Cost guide
What drainfield replacement costs in Georgia
A conventional drainfield replacement runs about $3,000 to $15,000, per HomeGuide's 2026 figures, with the national average near $7,000 per Angi and Bob Vila. Engineered and alternative systems price above that range. This guide lays out the published numbers, what actually moves them on a North Georgia lot, and how to buy the project so you pay for it once.
The published numbers, side by side
Every figure below comes from a national cost publisher or a county fee schedule, cited inline. None is a quote; all are planning ranges.
| Project | Published range | Source |
|---|---|---|
| Drainfield (leach field) replacement, conventional | $3,000 to $15,000 | HomeGuide, 2026 |
| Drainfield replacement alone, national average | about $7,000 | Angi, 2026; corroborated by Bob Vila |
| Septic tank plus drainfield replaced together | $5,000 to $12,000 | Angi, 2026 |
| New conventional septic system, installed | $3,500 to $8,500 | HomeGuide, 2026 |
| New septic system, full range of national projects | $3,591 to $12,463 (average $8,027) | Angi, 2026; This Old House publishes $3,480 to $11,625 |
| Forsyth County wastewater construction or repair permit | $170 | Forsyth County EH fee schedule |
Sources: HomeGuide drainfield cost, Angi drainfield cost, Bob Vila, HomeGuide system cost, Angi system cost, This Old House, and the Forsyth County fee schedule. Retrieved 2026.
What moves the number on a North Georgia lot
Four factors do most of the work. First and largest, the soil: field size is set by how fast the ground accepts water, and the Cecil-series clay across Cherokee, Forsyth, and Hall counties accepts it slowly, which pushes trench area up. This is why UGA Extension recommends sizing from measured saturated hydraulic conductivity rather than assumptions. Second, what the evaluation finds: a lot with a workable reserve area gets a conventional field at the published ranges, while a lot without one moves toward engineered and alternative systems priced above them. Third, scope: replacing the tank at the same time moves the project into Angi's $5,000 to $12,000 tank-plus-field band. Fourth, access: trees, slopes, and tight lots add machine time.
County paperwork is the small, predictable line item. Forsyth publishes $170 for the construction or repair permit; Cherokee (770-479-0444) and Hall (770-531-3973) set fees at the office. The permit sequence itself is in the North Georgia septic permits guide.
How to buy the project once
Run the order the county already enforces. Get the soil evaluation, then get quotes, in writing and itemized, from contractors quoting the same evaluated facts. Treat any number offered before the evaluation as a placeholder, ask each bidder for their current DPH certification, and compare quotes on scope rather than bottom line. The process side of the job, failure signs through final inspection, lives on the drainfield replacement page; if the project is a full first-time system, the new septic installation page covers that lane and its lot questions.
Frequently Asked Questions
How much does drainfield replacement cost in Georgia?
Plan around $3,000 to $15,000 for a conventional drainfield, the range HomeGuide publishes for 2026, with the national average near $7,000 per Angi and Bob Vila. Engineered and alternative systems for difficult soil price above that range, and the county soil evaluation is what determines which side of the line a Georgia lot is on.
Why do quotes vary so much for the same yard?
Because quotes made before the soil evaluation are guesses. Field size is set by measured soil absorption, and in Piedmont clay that measurement swings the trench area substantially. Access for equipment, system type, and whether the tank is replaced at the same time move the number further. A quote written after the county has read your soil is comparing like with like; one written before is not.
Does insurance or the county cover any of it?
Homeowners insurance generally treats drainfield wear-out as maintenance rather than a covered loss, though policies differ and reading yours costs nothing. On the county side, Forsyth publishes a $170 construction or repair permit fee and offers a $100 pump-out rebate as a maintenance nudge; Cherokee and Hall set permit fees at the office. No county in this corridor publishes a replacement subsidy.
Is it cheaper to keep pumping instead of replacing the field?
For a while, and then decisively not. Pumping buys time when a field is merely loaded; when the soil has stopped accepting water, ever-more-frequent pumpings become a subscription to a problem that is not improving. The honest comparison is a season of repeat pumpings against a permitted replacement that resets the clock for decades.
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