Septic system requirements in South Carolina
What landplan.io applies when it designs a septic system in South Carolina: the system types allowed, tank sizes, setbacks and soil loading rates, with what septic products cost there.
Updated
Design a septic system for an address in South Carolina
Reviewed landplan.io designs by South Carolina's own rules, which our staff reviewed against the state's regulations. Last published 5 October 2026.
Septic systems allowed in South Carolina
The system types landplan.io permits in South Carolina:
- Elevated Sand Mound System
- Subsurface Pressure Trench System
- Subsurface Trench System
- Infiltrator Advanced Treatment Leachfield
- Infiltrator Advanced Enviro-Septic® (AES)
- Discharging System
Septic tank size in South Carolina
The daily design flow of a home: 150 gal/day per bedroom, at least 240 gal/day. The septic tank is sized from that flow:
| Daily design flow | Minimum tank |
|---|---|
| up to 240 gal/day | 1,000 gallons |
| 240 to 360 gal/day | 1,500 gallons |
| 360 to 600 gal/day | 2,000 gallons |
| 600 to 720 gal/day | 2,500 gallons |
| 720 to 840 gal/day | 2,750 gallons |
| 840 to 920 gal/day | 3,000 gallons |
| 920 to 1,040 gal/day | 3,250 gallons |
Septic setbacks in South Carolina
| From | To | Distance |
|---|---|---|
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
These are the values the landplan.io design engine applies in South Carolina. Confirm a design with the South Carolina health department or your county's before you build.
Parcel data in South Carolina
landplan.io has parcel boundaries for 45 of South Carolina's 46 counties: the counties where 99.6% of the state's people live. Type an address there and the design starts from the parcel.
Septic companies, designers and jobs in South Carolina
- Septic companies and distributors in South Carolina (17)
- Septic designers in South Carolina
- Septic design jobs in South Carolina
Where the rules come from
The regulations and documents landplan.io's South Carolina rules are read from:
Septic rules by county in South Carolina
- Abbeville County
- Aiken County
- Allendale County
- Anderson County
- Bamberg County
- Barnwell County
- Beaufort County
- Berkeley County
- Calhoun County
- Charleston County
- Cherokee County
- Chester County
- Chesterfield County
- Clarendon County
- Colleton County
- Darlington County
- Dillon County
- Dorchester County
- Edgefield County
- Fairfield County
- Florence County
- Georgetown County
- Greenville County
- Greenwood County
- Hampton County
- Horry County
- Jasper County
- Kershaw County
- Lancaster County
- Laurens County
- Lee County
- Lexington County
- Marion County
- Marlboro County
- Mccormick County
- Newberry County
- Oconee County
- Orangeburg County
- Pickens County
- Richland County
- Saluda County
- Spartanburg County
- Sumter County
- Union County
- Williamsburg County
- York County
Questions
What septic systems are allowed in South Carolina?
landplan.io permits these system types in South Carolina: Elevated Sand Mound System, Subsurface Pressure Trench System, Subsurface Trench System, Infiltrator Advanced Treatment Leachfield, Infiltrator Advanced Enviro-Septic® (AES) and Discharging System.
What size septic tank do I need in South Carolina?
landplan.io sizes the septic tank in South Carolina from the daily design flow: up to 240 gal/day: 1,000 gallons; 240 to 360 gal/day: 1,500 gallons; 360 to 600 gal/day: 2,000 gallons; larger flows need larger tanks. A home's design flow is 150 gal/day per bedroom, at least 240 gal/day.
Does landplan.io have parcel data in South Carolina?
Yes, for 45 of South Carolina's 46 counties.