Septic Systems
No city sewer? You need a septic permit in Gregg County
Homes in unincorporated Gregg County that are not on a city sewer must have a permitted septic system, called an on-site sewage facility (OSSF).
If your home is not hooked up to a city sewer, it needs a septic system. In Texas, these are called on-site sewage facilities, or OSSFs. You must get a permit before you install or significantly repair one. Skipping the permit is a violation.
The permit process includes a site visit, soil testing, and design approval. In most Texas counties, a local authority handles the permits — not TCEQ (the Texas Commission on Environmental Quality) directly. Check with Gregg County or your city to find out who handles permits in your area.
If you are buying rural land, ask whether the existing septic system has a permit and when it was last checked. A system in poor shape can be costly to fix. The TCEQ homeowners page explains what to look for and how the permit process works. Check the official source already cited before making any decisions.
Source to confirm: TCEQ — On-Site Sewage Facilities for Homeowners