Fault and Liability
How California law actually decides who's responsible after a Santa Clarita accident, and why the answer is rarely as simple as one person being entirely at fault.
Fault and Liability: Not Always a Straightforward Matter
After an accident, one of the first questions people naturally ask is, "Whose fault was this?" It sounds like there should be a simple answer: either one person caused the accident or they did not. In real personal injury cases, however, determining responsibility is often much more complicated.
California law allows responsibility to be shared among several people or entities, and even an injured person can sometimes be assigned a percentage of fault without being completely barred from recovering compensation.
Understanding how fault works can help you make sense of what happens after an accident. It can also help explain why an insurance company may ask questions about what you were doing, why photographs and witness information can be so important, and why an adjuster's initial statement that you were "partially at fault" is not necessarily the final answer.
This guide explains the basic principles California uses to determine fault and liability in personal injury cases, including car accidents, motorcycle and pedestrian accidents, truck accidents, slip and falls, dog bites, and other types of injury claims.
Key Takeaways
What Does "Negligence" Mean?
The word negligence gets used frequently in personal injury cases, but it is not always obvious what it actually means. In everyday language, someone might describe a person as negligent simply because they made a mistake. In a legal claim, negligence generally involves failing to use the level of care that a reasonably careful person would have used under the circumstances.
California Civil Code section 1714 provides an important foundation for negligence claims. In general terms, the law imposes responsibility for injuries caused by a person's lack of ordinary care or skill in managing their person or property.
A negligence claim generally requires the injured person to establish four basic concepts:
1. Duty
The first question is whether the other person or entity owed you a legal duty to use reasonable care.
For example, drivers generally have a duty to operate their vehicles with reasonable care toward other people on the road. Property owners and others responsible for maintaining property may have duties relating to reasonably safe conditions. The precise duty can vary considerably depending on the circumstances.
2. Breach
The next question is whether that duty was violated.
A breach can involve something a person did, such as speeding, running a red light, or driving while distracted. It can also involve something a person failed to do, such as failing to repair a dangerous condition or failing to take reasonable precautions.
The question is generally whether the person's conduct fell below what a reasonably careful person would have done in the same circumstances.
3. Causation
Even if someone acted carelessly, that does not automatically make them legally responsible for every injury that happens afterward.
There must generally be a connection between the person's conduct and your injury. In other words, you generally need to establish that the alleged negligence was a substantial factor in causing the harm.
This can become particularly important when an insurance company argues that an injury came from something other than the accident—for example, a pre-existing condition, a later accident, or some unrelated medical problem.
Causation can sometimes be one of the most disputed parts of a personal injury case. It is not enough to show that someone behaved carelessly. The evidence must connect that conduct to the injury or other harm being claimed.
4. Damages
Finally, there generally must be actual harm.
Damages can include physical injuries, medical expenses, lost income, property damage, pain and suffering, and other losses depending on the circumstances of the claim.
The fact that someone behaved carelessly does not necessarily mean that a personal injury claim exists. There generally must be an actual injury or other legally compensable harm connected to that conduct.
What Is the Difference Between Fault and Liability?
The terms "fault" and "liability" are sometimes used interchangeably, but they are not necessarily the same thing.
Fault generally refers to conduct that contributed to an accident or injury. For example, a driver may be at fault because they were speeding, failed to yield, or were distracted. A property owner may potentially be at fault because of a dangerous condition that was not reasonably addressed.
Liability is the broader legal question of whether a particular person or entity can legally be held responsible for the resulting harm.
A person can sometimes be involved in an accident without being legally liable for the resulting injuries. Conversely, more than one person or entity may have legal responsibility for the same injury.
Determining liability therefore requires looking not only at what happened, but also at the applicable legal theory, the relationship between the parties, causation, possible defenses, the evidence, and the type of damages involved.
This distinction is one reason why determining "who was at fault" is not always the same thing as answering every legal question in a personal injury claim.
California Does Not Treat Fault as All or Nothing
This is one of the most important concepts for an accident victim to understand.
California follows a pure comparative negligence system. In practical terms, responsibility can be divided among the people involved in an accident. You could potentially be considered partly responsible for what happened while still having a valid claim against another person whose conduct also contributed to your injuries.
