Septic Systems
Rural Homes Need a Septic Permit Before You Build
Most rural properties in Franklin County are not on public sewer, so a permitted septic system is required by state law.
Any home not connected to a city sewer line needs an on-site sewage facility, or OSSF — the legal term for a septic system. In Texas, you must get a permit before you install, repair, or expand one. The Texas Commission on Environmental Quality (TCEQ) sets the rules.
In many rural counties, the local authority — often the county itself — handles OSSF permits instead of TCEQ directly. Contact Franklin County to find out who issues permits locally. You must hire a licensed site evaluator to test the soil. Putting in a system without a permit can result in fines. TCEQ's website has a full guide for homeowners.
Source to confirm: TCEQ — On-Site Sewage Facilities (Septic Systems) for Homeowners