Best Licensed Plumbers in Castro Valley, CA
21 plumbing companies registered in Castro Valley hold current CSLB licenses, verified against official records as of August 17, 2026. The 8 below are the top-ranked, ordered by workers' compensation cover and years licensed.
How we chose: We identified 21 companies registered in Castro Valley. 21 passed license verification. The 8 below are the top-ranked of those. Our methodology
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- ✓ CSLB License #406575 - look up this number at CSLBInsured - SECURITY NATIONAL INSURANCE COMPANYBonded - $25,000
- Verified
- August 17, 2026
- Licensed since
- 1981
- Phone
- (510) 604-1078
- ✓ CSLB License #672250 - look up this number at CSLBInsured - SERVICE AMERICAN INDEMNITY COMPANYBonded - $25,000
- Verified
- August 17, 2026
- Licensed since
- 1993
- Phone
- (510) 481-0380
- ✓ CSLB License #909971 - look up this number at CSLBInsured - STATE COMPENSATION INSURANCE FUNDBonded - $25,000
- Verified
- August 17, 2026
- Licensed since
- 2008
- Phone
- (510) 754-2630
- ✓ CSLB License #995431 - look up this number at CSLBInsured - AMTRUST INSURANCE COMPANYBonded - $25,000
- Verified
- August 17, 2026
- Licensed since
- 2014
- Phone
- (925) 575-7584
- ✓ CSLB License #1037436 - look up this number at CSLBInsured - BERKLEY CASUALTY COMPANYBonded - $25,000
- Verified
- August 17, 2026
- Licensed since
- 2018
- Phone
- (510) 825-4736
- ✓ CSLB License #251165 - look up this number at CSLBBonded - $25,000
- Verified
- August 17, 2026
- Licensed since
- 1967
- Phone
- (510) 582-0934
- ✓ CSLB License #422946 - look up this number at CSLBBonded - $25,000
- Verified
- August 17, 2026
- Licensed since
- 1982
- Phone
- (707) 567-5246
- ✓ CSLB License #561709 - look up this number at CSLBBonded - $25,000
- Verified
- August 17, 2026
- Licensed since
- 1989
- Phone
- (510) 520-9866
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Demiguel Plumbing | #406575 | On file | 1981 |
| Streamline Plumbing & Drain Co | #672250 | On file | 1993 |
| Just Plumbing Inc. | #909971 | On file | 2008 |
| Alligator Plumbing Inc. | #995431 | On file | 2014 |
| Gaxl General Construction Inc. | #1037436 | On file | 2018 |
| Frank Bonetti Plumbing Inc. | #251165 | Exempt or none on file | 1967 |