For example, imagine that two drivers are involved in a collision and the evidence ultimately supports a finding that one driver was 80 percent responsible and the other driver was 20 percent responsible. The driver who was 20 percent responsible is not automatically prevented from recovering compensation. Instead, that person's recovery would generally be reduced according to the percentage of fault assigned to that person.
This is an important distinction because many people mistakenly believe that, "If I was even partly at fault, I can't recover anything." That is generally not how California's pure comparative negligence system works.
What If I Was 10%, 20%, or 50% at Fault?
There is no general rule in California saying that you automatically lose your case once you reach a particular percentage of fault.
That means a person who is found to be 10 percent at fault can potentially recover the portion of damages attributable to the other responsible party or parties. The same basic comparative-fault principle can apply even when the injured person's percentage of fault is substantially higher.
Of course, determining that percentage is often where the real dispute begins.
The parties may disagree about what happened, which actions contributed to the accident, whether a particular action actually caused the injury, or how much responsibility should be assigned to each person.
Why Insurance Companies Ask About Your Fault
Once you understand comparative negligence, you can also understand why fault becomes such an important issue during an insurance claim.
An insurance company may investigate whether you were speeding, following too closely, distracted, failed to see something, were in the wrong location, or otherwise contributed to the accident. Some of these questions may be legitimate parts of investigating the claim. At the same time, an insurer has a financial incentive to argue that its insured was less responsible and that you were more responsible.
Suppose the evidence strongly suggests that the other driver caused the collision, but the insurance company argues that you were also 20 percent responsible. If that argument succeeds, it could reduce the amount the insurer ultimately has to pay.
That does not mean the insurance company's percentage is automatically correct.
Fault is determined based on the facts, applicable law, and evidence. An insurance adjuster can take a position during the claim process, but that position is not automatically a final legal determination.
For more information about dealing with adjusters, recorded statements, insurance investigations, and settlement offers, see the guide on Dealing With Insurance Companies.
How Is Fault Actually Determined?
There is no single mathematical formula that determines who is responsible for an accident. Instead, the circumstances are examined and the available evidence is considered as a whole.
Depending on the type of accident, useful evidence can include:
Police or Incident Reports
A police report may contain information about statements made at the scene, observations by the responding officer, citations, road conditions, vehicle positions, and other circumstances surrounding the accident.
A police report can be helpful evidence, but it is not necessarily the final word on civil liability. Officers may arrive after the accident and may have to rely on information provided by the people involved or witnesses.
A police report is one piece of the overall evidence rather than an automatic legal ruling about who was responsible.
Witness Statements
People who actually saw what happened can provide important evidence, particularly when the parties involved remember events differently.
An independent witness may be especially helpful because the witness generally has no financial interest in the outcome of the claim.
A witness also does not necessarily have to see the precise moment of impact or injury to be useful. Someone may have seen what happened immediately before or after the accident, observed a dangerous condition, heard what was said, or seen something else that helps establish the circumstances.
For that reason, it is worth preserving contact information for anyone who may have relevant information.
Photographs and Video
Photographs taken shortly after an accident can sometimes tell an important part of the story.
Depending on the circumstances, useful images might show vehicle damage, the position of vehicles, traffic signs, road conditions, skid marks, debris, property conditions, lighting, visibility, or the precise location where someone fell.
Video can be even more valuable when available. Surveillance cameras, dashcams, security systems, cellphones, doorbell cameras, and other video sources may capture events that would otherwise come down to conflicting recollections.
Because video is often overwritten or deleted, identifying potentially useful video sources soon after an accident can be important.
Electronic and Digital Evidence
Modern accidents can generate evidence that does not necessarily exist in traditional paper records.
Depending on the circumstances, this can include:
- Dashcam footage
- Cellphone video
- Business surveillance footage
- Doorbell-camera footage
- Traffic or intersection video
- Vehicle data or event information
- Photographs stored on phones
- Text messages and other electronic communications
- Electronic records maintained by businesses or other organizations
Not every accident will have this type of evidence, and not every electronic record will establish fault. But when it exists, it can sometimes provide information that is difficult to establish through memory alone.
Physical Evidence
The physical evidence left behind after an accident can sometimes help reconstruct what happened.
Vehicle damage, debris patterns, skid marks, damaged property, road conditions, tire marks, and other physical evidence may help establish the sequence of events.
