| Company | Location | Certifications | License # |
|---|---|---|---|
| Advanced Utilities And Septic Inc. | Callahan, FL | Installer (Business Authorization) | SA0091670 |
| Crazy Ted'S Home Improvement & Mobile Home Repair Inc. | Callahan, FL | Installer (Business Authorization) | SA0091599 |
| Daniel R. Hendricks Septic Services | Callahan, FL | Installer (Exempt Business) | SE0000990 |
| James N. Seagraves | Fernandina Beach, FL | Installer (Exempt Business) | SE0091605 |
| K. A. Farmer Septic Tank Service Llc | Callahan, FL | Installer (Business Authorization) | SA0930686 |
| Murrays Septic Service Llc | Yulee, FL | Installer (Business Authorization) | SA0222151 |
| Ronald Senechal Septic Llc | Callahan, FL | Installer (Business Authorization) | SA0192046 |
| Thomas Septic Inspections Llc | Bryceville, FL | Installer (Business Authorization) | SA0181979 |
8 companies in the Florida DEP septic tank contractor registrations & business authorizations are based in Nassau County as of 2026-07-23. Companies based elsewhere in Florida also commonly serve the county.
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