How Much Does a New Septic System Cost in Metro Atlanta Counties?

Cost is the first question, and the honest answer is a range: $8,000 on the low end, up to $20,000 if your lot needs an engineered system. Soil and system type do most of the work in setting that number, not tank size. If your soil already failed a perc test, that changes the math too, and your options after a failed perc test in metro Atlanta covers what usually happens next. Our septic installation in Atlanta GA team walks you through your real number before you sign anything.

What is the average cost to install a brand new septic system in metro Atlanta?

Most metro Atlanta installs land between $8,000 and $20,000, and the gap between those numbers comes down to two things: soil and system type.

A straightforward conventional system on decent soil lands closer to $8,000. We quoted a job like that in south Fulton County a few weeks ago: flat lot, sandy loam, no drainfield issues. An engineered mound or aerobic system on red clay pushes toward $18,000 to $20,000 because the county requires extra fill dirt and a pump.

Most metro Atlanta homes need a 1,000 to 1,500 gallon tank depending on bedroom count. Our septic installation in Atlanta GA team prices the tank, the drainfield, and labor separately so you see where the money goes.

If the drainfield is the only piece you need replaced, that alone runs $5,000 to $12,000. See the full breakdown in drainfield installation cost across metro Atlanta.

Do permit fees add a lot to the total cost of septic installation in metro Atlanta?

Permit fees are real, but they only add a few hundred dollars to the total. They are a small piece of the $8,000 to $20,000 range, not a major factor.

The Georgia Department of Public Health requires a county-issued permit before any new septic system goes in the ground, through its on-site sewage management program. Each metro county runs its own health department office, and fees vary county to county.

Processing usually takes 10 to 30 business days depending on the county, and Fulton and Cobb tend to move faster. We break down county-by-county fees in septic system permits across metro Atlanta, and in Fulton County specifically, how to get a septic permit in Fulton County walks through that office step by step.

Skipping the permit is not an option. A system installed without one can trigger a county order to stop using it until it is corrected, which costs far more than the fee ever would.

What type of septic system is the most affordable for a metro Atlanta home?

A conventional gravity system is the cheapest option we install, and it works on roughly half the lots we see across metro Atlanta.

Once soil can’t handle a standard gravity system, cost jumps. A pump system with a lift station adds a few thousand dollars. A mound system, common on tight or clay-heavy lots in Cobb and Gwinnett County, costs more because it needs engineered fill trucked in and shaped above grade. An aerobic treatment unit costs the most, used only when nothing else passes county approval.

In 13 years installing systems across metro Atlanta, we have found homeowners often assume they need the expensive option when they don’t. A soil test tells us for certain. Our soil testing and septic permits service usually runs before we quote a system type, so your price reflects your actual dirt.

If your old system is failing rather than gone, replacement isn’t always the answer. Sometimes a septic tank repair cost across metro Atlanta fix solves it for a fraction of a new install. Regular septic tank pumping in Atlanta GA can delay that $8,000 to $20,000 replacement for years, and a full drainfield repair in Atlanta GA can sometimes save the project entirely.

Does the soil type on my property affect installation cost?

Yes, and soil type moves the price more than anything else on this list, more than tank size or even lot size.

Gwinnett and Forsyth County have the most red clay in the metro. Red clay drains poorly, so a plain gravity system often fails the county soil test. When that happens, we move to an engineered mound or pump system, which adds $5,000 or more. We installed an engineered system on a red-clay lot off a side road in Cumming last spring, near the 30040 zip code, for about $17,000 total.

DeKalb and Fulton counties mix clay with better-draining soil, so pricing swings more by lot. Rockdale and Fayette County lots run larger and more rural, which can mean a bigger drainfield even on decent soil.

A percolation test is the only way to know for certain. That test has its own cost, broken down in perc test cost across metro Atlanta. If your soil already failed one, your options after a failed perc test in metro Atlanta covers what it adds to the budget.

How long does septic system installation take from permit to final inspection?

Budget 2 to 6 weeks from permit approval to your final county inspection. Permit approval itself typically takes 10 to 30 business days before that clock even starts.

