GroundRosterGraywater SepticLicensed
| Name | Graywater Septic |
| Company | Markwell, John T |
| License type | Certified Installer |
| License status | Active - MSDH certified |
| License expires | 06/30/2027 |
| Based in | Coldwater, Mississippi 38618 |
| Phone | (662) 622-7722 |
"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
- Installation / repair: licensed to build and install septic tanks and drainfields, and to repair or replace failed ones.
How to verify this license
We publish the license details exactly as they appear in Mississippi's official licensing records; we do not vouch for the business itself. Before hiring, look up this license directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: Mississippi Dept. of Health - Certified Onsite Wastewater Professionals, last checked 2026-08-17. Verify at the official source.
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