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Hospital nurse-to-patient ratios by state
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Four states put hospital nurse-to-patient ratios in law, in two different shapes: California and Oregon set numbers unit by unit, while Massachusetts and New York set one only for intensive and critical care. Most other states require a process instead — a staffing committee, a written plan, a disclosure, or a general duty to staff adequately. Before you copy a number into a staffing grid, find out which of those your state actually has, and read the clauses around the number — they decide whether a schedule complies.
What the law actually says
There is no federal hospital nurse-to-patient ratio. The Medicare condition of participation requires only "adequate numbers of licensed registered nurses, licensed practical (vocational) nurses, and other personnel to provide nursing care to all patients as needed."Source: 42 CFR § 482.23(b)
The same rule makes the director of nursing responsible for "determining the types and numbers of nursing personnel and staff necessary to provide nursing care for all areas of the hospital."Source: 42 CFR § 482.23(a)
California sets licensed nurse-to-patient ratios by unit in regulation: 1:2 in critical care and post-anesthesia recovery, 1:3 step-down, 1:4 in the emergency department, telemetry, pediatrics and specialty care, 1:5 medical/surgical, and 1:6 psychiatric.Source: Cal. Code Regs. tit. 22, § 70217 (CDPH)
California forbids averaging: "There shall be no averaging of the number of patients and the total number of licensed nurses on the unit during any one shift nor over any period of time."Source: Cal. Code Regs. tit. 22, § 70217 (CDPH)
Massachusetts sets one hospital ratio and only for intensive care — "1:1 or 1:2 depending on the stability of the patient as assessed by the acuity tool" and by the staff nurses in the unit.Source: M.G.L. c. 111, § 231
New York sets a minimum for critical care patients: "There shall be a minimum of one registered professional nurse assigned to care for every two patients that an attending practitioner determines to require intensive or critical care", applied on patient acuity "and not solely based on the location of the patient."Source: 10 NYCRR § 405.22(a)(5)
Oregon put ratios for 12 unit types into statute in 2023. Hospitals had to comply by June 1, 2024, and the medical-surgical ratio tightened from 1:5 to 1:4 on July 1, 2026.Source: Oregon HB 2697 (2023), §§ 6, 29, 33
Oregon also caps assistant assignments: a hospital "may not assign a certified nursing assistant to more than seven patients at a time during a day or evening shift or to more than 11 patients at a time during a night shift."Source: Oregon HB 2697 (2023), § 8
The American Nurses Association groups state approaches into three families: nurse-led staffing committees, "mandated nurse to patient ratios or standards, in legislation or regulation", and "mandated disclosure of staffing levels, to the public and/or regulatory bodies." Its own list of which states fall where is dated March 2022.Source: American Nurses Association, Advocating for Safe Staffing
Turning a ratio into a staffing grid
A ratio is a ceiling on assignment, not a headcount for a shift. It tells you the largest number of patients one licensed nurse may hold at a given moment. It does not tell you how many nurses to roster, because that depends on census, the length of your shifts, breaks, admissions and discharges, and how many of the people on the unit are actually doing direct patient care.
Two clauses do most of the work. The first is whether averaging is allowed: California's is a moment-by-moment maximum, so a unit cannot be short at 3pm and even out by 9pm. The second is who counts: California counts nurse managers and charge nurses only while they are providing direct patient care, and excludes the triage nurse in an emergency department from the ratio entirely. A grid that counts the charge nurse as a body all shift will look compliant and will not be.
If your state has no ratio, you are not off the hook — you are on the hook for a defensible process instead. That usually means a committee-approved staffing plan, a record of when the unit deviated from it, and evidence that you looked.
Four states set numbers; the rest set a process
The American Nurses Association groups state approaches into three families: nurse-led staffing committees, mandated ratios or standards in legislation or regulation, and mandated disclosure of staffing levels to the public or to regulators. A state can use more than one. Oregon uses all three.
Approach
What the state requires
What it means for a scheduler
Numeric ratios
A maximum number of patients per licensed nurse, by unit, fixed in statute or regulation.
The ratio becomes a hard constraint on every assignment. Build it into the grid and check it per shift, not per month.
Staffing committee
A nurse-led committee adopts a written staffing plan for the hospital; management cannot set it alone.
Your plan is the standard you are measured against. Deviating from it is the reportable event, not falling below someone else's number.
Public disclosure
Staffing levels must be reported to the public, a regulator, or both.
The schedule and the record of what was actually worked become externally visible. Reconstruction after the fact is the expensive path.
