GroundRosterSamantha T. GravelleLicensed
| Name | Samantha T. Gravelle |
| License number | 00390 |
| License type | Registered On-Site Wastewater (Septic) Professional |
| License status | Current — MD State Board of On-Site Wastewater Professionals |
| License expires | 2026-12-31 |
| Based in | Oakland, Maryland 21550 |
| Phone | (301) 334-6185 |
"Based in" is the city on the business's state license record. That can be a mailing address; it doesn't tell you where the business works.
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How to verify this license
We publish the license details exactly as they appear in Maryland's official licensing records; we do not vouch for the business itself. Before hiring, look up license #00390 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: MD State Board of On-Site Wastewater Professionals - registered individuals, last checked 2026-08-17. Verify at the official source.
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