Onslow Construction
Septic systems

Septic, handled with the build.

When a lot has no municipal sewer, the septic system is part of the job. We handle engineered septic on our ground-up builds, and on its own, across Onslow, Pender, and Carteret counties.

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Soil-driven design
Every system
Conventional + advanced
What we install
3 – 4 weeks
Typical permit time
(910) 708-4790
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Excavator and site preparation underway on a rural lot in Onslow County, North Carolina
Six-step process

From soil report to certificate of occupancy.

01

Soil evaluation

An NC-authorized soil scientist evaluates your lot for perc rate, water table, and seasonal saturation. Their report drives every decision after it.

02

System design

Conventional, low-pressure pipe, drip, or advanced treatment, picked to fit what the soil will actually take. We bring options, not a one-system-fits-all bid.

03

Permit submission

We submit plans to the county environmental health office and walk the inspector through the lot. Most permits come back inside three to four weeks.

04

Install

Tank, distribution box, drain field, and any pumps installed to spec. We schedule around your foundation work so the slab doesn't sit waiting on the septic.

05

Inspection + cover

Final inspection from the county before cover. You get the operations permit; we hand off a system that's ready for the certificate of occupancy.

06

Service + warranty

Pump-out schedule, baffle checks, and drain field aeration if you want them. Most installs we do, we end up servicing five years later.

When you need us

Four common starting points.

New construction on a private lot

Any lot in Onslow, Pender, or Carteret without municipal sewer needs septic before a CO. We sequence around your build, not the other way around.

Failing or flooded system

Drain field saturated. Backup at the house. Standing water in the yard. We diagnose, repair if we can, or design a replacement that fits the soil report.

Buying a property with septic

Pre-purchase inspections and pump-outs so you know what you're buying before you close. Findings written up the same way a home inspector would.

Part of a ground-up build

On our own multi-family and custom builds, septic is one of the trades we manage. Sequenced with grading and foundation work so the schedule doesn't break.

Common questions

What private-lot owners ask first.

How long does a typical septic install take?

From soil eval through county inspection, plan on 6 to 10 weeks. Permit review is the biggest variable — most permits come back in 3 to 4 weeks. Install itself is usually a week.

What if my soil has high water table or tight clay?

That's what the soil evaluation is for. If conventional won't pass, we have options — low-pressure pipe, drip distribution, or advanced treatment. We bring options to the soil report, not the other way around.

Can I keep building while the septic is going in?

Yes, with sequencing. We coordinate with your framing crew so the slab pour, framing, and septic installation don't trip over each other. Final hookup happens before certificate of occupancy.

Do you service systems you didn't install?

Yes. Pump-outs, baffle checks, drain field aeration, and diagnostic visits for failing systems. We service systems across coastal North Carolina regardless of who put them in.

What does the county inspection cover?

The county environmental health office inspects the system before it's covered — tank, distribution box, drain field layout, pipe slopes. We walk the inspector through and document everything for your operations permit.

Let’s talk

Tell us what
you want to build.

No high-pressure sales. We’ll talk for 15 minutes, see if we’re the right contractor for the job, and if we are, get you a bid.