Septic system requirements in Maine
What landplan.io applies when it designs a septic system in Maine: 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 Maine
Reviewed landplan.io designs by Maine's own rules, which our staff reviewed against the state's regulations. Last published 5 October 2026.
Septic systems allowed in Maine
The system types landplan.io permits in Maine:
- Conventional Trench System
- Drip Dispersal System
- Low Pressure Distribution
- Surface Discharging System
Septic tank size in Maine
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 Maine
| From | To | Distance |
|---|---|---|
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
These are the values the landplan.io design engine applies in Maine. Confirm a design with the Maine health department or your county's before you build.
Septic companies, designers and jobs in Maine
Where the rules come from
The regulations and documents landplan.io's Maine rules are read from:
Septic rules by county in Maine
- Androscoggin County
- Aroostook County
- Cumberland County
- Franklin County
- Hancock County
- Kennebec County
- Knox County
- Lincoln County
- Oxford County
- Penobscot County
- Piscataquis County
- Sagadahoc County
- Somerset County
- Waldo County
- Washington County
- York County
Questions
What septic systems are allowed in Maine?
landplan.io permits these system types in Maine: Conventional Trench System, Drip Dispersal System, Low Pressure Distribution and Surface Discharging System.
What size septic tank do I need in Maine?
landplan.io sizes the septic tank in Maine 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.