GroundRosterJohn C. RiffeLicensed
| Name | John C. Riffe |
| Company | Gradient Construction, LLC |
| License number | 00172 |
| License type | Registered On-Site Wastewater (Septic) Professional |
| License status | Current — MD State Board of On-Site Wastewater Professionals |
| License expires | 2028-06-30 |
| Location | Chesapeake Beach, Maryland 20732 |
| Phone | (410) 610-7669 |
Request a quote from John C. Riffe
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 #00172 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.
Are you John C. Riffe? Claim this listing to set your business name and add your website, service area, hours, and photos. It's free.