GroundRosterKoenig DrillingLicensed
License details
| License number | 1038648 |
| License type | Well Drilling Contractor (C-57) |
| License status | Active, CSLB license CLEAR |
| License expires | April 30, 2028 |
| Based in | Cotati, Sonoma County, California 94931 |
"Based in" is the city and county of the address on the business's license record.
What this license covers
- Drilling / construction: licensed to bore, case, complete, and plug water wells.
How to verify this license
We publish the license details exactly as they appear in the public licensing records of the agency that issued the license; we do not vouch for the business itself. Before hiring, look up license #1038648 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.
Source: California Contractors State License Board (CSLB), last checked 2026-08-17. Look it up at the issuing agency.
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