Best Licensed Septic Contractors in Grass Valley, CA
3 septic companies registered in Grass Valley hold current CSLB licenses, verified against official records as of August 17, 2026. All 3 are listed below, ordered by workers' compensation cover and years licensed.
- 6 active C-42 sanitation system licenses in Nevada County; 3 registered in Grass Valley
- 1 of Grass Valley's 3 licenses (33.3%) carries current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Grass Valley: 22 years
- Longest Grass Valley licensure: since 1996
- 0 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1996
- Phone
- (530) 273-2964
- Verified
- August 17, 2026
- Licensed since
- 2004
- Phone
- (530) 575-7765
- Verified
- August 17, 2026
- Licensed since
- 2011
- Phone
- (530) 273-7538
Compare the top 3 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Navo & Sons Inc. | #717036 | On file | 1996 |
| Black Diamond Builders | #831668 | Exempt or none on file | 2004 |
| Quick Response Septic & Portable Toilet Rentals | #960628 | Exempt or none on file | 2011 |
Nevada County septic licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 6 active C-42 sanitation system licenses in Nevada County, 3 of them registered in Grass Valley. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Grass Valley license has been held 22 years, and the longest-standing one dates to 1996. 1 of Grass Valley's 3 licenses (33.3%) carries 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: 6 of the county's 6 licenses carry the same $25,000 bond California sets by statute. 0 county licenses reach their 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 Grass Valley: common questions
How many licensed septic contractors are there in Grass Valley?
3 active C-42 sanitation system licenses are registered in Grass Valley, out of 6 across Nevada County. 3 Grass Valley-registered companies passed our license verification, and all 3 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. 3 active C-42 sanitation system licenses are registered in Grass Valley and 6 across Nevada County, the longest-standing issued in 1996. 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 1 of Grass Valley's 3 currently carry. 0 Nevada County licenses expire within 90 days.
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