Physical evidence can become less useful as time passes because vehicles are repaired, damaged property is removed, roads are cleaned, and conditions change.
Traffic Laws and Safety Rules
A violation of a traffic law or applicable safety requirement can be important evidence when determining whether someone acted unreasonably.
For example, running a red light or failing to yield may provide evidence concerning a driver's conduct. In a premises case, evidence that a property owner failed to address a dangerous condition may become important.
The legal significance of a particular violation depends on the circumstances, so simply pointing to a rule violation does not necessarily answer every question about liability.
Expert Analysis
Some accidents are relatively straightforward. Others are not.
When responsibility is heavily disputed or the accident is technically complicated, experts may be used to analyze physical evidence and explain what likely occurred.
Depending on the nature of the claim, this could include accident reconstruction experts, engineers, medical experts, biomechanical experts, vocational experts, or other specialists.
The important point is that fault is generally determined by looking at the entire picture rather than relying on one isolated piece of evidence.
You Do Not Have to Prove Your Personal Injury Case Beyond a Reasonable Doubt
This is another area where people sometimes become confused because they are familiar with criminal trials.
Criminal cases use the demanding "beyond a reasonable doubt" standard because a criminal conviction can result in significant consequences, including imprisonment.
Personal injury cases are civil cases. They generally use a lower standard called preponderance of the evidence.
In simple terms, this means the evidence must establish that something is more likely true than not true.
You generally do not have to prove every detail with absolute certainty. You do not have to eliminate every possible alternative explanation. The question is whether the evidence, considered as a whole, makes your version of events more likely than not.
Who Has to Prove the Case?
Generally, the injured person bringing the claim—the plaintiff—has the burden of proving the elements of the claim.
That generally means establishing the applicable duty, showing that the defendant breached that duty, connecting the breach to the injury, and establishing the damages suffered.
The defendant does not ordinarily have to prove that they were "innocent" in the criminal-law sense. Instead, the plaintiff must present sufficient evidence to establish the civil claim under the applicable legal standard.
This distinction is important because accident victims sometimes assume they need a perfect video, an eyewitness, or irrefutable evidence before they can pursue a claim.
Real-world personal injury cases do not necessarily work that way. Civil cases can be established through a combination of direct and circumstantial evidence.
What Happens When More Than One Person Is at Fault?
Some accidents involve a single obvious source of responsibility. Others involve several potentially responsible people or entities.
Consider a few examples:
- Two drivers may both have contributed to a collision.
- A driver and another motorist may share responsibility for a chain-reaction crash.
- A property owner and a maintenance contractor may both have played a role in a dangerous condition.
- A government entity may potentially share responsibility for a dangerous roadway condition.
- A commercial trucking company and its driver may both become relevant to a truck accident claim.
- Another person or entity may have contributed to an injury even though they were not directly involved in the accident itself.
California has specific rules governing how damages are allocated when multiple defendants or other potentially responsible parties are involved.
One particularly important distinction involves economic damages and non-economic damages. Economic damages can include losses such as medical expenses and lost income. Non-economic damages can include losses such as pain, suffering, and emotional distress.
California's rules regarding multiple defendants can treat these categories differently, making multiple-party cases considerably more complicated than a simple division of the total damages by percentage.
For that reason, determining that "three people were at fault" is only the beginning of the analysis. The legal consequences of that finding depend on the type of damages involved, the parties involved, the applicable legal theories, and the particular circumstances.
What If a Government Entity May Be Responsible?
Claims involving government entities deserve special attention.
A government entity could potentially become involved in a personal injury claim in situations involving a government vehicle, a dangerous roadway or sidewalk condition, a malfunctioning traffic signal, or other circumstances involving government property or operations.
California has special rules governing claims against public entities, including significantly shorter deadlines in many circumstances.
For example, a claim subject to California's government claims presentation requirements generally must be presented within six months of accrual under Government Code section 911.2, although exceptions and additional rules can apply.
That is substantially different from the general deadline that applies to many personal injury claims against private parties.
Government entities may also have specific statutory immunities and defenses that do not apply in the same way to private individuals or businesses.
This does not mean that an injury involving a government entity cannot result in a valid claim. It means that these cases should be identified and investigated promptly because waiting can create serious problems.
