Septic system requirements in Lenawee County, Michigan
The septic rules landplan.io applies in Lenawee County, what a septic tank costs there, and the parcel data we hold.
Updated
Design a septic system for an address in Lenawee County
Michigan's state rules apply in Lenawee County: landplan.io has no county rules of its own here. State rules: Reviewed See Michigan's rules
Septic systems allowed in Lenawee County
The system types landplan.io permits in Lenawee County:
- Bed Distribution System
- Trench Distribution System
- Infiltrator Advanced Treatment Leachfield
- Infiltrator Advanced Enviro-Septic® (AES)
- Alternative System Wisconsin Mound
- Bed Distribution System with Pressure Laterals
- Alternative System Low Pressure Pipe
Septic tank size in Lenawee 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 Lenawee County
| From | To | Distance |
|---|---|---|
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
These are the values the landplan.io design engine applies in Lenawee County. Confirm a design with the Michigan health department or your county's before you build.
Parcel data in Lenawee County
landplan.io has parcel boundaries for Lenawee County (100% of its area): type an address and the design starts from the parcel.
Septic companies, designers and jobs in Michigan
- Septic companies and distributors in Michigan
- Septic designers in Michigan
- Septic design jobs in Michigan
Where the rules come from
The regulations and documents landplan.io's Lenawee County, Michigan rules are read from:
- Michigan Criteria for Subsurface Sewage Disposal (Michigan Criteria for Subsurface Sewage Disposal (statewide technical criteria; not a promulgated administrative rule))
- District Health Department #10 Sanitary Code (DHD#10 Sanitary Code, Chapter 5 Wastewater and Sewage Disposal (and Chapters 1-10))
- Oakland County Sanitary Code (January 2026 compilation): Article II Groundwater Protection and Article III Sewage Disposal and Treatment (Oakland County Sanitary Code, Articles I-III)
- Washtenaw County Engineering Guidelines for On-Site Sewage Disposal Systems (Washtenaw County Environmental Health Division, Engineering Guidelines (January 25, 2002), under the Washtenaw County...)
Near Lenawee County
- Hillsdale County
- Washtenaw County
- Monroe County
- Jackson County
- Wayne County
- Livingston County
- Ingham County
- Branch County
- All of Michigan
Questions
What septic systems are allowed in Lenawee County?
landplan.io designs by Michigan's state rules there and permits: Bed Distribution System, Trench Distribution System, Infiltrator Advanced Treatment Leachfield, Infiltrator Advanced Enviro-Septic® (AES), Alternative System Wisconsin Mound, Bed Distribution System with Pressure Laterals and Alternative System Low Pressure Pipe.
What size septic tank do I need in Lenawee County?
landplan.io sizes the septic tank in Lenawee 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 Lenawee County, Michigan?
Yes: parcel boundaries cover Lenawee County (100% of its area).