About OSHA Lookup methodology, sources, limits

What this is

A preview tool for finding U.S. work establishments by their reported workplace injury and illness record. The intended audience is workers researching prospective employers, journalists, lawyers, organizers, and anyone with a transactional reason to ask "is this place dangerous to work at."

Data source

OSHA's Injury Tracking Application (ITA) 300A Summary Data, calendar year 2024 filings. The ITA dataset is what U.S. employers are required to submit annually under 29 CFR 1904.41. Coverage:

• Establishments with 250+ employees across all industries.
• Establishments with 20+ employees in higher-hazard NAICS (construction, manufacturing, healthcare, warehousing, retail, etc.).
• Excludes federal/state/local government and several other categories with separate reporting paths.

Total establishments reporting for 2024: about 400,000. About 230,000 reported zero injuries.

What's included

This site shows the subset of reporting establishments with a notable 2024 safety record. An establishment is included if ANY of:

• Any workplace fatality (the total_deaths field > 0).
• DART rate ≥ 5.0 (about 3× the national average across all industries).
• 50+ cases combining days-away-from-work (DAFW) + days-job-transferred-or-restricted (DJTR).
• Hours worked ≥ 2,000,000 (≈ 1,000 FTE) AND DART ≥ 1.5 — large employers with measurable risk.

Result: 71628 establishments in v0.1, about 18% of the reporting universe.

OSHA injury rate math

OSHA standardizes injury rates to per 100 full-time-equivalent workers per year, which equals 200,000 hours worked. The three standard rates:

• TRIR = (fatalities + DAFW + DJTR + other recordable) × 200,000 / hours worked. The total recordable rate.
• DART = (DAFW + DJTR) × 200,000 / hours worked. Days away + restricted/transferred. The most-cited safety benchmark.
• DAFW = DAFW × 200,000 / hours worked. Days-away rate only.

National 2024 averages (BLS estimate, all private industry): TRIR ≈ 2.7, DART ≈ 1.7.

What this does NOT show

• Inspections / citations / penalties. The other half of OSHA enforcement data. A future version may add this from OSHA's Inspection table (DOL v4 API: OSHA_inspection / OSHA_violation). For now: this is self-reported injury data, not enforcement record.
• Small employers. Most U.S. businesses fall under the ITA reporting threshold and are not in this dataset at all.
• Government workplaces. Federal/state/local government have separate reporting paths (and many smaller agencies don't show up).
• Contractor injuries. Injuries to contractors working at a host establishment are typically credited to the contractor's own filing, not the host. Heavy-construction sites can look quieter than they are.
• Under-reporting. 300A is self-report. OSHA recordkeeping audits find regular under-reporting; the BLS Survey of Occupational Injuries and Illnesses (SOII) generally captures more than ITA.

About

OSHA Lookup is built by Claude (Anthropic's AI model) using public OSHA data. Source code and methodology are open; corrections welcome. See the byclaude lab for context on what's being shipped and why.

OSHA Lookup · workplace-injury data from OSHA ITA 300A 2024 · About / methodology