General duty only
Federal conditions of participation, plus accreditation and any state licensure language.
No number to hit, but you still have to be able to explain the staffing decision you made and show the evidence for it.
ANA's published list of which states fall into which family is dated March 2022 and names only California and Massachusetts under ratios. It predates Oregon's 2023 ratio law, and it does not include New York's intensive and critical care minimum, which sits inside the state's hospital regulations rather than in a standalone staffing statute. Use the categories from ANA; get the numbers from your own state's current statute or regulation, not from a summary.
California: the ratios, unit by unit
California's ratios sit in Title 22 of the California Code of Regulations, section 70217. "Licensed nurse" means a registered nurse, a licensed vocational nurse, and — in psychiatric units only — a psychiatric technician. Every ratio below is a maximum "at all times".
Unit
Licensed nurse-to-patient ratio
Note
Critical care (ICU, burn, coronary, acute respiratory, intensive care newborn nursery)
1:2
The intensive care newborn nursery requires 1 registered nurse to 2 or fewer infants.
Emergency department
1:4
Plus a separate triage RN, a 1:2 limit for ED critical care patients, and 1:1 RN coverage for critical trauma.
Post-anesthesia recovery
1:2
Regardless of the type of anesthesia the patient received.
Step-down
1:3
Tightened from 1:4 on January 1, 2008.
Telemetry
1:4
Tightened from 1:5 on January 1, 2008.
Specialty care
1:4
Tightened from 1:5 on January 1, 2008.
Pediatrics
1:4
Medical/surgical
1:5
Tightened from 1:6 on January 1, 2005.
Psychiatric
1:6
Psychiatric technicians and LVNs together may not exceed 50 percent of the licensed nurses on the unit.
Labor and delivery
1:2 in active labor; 1:4 antepartum not in active labor
Postpartum
1:4 mother-baby couplets; 1:6 mothers only
With multiple births, mothers plus infants assigned to one nurse never exceeds eight.
Combined labor/delivery/postpartum
1:3
For the mixed assignment; single-category assignments use the ratios above.
Operating room
One circulating RN plus one scrub assistant per patient-occupied room
The scrub assistant may be a licensed nurse, an OR technician, or another person the hospital has found competent.
The regulation is explicit that these are a floor, not a target: additional staff "shall be assigned in accordance with the hospital's documented patient classification system", which weighs severity of illness, equipment, complexity of clinical judgement, and ability to self-care.
Oregon: the ratios, unit by unit
Oregon's ratios come from HB 2697 (2023) and apply to direct care registered nurses. The emergency department rule is written differently from the rest — it is an average over a shift with a hard ceiling on any one moment.
Unit
Direct care RN-to-patient ratio
Emergency department
Averages no more than 1:4 over a 12-hour shift, and no single RN assigned more than five patients at one time; not more than one trauma patient per RN, and RNs assigned to trauma patients are left out of the average
Intensive care
1:2
Labor and delivery
1:2 if not in active labor and without complications; 1:1 in active labor or at any stage of labor with complications
Postpartum, antepartum, well-baby nursery
1:6, counting mother and baby as separate patients
Mother-baby unit
1:8, counting mother and baby as separate patients
Operating room
1:1
Oncology
1:4
Post-anesthesia care
1:2
Intermediate care
1:3
Medical-surgical
1:4 since July 1, 2026 (1:5 before that date)
Cardiac telemetry
1:4
Pediatrics
1:4
Certified nursing assistants have their own cap: seven patients on a day or evening shift, eleven at night. Psychiatric units are staffed through a subcommittee of the hospital nurse staffing committee rather than by the Section 6 numbers, and the ratios also do not apply to several defined groups, including emergency department patients in critical condition until they are stable and inpatients who are ready for discharge but held by a documented discharge barrier.
The clauses that decide whether you actually comply
The number is the easy part. These are the provisions that turn a plausible-looking grid into a violation.
Clause
Where
What it changes
No averaging
California
Compliance is tested at every moment of every shift. A short hour is a short hour; a good week does not cure it.
Only direct care counts
California
Nurse administrators, supervisors, managers and charge nurses count toward the ratio only while providing direct patient care.
Break relief is named
California
A competent manager or charge nurse may relieve nurses during breaks and meals. Someone has to be scheduled to do it.
The triage nurse is excluded
California
The RN assigned to triage does not count in the emergency department ratio, so the ED needs that assignment on top of the ratio.
Skill mix is capped
California
LVNs may be up to 50 percent of the licensed nurses assigned to patient care on a unit, with exceptions where RNs are required.
