Septic system requirements in South Dakota
What landplan.io applies when it designs a septic system in South Dakota: 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 Dakota
Reviewed landplan.io designs by South Dakota's own rules, which our staff reviewed against the state's regulations. Last published 5 October 2026.
Septic systems allowed in South Dakota
The system types landplan.io permits in South Dakota:
- 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 Dakota
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 Dakota
| From | To | Distance |
|---|---|---|
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
These are the values the landplan.io design engine applies in South Dakota. Confirm a design with the South Dakota health department or your county's before you build.
Parcel data in South Dakota
landplan.io has parcel boundaries for 56 of South Dakota's 66 counties, and part of 2 more: the counties where 80% of the state's people live. Type an address there and the design starts from the parcel.
Septic companies, designers and jobs in South Dakota
- Septic companies and distributors in South Dakota (7)
- Septic designers in South Dakota
- Septic design jobs in South Dakota
Where the rules come from
The regulations and documents landplan.io's South Dakota rules are read from:
Septic rules by county in South Dakota
- Aurora County
- Beadle County
- Bennett County
- Bon homme County
- Brookings County
- Brown County
- Brule County
- Buffalo County
- Butte County
- Campbell County
- Charles mix County
- Clark County
- Clay County
- Codington County
- Corson County
- Custer County
- Davison County
- Day County
- Deuel County
- Dewey County
- Douglas County
- Edmunds County
- Fall river County
- Faulk County
- Grant County
- Gregory County
- Haakon County
- Hamlin County
- Hand County
- Hanson County
- Harding County
- Hughes County
- Hutchinson County
- Hyde County
- Jackson County
- Jerauld County
- Jones County
- Kingsbury County
- Lake County
- Lawrence County
- Lincoln County
- Lyman County
- Marshall County
- Mccook County
- Mcpherson County
- Meade County
- Mellette County
- Miner County
- Minnehaha County
- Moody County
- Oglala lakota County
- Pennington County
- Perkins County
- Potter County
- Roberts County
- Sanborn County
- Spink County
- Stanley County
- Sully County
- Todd County
- Tripp County
- Turner County
- Union County
- Walworth County
- Yankton County
- Ziebach County
Questions
What septic systems are allowed in South Dakota?
landplan.io permits these system types in South Dakota: 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 Dakota?
landplan.io sizes the septic tank in South Dakota 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 Dakota?
Yes, for 56 of South Dakota's 66 counties, and part of 2 more.