What Triggers a Cal/OSHA Inspection
Cal/OSHA opened 42,309 California inspections from 2020 through 2025, per federal enforcement data. Accident investigations were the largest group at 31%, complaints second at 24% — and planned inspections, arriving with no trigger at all, were third at 21%.
Cal/OSHA does not publish a breakdown of why its inspections happen. This page is that breakdown — CompliantCA’s analysis of the federal enforcement data, covering the 42,309 California inspections Cal/OSHA opened from January 2020 through December 2025, categorized by the inspection type recorded on each.
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The triggers, 2020–2025
“Cited” is the share of inspections opened 2020–2024 (mature enough to have concluded) that produced at least one citation; “citations when cited” is the average count on those that did.
| Trigger | Inspections | Share | Cited | Citations when cited |
|---|---|---|---|---|
| Accident investigation | 13,287 | 31% | 70% | 2.5 |
| Complaint | 9,946 | 24% | 58% | 2.8 |
| Planned (programmed) | 8,942 | 21% | 70% | 3.9 |
| Referral | 3,468 | 8% | 71% | 2.0 |
| Related (unprogrammed) | 3,071 | 7% | 59% | 2.5 |
| Fatality / catastrophe | 2,192 | 5% | 58% | 3.0 |
| Follow-up | 730 | 2% | 38% | 1.6 |
| Related (programmed) | 641 | 2% | 56% | 2.3 |
Reading the table
Most inspections follow an event — but a fifth follow a plan. Accidents, complaints, referrals, and fatalities together account for about two-thirds of openings. Planned inspections — no event, no complaint, selected by the agency — are 21%, and they are the most thorough kind: as likely to cite as an accident investigation (70%), and averaging 3.9 citations when they do, the highest of any trigger.
Follow-ups mostly find things fixed. Only 38% of follow-up inspections produced a citation, the lowest of any type — evidence that abatement, once done, holds up.
Most inspections are narrow. 86% of the 42,309 inspections were partial in scope; only 9% were complete inspections of the whole workplace. An inspection is usually about something specific — which is also why the records behind one program element can decide it.
The trigger mix by industry
The statewide mix hides sharp industry differences. Share of each industry’s inspections opened 2020–2025, by trigger (accident includes fatality/catastrophe; programmed includes related-programmed):
| Industry | Inspections | Complaint | Accident | Programmed | Referral |
|---|---|---|---|---|---|
| Construction | 11,954 | 17% | 32% | 20% | 17% |
| Manufacturing | 6,054 | 20% | 41% | 27% | 3% |
| Agriculture | 3,729 | 24% | 32% | 26% | 12% |
| Health care | 1,685 | 34% | 45% | 17% | 1% |
| Trucking & warehousing | 1,547 | 27% | 45% | 19% | 1% |
| Restaurants | 1,380 | 54% | 19% | 21% | 4% |
| Landscaping | 1,107 | 11% | 46% | 12% | 27% |
| Auto repair | 925 | 19% | 15% | 61% | 4% |
Two rows stand out. Restaurants are complaint-driven: 54% of restaurant inspections started with a complaint — someone called. Auto repair is program-driven: 61% of auto shop inspections were planned by the agency, the trigger no shop can avoid by staying quiet.
Cal/OSHA has an inspection season
Pooled over 2020–2025, inspection openings peak in late summer — September (4,213), August (4,146), July (4,125) — and bottom out in November (2,827). Half again as many inspections open in September as in November. The ramp tracks the season when §3395, heat illness prevention, is enforced hardest — and §3395 is the second most-cited standard statewide in this data.
What follows the knock is its own subject: What Happens After a Cal/OSHA Inspection Opens — citation odds, the months-long wait, and the appeal clock.
Methodology
CompliantCA computed this analysis from the U.S. Department of Labor enforcement dataset (the OSHA Information System), which includes Cal/OSHA because California operates an OSHA-approved State Plan. Scope: California inspections with open dates January 2020 through December 2025, categorized by the dataset’s inspection-type code; citation shares use inspections opened through 2024 so slow-concluding cases don’t understate the rates. The type mix reconciles with DIR’s own inspection overview within a few percent per category; small differences reflect counting windows. Data as retrieved 2026-08-21. Also from this dataset: citations by employer size and the most-cited-violations series linked in the table above.
An inspection count says what happened, not what any employer must do — the standards themselves say that.
Frequently asked questions
What are the most common reasons for a Cal/OSHA inspection?
In the federal enforcement data for 2020 through 2025, accident investigations account for 31% of California inspections opened, complaints 24%, planned (programmed) inspections 21%, referrals 8%, and fatality/catastrophe investigations 5%. The remainder are related and follow-up inspections.
Can Cal/OSHA inspect a business without a complaint or accident?
Yes. Planned (programmed) inspections — selected by the agency rather than triggered by an event — were 21% of California inspections opened from 2020 through 2025, and 70% of them produced at least one citation, averaging 3.9 citations when they did. In some industries the share is far higher: 61% of auto repair inspections were programmed.
When do Cal/OSHA inspections happen most?
Late summer. Pooled over 2020 through 2025, September (4,213 openings), August (4,146), and July (4,125) are the peak months for California inspection openings; November (2,827) is the lowest. The summer ramp tracks heat-illness enforcement season.