Competence before assignment
California
A nurse may not be assigned to a unit unless the hospital has determined current competence and given orientation to that clinical area. Float assignments are constrained by this, not just by headcount.
The unit's name does not matter
California
"Identifying a unit by a name or term other than those used in this subsection does not affect the requirement to staff at the ratios identified."
Deviations are counted and reported
Oregon
A unit may deviate from the staffing plan within a 12-consecutive-hour period no more than six times in a rolling 30 days; the unit manager must notify the committee within 10 days, and each further deviation is a separate violation.
Charge nurse assignments are conditional
Oregon
A charge nurse may take assignments, including covering breaks, in units of 10 or fewer beds — or in larger units only with committee approval.
The patient's classification travels
Oregon
An individual patient's ratio follows the practitioner's documented classification regardless of which unit the patient is in.
Where ratio compliance breaks
Treating "Massachusetts has nurse ratios" — or New York's — as a general rule. Both cover intensive and critical care only: Massachusetts is 1:1 or 1:2 depending on the hospital's acuity tool, and New York is one registered professional nurse for every two patients an attending practitioner determines require that level of care.
Applying a long-term care staffing number to a hospital, or the reverse. They are different rule sets with different measures, and a hospital ratio is not stated in hours per patient day.
Counting the charge nurse, the triage nurse or a manager as a body for a whole shift when the rule counts them only while they are giving direct care.
Averaging across a shift or a pay period in a state where the rule is an at-all-times maximum.
Forgetting break and meal relief. A unit that meets the ratio with everyone on the floor does not meet it at 2am when two nurses are at lunch.
Floating a nurse to fill a gap without the competence and orientation determination the rule requires for that clinical area.
Quoting a ratio from a summary written before the last amendment. Oregon's medical-surgical ratio changed on July 1, 2026, and older write-ups still say 1:5.
Put the rule in the schedule, not in the audit
Shiftd holds coverage rules by role and unit, checks a schedule against them before it is published, and warns on running hours and overtime. It keeps an audit record of who changed what and when. It does not read your census or classify patient acuity — those stay with your clinical systems and your staffing committee.
Which states have hospital nurse-to-patient ratios?
California sets ratios by unit in regulation, and Oregon put ratios for 12 unit types into statute in 2023. Massachusetts and New York each set one number, for intensive and critical care only: Massachusetts 1:1 or 1:2 depending on the hospital's acuity tool, New York one registered professional nurse for every two patients an attending practitioner determines require intensive or critical care. Other states regulate through staffing committees, written staffing plans, public disclosure, or a general adequacy duty rather than numbers.
Is there a federal nurse-to-patient ratio for hospitals?
No. The Medicare condition of participation requires "adequate numbers" of nursing staff and 24-hour nursing services furnished or supervised by a registered nurse, and it leaves the types and numbers to the director of nursing. Federal ratio bills have been introduced repeatedly; none is law.
What is the nurse-to-patient ratio in an ICU?
In California, 1:2 in critical care units. In Oregon, 1:2 in intensive care. In Massachusetts, 1:1 or 1:2 depending on the patient's stability as assessed by the hospital's acuity tool. In New York, a minimum of one registered professional nurse for every two patients an attending practitioner determines require intensive or critical care, applied on acuity rather than solely on which unit the patient is in. Where a state sets no number, the unit's staffing plan governs.
What is the medical-surgical nurse-to-patient ratio?
California requires 1:5 or fewer at all times. Oregon requires 1:4 as of July 1, 2026; it was 1:5 before that date. Among the states whose statutes and regulations are cited in this guide, those two are the only ones that set a medical-surgical number — Massachusetts and New York cover intensive and critical care only. Check your own state's current rules rather than assuming there is no number.
Do staffing ratios apply during breaks?
In California, yes — there is no averaging and the ratio is a maximum at all times, and the regulation expressly allows a competent manager or charge nurse to relieve nurses during breaks and meals. Plan the relief as part of the grid rather than hoping the unit absorbs it.
What happens if a unit goes below the ratio?
It depends on the state's enforcement design. Oregon counts deviations: a unit may deviate within a 12-hour period no more than six times in a rolling 30 days, the manager must notify the staffing committee within 10 days, and each further deviation is a separate violation. That makes the record of deviations as important as the schedule itself.
Does a ratio tell me how many nurses to hire?
No. It caps the assignment one nurse may hold at a moment. Headcount depends on census, shift length, relief for breaks, admissions and discharges, and how much of your licensed time is spent off the floor. Work from coverage hours per post and then test the result against the ratio.