The physical work, digging, tank placement, drainfield trenches, backfill, usually takes 3 to 7 days once crews are on site. Weather is the biggest variable. A wet spring in Cobb or Gwinnett County can push a job back a week if the ground is too saturated to dig safely.

After installation, the county sends an inspector to sign off before you can use the system. We schedule that visit as soon as backfill is done. Our drainfield installation in Atlanta GA crews coordinate the inspection directly with the county on most jobs.

Can I finance a new septic system installation in metro Atlanta?

Financing is common for a project this size, and most homeowners do not pay $8,000 to $20,000 in cash.

We work with homeowners on payment plans, and many lenders will roll a septic replacement into a home equity line or a renovation loan, especially when a failed system is holding up a home sale. If your system failed inspection, the repair or replacement often has to happen before closing, and we can usually move fast enough to keep the deal on schedule. See what that looks like in what happens when a septic system fails inspection during a home sale.

Call us before you commit to a lender. We can give you a firm number first, which makes financing conversations easier than walking in with a rough estimate. Families across Fulton County already trust us for this, including the best septic company in Sandy Springs, GA.

When should I call about a new septic system installation right away?

Some situations need a call today.

Call today if:

• Your county health department has already issued a notice about your failing system
• Sewage is surfacing in your yard with no working system to replace it, see drainfield failure signs across metro Atlanta or a simple drainfield repair across metro Atlanta
• A real estate closing is on hold waiting for a new septic system, see what happens when a septic system fails inspection during a home sale
• You are not sure if your old system can be saved and want a septic inspection in Atlanta GA first

Can wait a day or two:

• You are just gathering quotes before a home purchase
• You want a soil test scheduled before deciding on system type, see perc test cost across metro Atlanta
• You are comparing financing options before signing a contract

Frequently asked questions about septic system installation cost in metro Atlanta

Is a 1,000 gallon tank enough for a metro Atlanta home?

Most three-bedroom homes in metro Atlanta use a 1,000 to 1,250 gallon tank. Larger homes or households with a garbage disposal often need 1,500 gallons. Tank size is one part of the $8,000 to $20,000 total. Our septic installation in Atlanta GA team confirms the right size before quoting.

Is a mound system more expensive than a conventional system?

Yes, usually by several thousand dollars. A mound system needs engineered fill trucked in and shaped above grade, plus a pump that a standard gravity system does not need. We see mounds most often in Cobb and Gwinnett County. See engineered septic system design in Atlanta for the breakdown.

Can a repair fix a failed inspection instead of a full new system?

Sometimes. A failed inspection can mean one failed component, not the whole system. We check the tank, the baffles, and the drainfield separately before recommending replacement. See septic tank repair cost across metro Atlanta for what a repair alone usually runs.

Why does engineered design cost more on some metro Atlanta lots?

Clay-heavy lots in Forsyth and Gwinnett County usually need more design work than sandy lots in Fayette or Clayton County, since the soil forces a mound or pump system instead of standard gravity. Design work adds a few hundred to a couple thousand dollars, and our soil testing and septic permits service usually starts the process.

Should I expect drainfield installation to be the biggest part of my total cost?

Often, yes. The drainfield alone typically runs $5,000 to $12,000, close to half of a full project. Clay soil raises that number because it needs engineered fill instead of a standard gravel trench. See the full breakdown in drainfield installation cost across metro Atlanta.

When can a homeowner in Georgia install their own septic system?

Almost never for a conventional install. The Georgia Department of Public Health requires a licensed contractor and a county-issued permit before any system goes in the ground. A DIY install typically fails the county’s final inspection and forces a costly redo. Call septic installation in Atlanta GA for a licensed team that handles the permit for you.

Which metro Atlanta counties do we cover for new septic system installation?

We install new septic systems across all nine metro Atlanta counties. In Gwinnett County we get called out to Lawrenceville, Snellville, and Lilburn most often for clay soil issues, see septic services cost in Gwinnett County. In Cobb County we cover Marietta, Kennesaw, and Smyrna, including the 30066 and 30060 zip codes, detailed in septic services cost in Cobb County. Fulton County jobs run from Sandy Springs to Fairburn, see septic services cost in Fulton County. We’re also seeing more new builds near Cumming and south Forsyth County. Call 404-694-3060 and we can usually schedule a site visit within the week.