792 California Plumbing Contractors Are Working on an Expired License
An analysis of all 18,172 plumbing contractor licenses published by the California Contractors State License Board, as of August 18, 2026.
CSLB republishes its full licensee file daily. We loaded every plumbing contractor record and compared the expiration date on each against today's date. 792 licenses, 4.4% of the trade, have already lapsed.
Counties with the highest expiry rate
Ranked among counties with at least 50 licensed plumbing contractors.
| County | Licensed | Expired | Rate |
|---|---|---|---|
| Tulare County | 69 | 6 | 8.7% |
| El Dorado County | 96 | 8 | 8.3% |
| Stanislaus County | 146 | 10 | 6.8% |
| San Bernardino County | 600 | 39 | 6.5% |
| Merced County | 63 | 4 | 6.3% |
| Placer County | 206 | 13 | 6.3% |
| Alameda County | 363 | 21 | 5.8% |
| San Luis Obispo County | 163 | 9 | 5.5% |
| Sonoma County | 282 | 15 | 5.3% |
| Kern County | 181 | 9 | 5.0% |
Method
Source file: CSLB public license listing, downloaded
August 18, 2026. A license counts as expired when its published expiration
date is earlier than the date of analysis. We do not adjust for grace periods, so a licensee
who renewed today may still appear here until the next daily file. Counties with fewer than
50 licensees are excluded from the ranking to avoid small-sample noise.