Workers' compensation information system (WCIS)
Workers’ Compensation Claims by Region and County
First Reports of Injury (FROIs) submitted by Trading Partners to the Workers’ Compensation Information System (WCIS) captures location information about California’s workers’ compensation claims. Three data elements on location are the postal code of the accident/injury site; the employer’s complete address; and, the employee’s address.
The tables, charts and reports below are taken from the postal codes of each of three data elements. The numbers reflect the WCIS database information as of the run date of the report.
Percent of FROIs Reported by County of Accident Location in 2025
| CALIFORNIA COUNTY | 2025 FROI | 2025 Employment (EDD)* | Percent FROIs | Percent Employment (EDD) | Rate of Injury to Employment per 100 employees |
|---|---|---|---|---|---|
| Totals, California | 663,589 | 18,824,000 | 100.0% | 100.0% | 3.5 |
| LOS ANGELES | 167,299 | 4,833,300 | 25.21% | 25.7% | 3.5 |
| SAN DIEGO | 54,505 | 1,641,300 | 8.21% | 8.7% | 3.3 |
| ORANGE | 53,358 | 1,675,400 | 8.04% | 8.9% | 3.2 |
| SAN BERNARDINO | 42,484 | 1,039,400 | 6.40% | 5.5% | 4.1 |
| RIVERSIDE | 39,894 | 1,193,000 | 6.01% | 6.3% | 3.3 |
| ALAMEDA | 28,418 | 868,600 | 4.28% | 4.6% | 3.3 |
| SANTA CLARA | 27,503 | 1,448,000 | 4% | 7.7% | 1.9 |
| SACRAMENTO | 26,657 | 789,000 | 4.02% | 4.2% | 3.4 |
| FRESNO | 17,402 | 481,800 | 3% | 2.6% | 3.6 |
| KERN | 15,854 | 428,300 | 2.39% | 2.3% | 3.7 |
*California Employment and Development Department (EDD) Labor Market Information (LMI) Local Area Unemployment Statistics Annual Average, updated May 1, 2026.
Annual Reports by Location
| Report Year | Report Group | Table Number | Table Name |
|---|---|---|---|
| 2025 | Annual Aggregate Region and County Reports | 7 | Workers' compensation claims by region |
| 2025 | Annual Aggregate Region and County Reports | 7a | Workers' compensation claims by region and county |
August 2026