Septic system requirements in Twin Falls County, Idaho
The septic rules landplan.io applies in Twin Falls County, what a septic tank costs there, and the parcel data we hold.
Updated
Design a septic system for an address in Twin Falls County
Idaho's state rules apply in Twin Falls County: landplan.io has no county rules of its own here. State rules: Reviewed See Idaho's rules
Septic systems allowed in Twin Falls County
The system types landplan.io permits in Twin Falls County:
- 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 Twin Falls County
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 Twin Falls County
| From | To | Distance |
|---|---|---|
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
These are the values the landplan.io design engine applies in Twin Falls County. Confirm a design with the Idaho health department or your county's before you build.
Parcel data in Twin Falls County
landplan.io has parcel boundaries for Twin Falls County (100% of its area): type an address and the design starts from the parcel.
Septic companies, designers and jobs in Idaho
Where the rules come from
The regulations and documents landplan.io's Twin Falls County, Idaho rules are read from:
Near Twin Falls County
- Jerome County
- Gooding County
- Lincoln County
- Cassia County
- Minidoka County
- Camas County
- Owyhee County
- Elmore County
- All of Idaho
Questions
What septic systems are allowed in Twin Falls County?
landplan.io designs by Idaho's state rules there and permits: 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 Twin Falls County?
landplan.io sizes the septic tank in Twin Falls County 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 for Twin Falls County, Idaho?
Yes: parcel boundaries cover Twin Falls County (100% of its area).