Hurt by Another Resident: Facility Duties

When one resident hits, pushes or sexually assaults another, and the resident who did it has dementia, a family may hear that it was nobody's fault. That may explain the other resident's conduct, but it does not answer whether the facility met its own duties. Our nursing home abuse and neglect page covers claims against care facilities generally. This guide explains what a nursing home or assisted living facility must do to protect residents from one another, what it must report, and how a claim is evaluated.

The same questions arise in skilled nursing, assisted living and memory care, but the rules differ by license. Our guide on who regulates nursing homes and assisted living explains the difference. The elder abuse laws apply to both.

What happens after one resident hurts another, step by step?

Safety and medical care. Your parent should be examined, and the two residents separated. If the injury is serious or a crime may have occurred, call 911.
Staff must report it. Staff who see or suspect abuse in a long-term care facility are mandated reporters with short deadlines, set out in the table below (Welfare and Institutions Code 15630).
A nursing home also reports to the state. A long-term health care facility must report every incident of alleged or suspected abuse of a resident to the Department of Public Health immediately, or within 24 hours, and failing to do so is a class B violation (Health and Safety Code 1418.91).
The facility must investigate and protect. Under federal rules that California applies to every skilled nursing facility, the facility must thoroughly investigate, prevent further abuse while the investigation is in progress, and report the results to the state survey agency within 5 working days (42 CFR 483.12(c); Health and Safety Code 1599.1(i)).
The reports travel. The ombudsman and local law enforcement forward reports about nursing homes to the Department of Public Health and about assisted living to the Department of Social Services, and report physical abuse to the district attorney (Welfare and Institutions Code 15630(b)(1)(D)).
The family can file its own complaint. For Sonoma and Marin County nursing homes, the Department of Public Health's Santa Rosa office, (707) 576-6775. For assisted living, the Department of Social Services' Santa Rosa Adult and Senior Care Regional Office, (707) 588-5026, or 844-538-8766. Our Sonoma County page lists other local agencies.
Then the claim is evaluated against the facility's duties, described below.

Who must report, how fast, and to whom?

Situation	Who reports	Deadline and recipients	Source
The other resident has dementia diagnosed by a physician, and there was no serious bodily injury	Staff and other mandated reporters	Written report within 24 hours to the long-term care ombudsman and local law enforcement	Welfare and Institutions Code 15630(b)(1)(A)(i)
All other abuse in a long-term care facility	Staff and other mandated reporters	Phone report to local law enforcement immediately, no later than 2 hours; written report within 24 hours to the ombudsman, law enforcement and the state licensing agency	Welfare and Institutions Code 15630(b)(1)(A)(ii)
Any alleged or suspected abuse in a nursing home	The facility	To the Department of Public Health immediately, or within 24 hours	Health and Safety Code 1418.91
Alleged abuse, or an event causing serious bodily injury, in a nursing home	The facility	To the administrator and state officials no later than 2 hours after the allegation; otherwise within 24 hours; investigation results within 5 working days	42 CFR 483.12(c)(1) and (4)

The dementia rule changes where the reports go and how fast; it does not mean the incident is not abuse. The law still treats it as a reportable instance of abuse.

When is the facility responsible?

The facility is not automatically liable because one resident hurt another. It is responsible when its own conduct fell short. Under the Elder Abuse Act, neglect includes the failure of a caregiver to protect a resident from health and safety hazards (Welfare and Institutions Code 15610.57(b)(3)), and a resident who has already shown aggression can be that kind of hazard for the people around them. The jury instruction asks whether the facility, through its employees, failed to use the care a reasonable person in the same situation would use, and whether that failure was a substantial factor in causing harm (CACI 3103).

The duties are specific. A nursing home must develop and carry out written policies that prohibit and prevent abuse of residents, and residents have the right to be free from abuse (42 CFR 483.12), rights that California applies to every skilled nursing facility regardless of payment source (Health and Safety Code 1599.1(i)). The facility must also employ an adequate number of qualified personnel (Health and Safety Code 1599.1(a)). In assisted living, residents have the right to be free from physical abuse and neglect, to dignity in their relationships with other residents, and to care and supervision by staff sufficient in numbers and skill to meet their needs (Health and Safety Code 1569.269(a)(1), (6) and (10)).

The key evidence is in the facility's own files: the other resident's history of incidents, the care plans for both residents, what staff wrote after earlier episodes, room assignments, and staffing on the shift. A decision the Judicial Council cites under CACI 3103 says that a violation of staffing regulations "may provide a basis for finding neglect."

Is it "abuse" if the other resident has dementia?

For reporting purposes, yes. The Act's definition of physical abuse includes assault and battery as defined in the Penal Code, and sexual assault (Welfare and Institutions Code 15610.63), and abuse of an elder includes physical abuse with resulting physical harm, pain or mental suffering (Welfare and Institutions Code 15610.07). The reporting statute itself treats harm caused by a resident with dementia as a "known, suspected, or alleged instance of abuse" that must be reported, just through a different route (Welfare and Institutions Code 15630).

For a civil claim, the focus is on the facility. Whether a resident with dementia can be personally liable is a separate question, and it does not decide whether the facility protected your parent. How businesses can be responsible for assaults by third parties in other settings, such as bars, stores and apartments, is covered in our guide on when a business is responsible for an assault on its property.

