Septic system requirements in Johnson County, Illinois
The septic rules landplan.io applies in Johnson County, what a septic tank costs there, and the parcel data we hold.
Updated
Design a septic system for an address in Johnson County
Illinois's state rules apply in Johnson County: landplan.io has no county rules of its own here. State rules: Reviewed See Illinois's rules
Septic systems allowed in Johnson County
The system types landplan.io permits in Johnson County:
- Subsurface seepage bed
- Subsurface seepage field
- Drip Irrigation System
- Low Pressure Distribution
- Infiltrator Advanced Treatment Leachfield (ATL)
- Infiltrator Advanced Enviro-Septic® (AES)
- Surface Discharging System
Septic tank size in Johnson 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 Johnson County
| From | To | Distance |
|---|---|---|
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
These are the values the landplan.io design engine applies in Johnson County. Confirm a design with the Illinois health department or your county's before you build.
Parcel data in Johnson County
landplan.io has no parcel boundaries for Johnson County yet: you draw the lot on the aerial map, and soil and elevation load as anywhere else.
Septic companies, designers and jobs in Illinois
- Septic companies and distributors in Illinois
- Septic designers in Illinois
- Septic design jobs in Illinois
Where the rules come from
The regulations and documents landplan.io's Johnson County, Illinois rules are read from:
- Private Sewage Disposal Code (77 Ill. Admin. Code Part 905)
- Illinois Water Well Construction Code: Section 920.180 Closed Loop Wells and Table C Minimal Lateral Distances (77 Ill. Adm. Code 920.180; 77 Ill. Adm. Code 920.Table C)
- Part 905 Private Sewage Disposal Code, Appendix A: Illustrations and Exhibits (Illustrations A, C-X) (77 Ill. Adm. Code 905.Appendix A, Illustrations A-X)
- Section 905.Illustration D - Location of Components of Private Sewage Disposal Systems (minimum distances) (77 Ill. Adm. Code 905.Appendix A, Illustration D)
Near Johnson County
- Pope County
- Williamson County
- Massac County
- Union County
- Pulaski County
- Saline County
- Alexander County
- Hardin County
- All of Illinois
Questions
What septic systems are allowed in Johnson County?
landplan.io designs by Illinois's state rules there and permits: Subsurface seepage bed, Subsurface seepage field, Drip Irrigation System, Low Pressure Distribution, Infiltrator Advanced Treatment Leachfield (ATL), Infiltrator Advanced Enviro-Septic® (AES) and Surface Discharging System.
What size septic tank do I need in Johnson County?
landplan.io sizes the septic tank in Johnson 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 Johnson County, Illinois?
Not yet: you draw the lot on the aerial map, and soil and elevation load as anywhere else.