Best Licensed Septic Contractors in Los Osos, CA
4 septic companies registered in Los Osos hold current CSLB licenses, verified against official records as of August 17, 2026. All 4 are listed below, ordered by workers' compensation cover and years licensed.
- 12 active C-42 sanitation system licenses in San Luis Obispo County; 4 registered in Los Osos
- 2 of Los Osos's 4 licenses (50.0%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Los Osos: 20 years
- Longest Los Osos licensure: since 1977
- 1 county license reaches its expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 2005
- Phone
- (805) 528-5641
- Verified
- August 17, 2026
- Licensed since
- 2006
- Phone
- (805) 528-0432
- Verified
- August 17, 2026
- Licensed since
- 1977
- Phone
- (805) 528-4900
- Verified
- August 17, 2026
- Licensed since
- 1990
- Phone
- (805) 235-3300
Compare the top 4 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Story's Construction | #870176 | On file | 2005 |
| Al's Septic Pumping Service Inc. | #883281 | On file | 2006 |
| Frank Merill Backhoe Services | #337347 | Exempt or none on file | 1977 |
| Tutt Tree Crane And Service | #606137 | Exempt or none on file | 1990 |
San Luis Obispo County septic licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 12 active C-42 sanitation system licenses in San Luis Obispo County, 4 of them registered in Los Osos. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Los Osos license has been held 20 years, and the longest-standing one dates to 1977. 2 of Los Osos's 4 licenses (50.0%) carry current workers' compensation cover in CSLB's file. That is employee injury cover, not liability insurance, and a blank usually means an owner-operator with no employees - lawful, and not a mark against anyone. The contractor bond is not a signal here: 12 of the county's 12 licenses carry the same $25,000 bond California sets by statute. 1 county license reaches its expiration date within the next 90 days. CSLB cannot link straight to a license record, so every listing above shows its number for you to type into CSLB's license lookup. How we verify.
Septic Contractors in Los Osos: common questions
How many licensed septic contractors are there in Los Osos?
4 active C-42 sanitation system licenses are registered in Los Osos, out of 12 across San Luis Obispo County. 4 Los Osos-registered companies passed our license verification, and all 4 are listed on this page. Only licenses CSLB shows as CLEAR and unexpired are listed.
Does California license septic contractors?
Yes. California licenses contractors by classification, and C-42 is the CSLB classification that authorises this work. 4 active C-42 sanitation system licenses are registered in Los Osos and 12 across San Luis Obispo County, the longest-standing issued in 1977. Only CLEAR, unexpired licenses appear here.
How do I check a septic contractor's license in California?
Every listing above shows its CSLB license number. CSLB cannot link straight to a record, so open its license lookup and type the number in: it shows status, expiration, the contractor bond and workers' compensation cover, which 2 of Los Osos's 4 currently carry. 1 San Luis Obispo County license expires within 90 days.
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