Underground Utilities & Septic Systems

Utility and Septic Solutions You Can Count On

When you're developing land or preparing a build site, you need underground work done safely, efficiently, and to code. At Scoggins Site Development & Engineering, we specialize in underground utility installation, trenching, and septic system services throughout Paso Robles and the surrounding Central Coast region.


Whether you’re installing new water and sewer lines, tying into existing utilities, or laying out a septic system on rural land, we provide the experience and equipment to get the job done right — the first time.

A construction site with a lot of pipes in the dirt.

Our Underground & Septic Services

We serve both residential and commercial clients with full-scope underground utility solutions:


Utility Tie-Ins

We handle all aspects of connecting to local water, sewer, gas, and electrical services, ensuring clean access and code compliance.


Trenching & Excavation

Precision trenching for underground lines, conduit, and piping. We dig to spec and ensure proper backfilling and compaction.


Septic System Installation

We install complete septic tank systems, leach lines, and drainage fields, including soil testing coordination and permitting.


Sewer & Water Line Installations

New or replacement lines for homes, commercial buildings, and remote properties.



Drainage System Setup

French drains, culverts, and sub-surface drainage solutions to prevent water damage and soil erosion.


All installations are handled with safety, efficiency, and long-term durability in mind.

Why Hire a Licensed Underground Utilities Contractor?

We’re not just an excavation team — we’re a fully licensed underground utilities contractor serving Paso Robles and San Luis Obispo County. That means:


  • All work meets local/state utility regulations
  • We use the proper trenching depth and materials for each utility type
  • We coordinate inspections and compliance checks
  • We plan work to avoid costly re-digs or future interference

You get peace of mind knowing your utility and septic installs are done correctly — and ready to serve your property for decades.

A tractor is digging a hole in the ground to install a septic system.

Who We Serve

We provide underground services for:


  • Homeowners building custom homes or upgrading outdated systems
  • Developers handling multi-lot utility tie-ins
  • Contractors seeking a trusted trenching and septic partner
  • Commercial projects requiring heavy-duty drainage and utility installs

With a 150-mile service radius, we’re positioned to support clients throughout Paso Robles, Atascadero, Templeton, San Miguel, and beyond.

FAQs – Utilities & Septic Systems

  • Do I need permits for septic installation?

    Yes — and we can help guide the permitting process with the county and health department.

  • Can you handle rocky or sloped terrain?

    Absolutely. Our equipment and experience allow us to trench and install even in challenging soil conditions.

  • Do you replace old or damaged utility lines?

    Yes. We provide both new installation and replacement services for water, sewer, and drainage systems.

  • What septic systems do you install?

    We install conventional systems, chamber systems, and alternative solutions based on your site’s soil and size.

Connect With a Reliable Underground Utilities Contractor

Whether you’re building from scratch or upgrading an aging system, Scoggins Site Development & Engineering delivers safe, code-compliant underground work from start to finish.