GroundRosterJonathan O. GuindonLicensed
| Name | Jonathan O. Guindon |
| Company | Sperry Drilling Services |
| License number | MSD250 |
| License type | MASTER WELL DRILLER - WATER SUPPLY |
| License status | Active — Maryland Board of Well Drillers licensee |
| License expires | 2027-06-01 |
| State | Maryland |
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What this license covers
- Drilling / construction: licensed to bore, case, complete, and plug water wells.
How to verify this license
We publish this listing exactly as it appears in Maryland's official licensing records; we do not vouch for the business itself. Before hiring, look up license #MSD250 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: Maryland State Board of Well Drillers - active licensees, last checked 2026-08-17. Verify at the official source.
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