduct and how strongly it contributed to the harm.² Percentages have to total 100% across every party, plaintiff included.

When More Than One Defendant Is Involved

The default rule for multiple defendants is several liability. Each defendant pays only the share matching their percentage of fault. If three defendants are found 50%, 30%, and 20% responsible, each writes a check for that portion and nothing more. One defendant’s inability to pay does not shift onto the others.³

Two situations restore full joint and several liability, meaning each defendant is on the hook for the whole judgment:

Defendants who acted in concert, coordinated their wrongful conduct, or acted as one another’s agent.³
Cases where the jury finds the plaintiff bears zero fault. All defendants are then jointly and severally liable for the total.³

The practical takeaway is worth remembering. If you were even 1% at fault, several liability kicks in and you carry the risk that a judgment-proof defendant cannot pay. Fault-free status is worth fighting for when multiple defendants are involved.

What You Can Recover

Washington divides negligence damages into two categories, and it declines to impose caps on either.

Economic Damages

These are the losses you can back with a receipt or a pay stub. Medical bills, future treatment costs, lost wages, diminished earning capacity, and property repair or replacement all belong here. There is no statutory cap.

Non-Economic Damages

Non-economic damages cover harm that does not come with an invoice: physical pain, emotional distress, loss of enjoyment of life, and the effect on close relationships (sometimes called loss of consortium). Washington places no cap on these damages, and that is true even in medical malpractice cases, where many other states impose statutory limits.

No Punitive Damages

Washington does not allow punitive damages in ordinary negligence cases. State courts have long treated them as contrary to public policy unless a specific statute authorizes them. In a typical car accident, slip-and-fall, or malpractice case, you cannot recover damages designed to punish the defendant. The award is meant to compensate you for what you lost.

Statute Violations Are Evidence, Not Automatic Proof

Most states treat a violation of a safety statute as automatic proof of negligence. Washington does not. Under RCW 5.40.050, breaking a statute, ordinance, or administrative rule is generally not negligence per se. The jury can consider the violation as evidence of negligence, but it does not, on its own, prove the claim.⁴

Four categories are treated as negligence per se:

Electrical fire safety violations
Failure to use smoke alarms
Failure to sterilize needles and instruments used in tattooing, body piercing, or electrology
Driving under the influence of alcohol or drugs

Outside those categories, a driver who ran a red light is not automatically negligent. The jury weighs the violation with the rest of the evidence and decides for itself whether the conduct fell below a reasonable standard of care.⁴

Medical Malpractice Uses a Different Standard

Claims against healthcare providers do not use the “reasonable person” measuring stick. Under RCW 7.70.040, the standard is what a reasonably prudent healthcare provider in the same field would do, practicing in Washington under the same or similar circumstances.⁵ A general surgeon is measured against other general surgeons, not against family doctors.

Expert testimony is practically mandatory. Without another qualified professional explaining what the standard of care required and how the defendant fell short, a malpractice claim almost never survives. That is the biggest barrier to entry for these cases and part of why they cost more to bring.

Informed Consent Claims

Washington recognizes a separate claim when a provider fails to adequately inform you before treatment. Under RCW 7.70.050, you must prove four things:

The provider failed to disclose a material fact about the treatment.
You consented without knowing that fact.
A reasonable patient in your position would have refused had they known.
The treatment caused the injury.

The standard is patient-centered rather than physician-centered. The question is what a reasonable patient would want to know, not what doctors typically disclose. Expert testimony is still required to establish the material facts themselves, including the nature of the treatment, expected results, recognized alternatives, and serious risks. The consent requirement is waived during recognized medical emergencies when the patient cannot consent and no authorized representative is available.⁶

Deadlines to File

Missing a filing deadline ends the claim, no matter how strong the facts are.

General Personal Injury and Property Damage

Most negligence claims — car accidents, slip-and-falls, property damage — must be filed within three years. RCW 4.16.080 sets the deadline for actions involving injury to a person or personal property.⁷ The clock generally starts on the date of the injury.

