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Licensed boiler contractors in Southern California
Every CSLB C-4 license with a business address in Los Angeles, Orange, San Diego, Riverside or San Bernardino County, from CSLB data updated 10/22/2026.
By county
Los Angeles County has the most, 93 of 208 (44.7%).
| County | Licenses | Active | Share of SoCal |
|---|---|---|---|
| Los Angeles County | 93 | 90 | 44.7% |
| Orange County | 44 | 41 | 21.2% |
| San Diego County | 43 | 41 | 20.7% |
| Riverside County | 19 | 18 | 9.1% |
| San Bernardino County | 9 | 9 | 4.3% |
Boiler, Hot Water & Steam (C-4) by city
- Los Angeles 15
- San Diego 14
- El Cajon 10
- Cypress 7
- Anaheim 6
- Pasadena 5
- Santa Ana 5
- Oceanside 4
- Torrance 4
- Poway 3
- Whittier 3
- Murrieta 3
- Garden Grove 3
- Lake Elsinore 3
- Huntington Beach 3
- Fullerton 3
- North Hollywood 3
- Downey 3
- Paramount 3
- Burbank 3
- Mira Loma 3
- Placentia 3
- Canyon Country 3
- Chula Vista 2
- Costa Mesa 2
- La Verne 2
- Brea 2
- National City 2
- Escondido 2
- Riverside 2
- Irvine 2
- Signal Hill 2
- Ontario 2
- La Jolla 2
- Sun Valley 2
- Covina 2
- Newport Beach 2
- Azusa 2
- Arcadia 2
- Santa Fe Springs 2
- Lancaster 2
- Fontana 2
- Van Nuys 2
- Altadena 2
- Norco 2
- South Gate 2
- Buena Park 2
- Fountain Valley 1
- Alpine 1
- Long Beach 1
- West Hollywood 1
- Los Alamitos 1
- La Puente 1
- Cerritos 1
- Lemon Grove 1
- Menifee 1
No new licenses for Boiler, Hot Water & Steam (C-4) across SoCal
None issued Oct 16 – Oct 22, 2026.
Quick facts
How many licensed boiler contractors are in Southern California?
208 boiler contractors with a California CSLB license list a business address in Southern California. 199 of them have an active license in good standing (CSLB data as of 10/22/2026).
How many boiler contractors in Southern California have a license problem right now?
9 are not in good standing right now, including 6 suspended for missing workers' comp. 20 active licenses expire within 90 days. Each county and city list linked here shows the status and a plain-English OK-to-hire verdict.
How do I check if a boiler contractor is licensed?
Search the business name or license number on LicenseWatch CA to see license status, bond and workers' comp in one place, then confirm on the CSLB website before you sign a contract. In California, work over $1,000 in labor and materials requires a licensed contractor.
New and lapsed SoCal licenses, every Monday
New licenses, expirations and workers' comp lapses across five counties. One short email a week.