TCEQ Licensed · North Texas

Septic Design You Can Count On

24-hour turnaround on most designs. Precise, TCEQ-compliant work from licensed site evaluators serving eight counties across North Texas.

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Jim Adams Licensed Site Evaluator
SE License #OS0028299

Nathan Adams Licensed Site Evaluator & Registered Sanitarian
SE License #OS0036228 · RS License #5082

What sets us apart

Built on accuracy, speed, and communication

Up-to-Date Property Information

We use the most current data available on your property to ensure every design complies with all TCEQ and local permitting regulations — no surprises at the permit office.

Detailed, Thorough Designs

We go into as much detail as possible to iron out potential installation issues on paper — before any excavation begins and before problems become expensive.

24-Hour Turnaround

We deliver completed designs within 24 hours on almost all projects. When your project timeline is tight, you won't be waiting on us.

Our team

A family business with deep local roots

Founded in 2016, Collin County Septic is a father-son operation that together has designed over 10,000 systems across North Texas throughout the past decade. Jim and Nathan are both licensed site evaluators with TCEQ, and Nathan is also a Registered Sanitarian in the state of Texas — a combination of credentials and 30 years of combined field experience that go hand in hand to deliver a level of expertise unmatched in the industry. Before founding the business, Jim spent over a decade with Collin County Development Services, giving the team an insider understanding of county requirements that most designers simply don't have.

Jim Adams Licensed Site Evaluator SE License #OS0028299 BS in Earth Science

Nathan Adams Licensed Site Evaluator & Registered Sanitarian SE License #OS0036228 · RS License #5082 BA in Mathematics

What we design

All major system types

Whether your site calls for a conventional system or something more specialized, we have the experience to design it right.

Aerobic Spray Systems

Aerobic Drip Irrigation

Low Pressure Dosing (LPD)

Evapotranspirative (ET) Systems

Conventional Septic Systems

Project outside the standard types? Get in touch and we'll talk through your options.

Where we work

Eight counties across North Texas

We primarily serve the following counties. Other areas considered on a case-by-case basis — just ask.

Collin Dallas Fannin Grayson Hunt Kaufman Rains Rockwall

Located outside these counties? Contact us — we consider requests outside our primary area on a case-by-case basis.