GroundRosterMark Downing
| Name | Mark Downing |
| Company | Donald L Hamlin Consulting Engineers Inc |
| License number | 502 |
| License type | Class Expiration Date: Designer |
| License status | Active |
| License expires | 12/31/2016: the expiry date in our copy (as of 2026-08-16) has passed. Check the state. |
| Based in | Essex Junction, Vermont 05452 |
| County on the state list | Chittenden |
| Phone | (802) 878-3956 |
"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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What this license covers
- Design: licensed to size and lay out a septic system for a specific site and soil condition.
How to verify this license
We publish the license details exactly as they appear in Vermont's official licensing records; we do not vouch for the business itself. Before hiring, look up license #502 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: VT DEC - Licensed Wastewater Designers & Site Technicians, last checked 2026-08-16. Verify at the official source.
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