If you believe a city, county, state agency, school district, or other public entity may be involved, do not assume that the ordinary personal injury deadline applies.
Comparative Fault Can Look Different Depending on the Accident
The general concept of comparative fault applies broadly, but the arguments surrounding fault can be very different from one type of accident to another.
Car Accidents
In a vehicle collision, the dispute might involve speed, following distance, lane changes, right-of-way, traffic signals, visibility, distracted driving, or other driving conduct.
Sometimes the physical evidence makes the circumstances relatively clear. In other cases, each driver may tell a very different story.
A collision may also involve more than two drivers, making the responsibility analysis more complicated.
Motorcycle Accidents
Motorcycle cases can involve many of the same issues as car accidents, but additional questions may arise concerning visibility, lane positioning, lane splitting, speed, protective equipment, and the actions of other motorists.
An injured motorcyclist should not assume that being on a motorcycle means they are automatically considered responsible for a collision.
Likewise, a motorcyclist's conduct should be considered in the context of the evidence rather than assumptions or stereotypes about motorcycle riders.
Truck Accidents
Truck accidents can involve additional layers of responsibility that may not exist in an ordinary two-car collision.
The investigation may need to consider the truck driver, trucking company, vehicle owner, maintenance responsibilities, cargo loading, dispatching, training, company policies, and other circumstances depending on the accident.
Evidence may include driver records, vehicle information, maintenance records, cargo information, electronic records, photographs, video, and other documentation.
A truck accident can therefore involve questions not only about what the driver did, but also about whether another company or entity had responsibilities that contributed to the collision.
For more information, see the Santa Clarita Truck Accident Guide.
Pedestrian Accidents
In pedestrian cases, an insurance company may focus on where the pedestrian was walking, whether a crosswalk was being used, visibility, traffic signals, and other circumstances.
But the mere fact that someone was not in a crosswalk does not automatically answer the question of fault. The conduct of the driver and the surrounding circumstances still matter.
Likewise, a pedestrian's presence in a crosswalk does not automatically make the driver responsible for every collision. The surrounding facts still need to be examined.
Questions may include the driver's speed, visibility, traffic conditions, lighting, the pedestrian's movements, traffic signals, and what each person could reasonably have seen or done.
Slip-and-Fall Accidents
In a premises liability case, the property owner may argue that the injured person should have seen the condition, was not paying attention, or otherwise contributed to the fall.
The analysis must also consider the condition of the property itself, including whether the responsible party knew or reasonably should have known about the dangerous condition and failed to take reasonable steps to address it.
Evidence can include photographs, surveillance footage, inspection records, maintenance records, incident reports, witness statements, and information about how long the condition existed.
Dog-Bite Cases
Dog-bite claims can involve a different legal analysis because California has a specific strict-liability statute for certain dog bites.
California Civil Code section 3342 generally does not require the same proof of negligence that would ordinarily be required in a traditional negligence claim.
Other dog-related injuries can involve different theories of liability, and issues such as provocation may also become relevant depending on the circumstances.
The important lesson is that you should not assume that the fault analysis from one type of accident automatically applies to another.
If the Other Party Says the Accident Was Your Fault
This is very common after an accident.
You may believe the other driver caused the collision, while the other driver says you caused it. A property owner may say a dangerous condition was obvious. An insurance company may tell you that you were partially responsible.
A disagreement about fault does not, by itself, determine the outcome.
When accounts conflict, the focus generally shifts to the evidence.
What do the photographs show?
What do the witnesses remember?
Is there surveillance footage?
What do the vehicle damage patterns indicate?
What do the police or incident reports say?
Are there traffic laws or other safety requirements that apply?
Are there medical records that help establish when and how the injury occurred?
Are there other documents or electronic records that help reconstruct what happened?
This is one reason it is so important to preserve evidence early.
You also do not need to win an argument with an insurance adjuster during a telephone call. Your goal should be to provide truthful information and preserve the evidence rather than speculate about facts you do not know.
If you are not sure what happened, it is reasonable to say that you do not know or do not remember rather than guessing.
Why Documentation Matters So Much
Fault determinations are often made weeks or months after an accident, when the scene has changed, vehicles have been repaired, surveillance footage may have been erased, and people's memories have become less precise.
That is why the information you preserve shortly after an accident can become extremely valuable later.
