Official sources checked August 29, 2026

Denton County, Texas septic permits and requirements

Authority and service area

Denton County Public Health administers the county OSSF order throughout the unincorporated portions of Denton County. Environmental Health reviews OSSF designs, issues permits to construct, performs final inspections, and enforces applicable onsite-sewage rules.

Development and septic permitting

For development in unincorporated Denton County, a septic permit may be required in addition to the county development permit. The development application requires a site plan showing proposed and existing improvements and existing septic systems.

Site and soil evaluation

The county septic guidance requires a site evaluation including a site plan and soil textural classification. The evaluation is provided by a private licensed professional engineer or a licensed site evaluator who holds the required sanitarian credential.

Design, maintenance documents, and affidavits

The OSSF application package can require the system design, a valid maintenance contract when applicable, and applicable affidavits filed with the County Clerk. Applicants should use the county septic permit packet for the current submittal requirements.

Final inspection before cover

Every OSSF permit requires a final inspection by Denton County Environmental Health. County guidance tells installers not to backfill around tanks before inspection and to contact the office at least two days before the requested final inspection.

Repairs and existing systems

Environmental Health investigates complaints involving existing OSSFs. Property owners planning construction around an existing septic system should coordinate the development and OSSF reviews before work begins so the system and disposal area remain protected.

Official sources

• Denton County — Environmental Health Division
• Denton County — Development Services
• Denton County — Applying for Development Permits
• Denton County — What You Must Know

SepticScope summarizes public-agency information for planning purposes. The permitting agency's current instructions control if they differ from this guide.