Medical Malpractice

Healthcare claims run on a more complex timeline under RCW 4.16.350. You get the later of two dates: three years from the act or omission that caused the harm, or one year from the date you discovered (or reasonably should have discovered) the connection between the treatment and your injury. A hard outer limit still applies: no medical malpractice lawsuit can be filed more than eight years after the act or omission, regardless of when the problem came to light.⁸

The eight-year limit is paused if the provider committed fraud, intentionally concealed the error, or left a foreign object inside the patient that had no therapeutic or diagnostic purpose. In those situations, you have one year from the date you actually learn of the fraud, concealment, or foreign object to file suit.⁸

Extra Step for Claims Against Government Entities

Suing a city, county, or state agency requires a step that catches many people off guard. Under RCW 4.96.020, you must file a formal tort claim with the entity’s designated agent before you can sue. The claim has to include your name and contact information, a description of what happened, when and where the injury occurred, the names of anyone involved, and the amount you are claiming.⁹

After filing, you must wait sixty calendar days before filing a lawsuit. The statute of limitations is paused during that window, so you do not lose time.⁹ Skip this step and your case gets dismissed. Check for it early whenever the party that injured you is a government employee or agency acting in an official capacity.

Wrongful Death

When negligence causes a death, the deceased person’s personal representative can bring a wrongful death action under RCW 4.20.010. The claim seeks both economic and non-economic damages on behalf of surviving beneficiaries.¹⁰

The statute sets a priority among family members. The action is first maintained for the benefit of the surviving spouse or state registered domestic partner and children, including stepchildren. If none of those relatives survives, parents or siblings may qualify as beneficiaries.¹⁰ The general three-year personal injury statute of limitations applies here as well.

Defenses You Should Expect

Defendants have several tools beyond simply denying they were careless.

Comparative Fault

The most common defense argues that you were partly responsible. Because your award drops by your percentage of fault, even a modest allocation can significantly cut the final number. Expect the defense to scrutinize your conduct before, during, and after the incident.

Sudden Emergency

Under Washington’s pattern jury instruction, a person suddenly confronted by an emergency through no fault of their own, who makes a reasonable split-second choice, is not negligent even if the choice wasn’t the best available. The emergency has to be genuinely sudden, the defendant cannot have created it, and there must have been no time to deliberate. A driver who swerves to avoid a child darting into the road can invoke it. A driver who was speeding when the situation developed cannot, because their own conduct helped cause it.

Failure to Mitigate

Washington folds the duty to mitigate into its comparative fault framework rather than treating it as a standalone defense. RCW 4.22.015 defines “fault” to include an unreasonable failure to avoid injury or mitigate damages.² If you refuse recommended treatment without good reason and your condition worsens, the defendant can argue that some share of your damages came from your own inaction. The defendant carries the burden of proving it, and it does not erase liability for the original injury. It only reduces the total by the portion attributable to the unreasonable failure.

1
Washington State Legislature. RCW 4.22.005 – Effect of Contributory Fault
2
Washington State Legislature. Chapter 4.22 RCW – Contributory Fault
3
Washington State Legislature. RCW 4.22.070 – Proportionate Liability
4
Washington State Legislature. RCW 5.40.050 – Breach of Duty – Evidence of Negligence
5
Washington State Legislature. RCW 7.70.040 – Necessary Elements of Proof That Injury Resulted From Failure To Follow Accepted Standard of Care
6
Washington State Legislature. Revised Code of Washington 7.70.050 – Failure to Secure Informed Consent
7
Washington State Legislature. RCW 4.16.080 – Actions Limited to Three Years
8
Washington State Legislature. RCW 4.16.350 – Actions Based on Professional Negligence of Health Care Provider
9
Washington State Legislature. RCW 4.96.020 – Tortious Conduct of Local Governmental Entities – Claims – Presentment
10
Washington State Legislature. Chapter 4.20 RCW – Wrongful Death