Septic Systems
Unincorporated Denton County homes without city sewer need a septic permit
Installing, repairing, or changing a septic system outside city limits in Denton County requires a permit from the county Environmental Health Division.
If your property is outside any city's limits in Denton County, it may not be connected to a public sewer. In that case, it likely uses a septic system. The official name is an on-site sewage facility, or OSSF. You must get a county permit before you install, fix, or change one.
Denton County Environmental Health is the office that handles these permits. Every new system must pass a final inspection before you can use it. Some systems also need a note added to your deed. That note tells future buyers the system is there. For current permit rules, visit the Environmental Health Division page on dentoncounty.gov or the TCEQ website.
Source to confirm: Denton County — Environmental Health Division