If appropriate, consider preserving:
- Photographs and videos from the accident scene
- Photographs of vehicle or property damage
- Contact information for witnesses
- Police or incident reports
- Insurance information
- Relevant text messages or other communications
- Dashcam or surveillance footage
- Information about the location and circumstances of the accident
- Medical records documenting your injuries and treatment
- Receipts and other records relating to accident-related expenses
- Information about nearby businesses or properties that may have surveillance cameras
If you know that a nearby business, residence, traffic camera, or other system may have captured the accident, it can be important to identify that source quickly because some systems automatically overwrite older footage.
You do not have to become an accident reconstruction expert. The goal is simply to preserve information that might help someone later understand what actually happened.
For more information about preserving evidence, see the Evidence and Documentation resource.
The Insurance Company's Fault Assessment Is Not Final
An insurance adjuster may tell you that their investigation shows you were partly responsible. You may even be presented with a specific percentage.
It is important to understand what that statement means—and what it does not mean.
An insurance company's assessment is part of the claim process. It is not automatically a court judgment establishing the legally correct percentage of fault.
If you disagree with the insurer's position, the evidence supporting that position can be examined. The issue may potentially be negotiated or disputed. If a case cannot be resolved, a court or jury may ultimately be asked to determine responsibility based on the evidence presented and the applicable law.
This is another reason to be careful about making statements immediately after an accident that could later be taken out of context.
You should always be truthful, but you also do not need to speculate about facts you do not know.
It is perfectly reasonable to say that you do not know or do not remember something rather than guessing.
For more information about insurance investigations and communications with adjusters, see Dealing With Insurance Companies.
Can I Still Recover Money If I Made a Mistake?
Possibly—and this is where California's comparative negligence system can be particularly important.
Maybe you were driving a little faster than you should have been. Maybe you were looking in a different direction for a moment. Maybe you were walking somewhere other than the route the property owner believes you should have taken.
The existence of some potentially careless conduct does not automatically mean you have no claim.
Instead, the question may become whether your conduct contributed to the accident and, if so, to what extent.
That percentage can matter financially, but "partially at fault" is not necessarily the same thing as "no claim."
The specific facts matter, including what each person did, what each person could reasonably have done, what caused the accident, and what evidence supports the competing versions of events.
How Long Do You Have to Pursue a Personal Injury Claim?
For many personal injury claims against private parties in California, the general deadline to file a lawsuit is two years from the date of the injury under California Code of Civil Procedure section 335.1.
There are important exceptions and special rules, however. Claims involving government entities can have substantially shorter claim-presentation deadlines, and other circumstances can affect when a deadline begins or how it applies.
Do not assume that you have two years simply because you were injured in an accident.
Identifying the applicable deadlines early is important, particularly when a government entity, minor, death, delayed discovery, or another unusual circumstance may be involved.
For more information, see the California Filing Deadlines guide.
Frequently Asked Questions
If I was partly at fault for my accident, can I still recover compensation?
Generally, yes. California follows a pure comparative negligence system, meaning an injured person's recovery can generally be reduced by that person's percentage of fault rather than automatically being eliminated.
The actual result depends on the facts, the applicable legal theories, the damages involved, and the evidence establishing each person's responsibility.
Who decides what percentage of fault I have?
The percentage can be disputed and ultimately determined based on the evidence.
During an insurance claim, an adjuster may take a position regarding fault. If the case proceeds to litigation, responsibility can ultimately be determined by a judge or jury depending on the circumstances.
An insurance company's percentage is therefore not automatically the final legal determination.
What evidence is most important in proving fault?
There is no single type of evidence that is always most important.
Depending on the accident, photographs, video, witnesses, police reports, physical evidence, medical records, traffic laws, safety regulations, electronic records, and expert analysis may all contribute to establishing what happened.
Often, the strongest evidence comes from several different sources that tell a consistent story.
What if there were two or more people responsible for my accident?
That is possible.
California law provides rules for allocating responsibility among multiple defendants and other potentially responsible parties, but the consequences can differ depending on the type of damages, the parties involved, and the legal theories involved.
Multiple-party cases can therefore become considerably more complicated than claims involving one clearly responsible person.
Can an insurance company decide that I was 50 percent at fault?
An insurance company can take that position during its investigation, but its position is not necessarily the final legal determination.