What changes the answer?

The facility is assisted living, not a nursing home. The 24-hour facility report in section 1418.91 applies to long-term health care facilities such as skilled nursing and intermediate care facilities (Health and Safety Code 1418), not to assisted living. Assisted living staff still have mandated reporter duties, and the state can impose a $10,000 penalty for a violation it determines constitutes physical abuse (Health and Safety Code 1569.49(f)).

There were earlier incidents. A nursing home must prevent further potential abuse while an investigation is in progress (42 CFR 483.12(c)(3)). A second attack by the same resident after an earlier report raises the question of what the facility did in between.

A roommate was the attacker. Assisted living residents are entitled to reasonable accommodation of room and roommate preferences, and a facility may change rooms without 30 days' notice when necessary due to an emergency (Health and Safety Code 1569.269(a)(17) and (18)). Leaving a known aggressor in the same room raises the question of why the facility did not use that exception.

A staff member, not a resident, caused the harm. That is physical abuse by a caregiver. The facility can be responsible for its employees, and for the Act's added remedies against an employer the standard in Civil Code 3294(b) must be met (Welfare and Institutions Code 15657(c)); see what the Elder Abuse Act adds to a claim.

Your parent was wandering when it happened. Supervision of residents with dementia is its own duty; see a resident with dementia who wandered from memory care.

Your parent died. Elder Abuse Act claims are not limited by the 2026 rule on pre-death pain and suffering (Code of Civil Procedure 377.34(f)); see elder abuse claims after a parent has died.

What could this look like? An example

For example, imagine an 88-year-old woman in a skilled nursing facility in Santa Rosa. A new resident with diagnosed dementia is moved into the room next door. The nursing notes record that he shoved an aide in his first week and entered other residents' rooms at night twice, and his care plan is not changed. Ten days later he enters her room at 2 a.m. and pushes her, and she falls and breaks her wrist. One aide is covering the hall.

The other resident has dementia, but a broken wrist that needs medical treatment can be "serious bodily injury" under the Act, which includes an injury requiring medical intervention (Welfare and Institutions Code 15610.67). If so, the dementia exception does not apply: staff must call law enforcement within 2 hours and send written reports within 24 hours, and the facility must report the incident to the Department of Public Health. Her son asks for her chart and files his own complaint with the Santa Rosa office. A lawyer reviewing the case would focus on the earlier incidents, the unchanged care plan, the night staffing, and whether the facility protected residents after the first warning signs. A residents' rights claim under Health and Safety Code 1430(b) could also be considered. This example is made up to show how the rules fit together; it says nothing about any real case.

What mistakes do families make after a resident-on-resident incident?

Accepting "he has dementia, it's nobody's fault" as the end of the conversation.
Not asking in writing whether the incident was reported, when and to whom.
Not asking whether the other resident had earlier incidents and what the facility did about them.
Leaving a parent next to or in the same room as the other resident without asking for a change.
Waiting to get the records; an injury claim generally must be filed within two years (Code of Civil Procedure 335.1).

What should we do this week?

Make sure your parent has been examined and keep every medical record from the incident.
Ask the administrator in writing what happened, who saw it, and whether and when it was reported to the ombudsman, law enforcement and the state.
Ask what the facility has done to keep the other resident away from your parent while it investigates.
Request your parent's chart, including incident notes and care plan changes.
File your own complaint with the licensing agency and call the county ombudsman: (707) 526-4108 in Sonoma County, (415) 473-7446 in Marin County.
Read what to do this week if you suspect nursing home neglect. Note the deadlines in how long a family has to bring an elder abuse claim.

Frequently asked questions

Can the facility be penalized for not reporting?

Yes. A nursing home's failure to make the 24-hour report is a class B violation (Health and Safety Code 1418.91), which for a skilled nursing facility carries a civil penalty of $150 to $3,000 (Health and Safety Code 1424.5).

Does the facility have to tell us about the incident?

A nursing home must immediately inform the resident, consult the resident's doctor and notify the resident's representative after an accident that causes an injury with the potential to need a doctor's care (42 CFR 483.10(g)(14)), a rule California applies to every skilled nursing facility (Health and Safety Code 1599.1(i)). Ask in writing what was reported to the state and when.

Should we call the police?

If your parent was seriously hurt or sexually assaulted, yes. Reports of physical abuse are also forwarded to the district attorney (Welfare and Institutions Code 15630(b)(1)(D)(v)).

Is a residents' rights claim available?

For a skilled nursing or intermediate care facility, yes: residents have the right to be free from abuse, and the licensee can be liable for up to $500 per violation plus costs and attorney's fees (Health and Safety Code 1430(b)). See the residents' rights claim against a nursing home.

What if the facility says it could not have predicted the attack?

That is a factual question. The records of earlier incidents, care plans and staffing show what the facility knew and when, and those are what the claim is measured against (CACI 3103).

Does the 2026 records rule apply here?

It can. If a covered care facility intentionally destroys or alters evidence, a court may lower the standard of proof for the Act's added remedies (Welfare and Institutions Code 15657.02). See what changed in 2026 when a care facility destroys records.

If your parent was hurt by another resident in a care facility, contact Young Law Group today at (707) 343-0556 or through our contact page for a free consultation.

My parent was hurt by another resident: is the facility responsible?