If you disagree, the evidence supporting the percentage can be challenged and negotiated. A disputed case may ultimately be resolved through litigation if the parties cannot reach an agreement.
Do I have to prove my case beyond a reasonable doubt?
No.
"Beyond a reasonable doubt" is the standard generally associated with criminal cases. Personal injury cases are civil matters and generally use the preponderance of the evidence standard.
In simple terms, you generally must establish that your version of events is more likely true than not.
What if there is no video or eyewitness?
A personal injury case does not necessarily fail simply because there is no eyewitness or video.
Other evidence can sometimes establish what happened, including photographs, vehicle damage, physical evidence, medical records, statements made after the accident, police reports, traffic laws, and reasonable inferences from the surrounding circumstances.
The absence of one particular type of evidence does not automatically determine the outcome.
What if I am not sure who was responsible?
That is not unusual, particularly when an accident happens quickly or involves several people or entities.
You do not necessarily need to have the complete legal answer immediately. Gathering information, preserving evidence, obtaining the appropriate reports, and understanding the circumstances can help clarify the responsibility question.
What if the insurance company says I was mostly at fault?
An insurance company's position that you were mostly at fault does not automatically mean that you are legally barred from pursuing a claim.
California's comparative-fault system generally allows responsibility to be divided among the parties. The important questions are what actually happened, what evidence supports each side, and what percentage of responsibility, if any, should legally be assigned to each person or entity.
Do not assume that an adjuster's initial percentage is necessarily the correct one.
Can more than one person or company be legally responsible for my injury?
Yes, depending on the circumstances.
For example, a case could potentially involve multiple drivers, a driver and vehicle owner, a property owner and maintenance company, or a trucking company and driver.
The legal rules governing responsibility can differ depending on the relationship between the parties and the type of claim, which is one reason multiple-party cases can require careful analysis.
The Most Important Thing to Remember About Fault
After an accident, it is tempting to focus on finding someone to blame immediately. But personal injury law generally requires a more careful approach.
The real question is not simply, "Who caused the accident?"
It may involve several questions:
Who owed a duty of care?
Who failed to act reasonably?
What actually caused the accident?
Did anyone else contribute?
Did the injured person contribute?
What evidence supports each side?
What injuries and losses resulted?
Who may legally be responsible for those injuries and losses?
Those questions can take time to answer.
If you have been injured in an accident, you do not need to understand every legal rule before taking the first steps. Start by making sure you are safe, obtain appropriate medical care, preserve available evidence, document what happened, and be careful about making assumptions or admissions about fault before the facts are clear.
Fault Is Only One Part of a Personal Injury Claim
Responsibility is important, but it is only one part of a personal injury case.
Even when another person appears clearly responsible for an accident, there can still be questions about the nature and extent of the injuries, medical treatment, lost income, property damage, future losses, insurance coverage, and other damages.
Likewise, an accident that initially appears to involve shared responsibility may look very different once the evidence is collected.
The best approach is usually to avoid jumping to conclusions in either direction.
Do not automatically assume that you have no claim because someone says you were partly at fault, and do not assume that someone else is entirely responsible simply because the accident initially appears straightforward.
The facts matter.
Fault and Personal Injury Claims in Santa Clarita, CA
These general California principles apply throughout the Santa Clarita Valley, including Santa Clarita, Valencia, Saugus, Newhall, Canyon Country, Stevenson Ranch, and Castaic.
Whether an accident happens on a local street, a freeway, a shopping center, a residential property, or another location, the underlying principles of responsibility are governed by California law.
What changes from case to case is the evidence and the specific circumstances.
A collision at an intersection in Valencia may raise very different factual questions from a fall at a business in Canyon Country or a pedestrian accident in Newhall. The same basic legal framework can apply, but the evidence needed to understand who was responsible may be completely different.
The goal is not simply to determine who appears to be "at fault."
The goal is to understand what happened, who contributed to it, what injuries resulted, and what California law says about responsibility under those particular circumstances.
Need additional information and guidance? Talk to an Attorney.
If you have been injured in an accident and there is a dispute about who was responsible, understanding the evidence and applicable California law can be an important first step.
You do not necessarily need to know the answer to every fault question before seeking guidance. Sometimes the most useful first step is simply understanding what questions need to be answered and what evidence may matter.