Septic inspection when selling a house in Maine
1 statewide rule and 0 local rules from official sources.
General information, not legal advice. This is our summary of the official rule as we read it. The ordinance or code and the health department decide: confirm with them before you list, sign or close.
Statewide: septic system at sale
Only property in a shoreland area (38 M.R.S. ยง435). The seller must also say in writing whether the system malfunctioned in the 180 days before the sale.
| Question | What the official text says |
|---|---|
| What is required | Seller gives buyer a written statement on any malfunction in the prior 180 days; buyer has the system inspected by a department-certified inspector Source: legislature.maine.gov |
| Triggered by | transfer of property in a shoreland area Source: legislature.maine.gov |
| Deadline | inspection before purchase, or within 9 months after transfer if weather prevents; malfunction repaired within 1 year after transfer Source: legislature.maine.gov |
| Who arranges it | buyer (purchaser) orders the inspection; seller provides the 180-day malfunction statement Source: legislature.maine.gov |
| How long a report is valid | Seller's department-certified inspection report from within 3 years before transfer is acceptable Source: legislature.maine.gov |
| Exemptions |
Source: legislature.maine.gov |
| If the system fails | Malfunctioning system must be repaired or replaced within 1 year after transfer Source: legislature.maine.gov |
| Who may inspect | Maine CDC Subsurface Wastewater program (certified inspectors). official list (maine.gov) Source: maine.gov |
| In force since | January 1, 2020 Source: legislature.maine.gov |
Checked on November 9, 2026: read on the official site.
Private wells in Maine
About 660,497 of Maine’s 1,329,328 residents (50%) got their drinking water from a private well in 2015, by the USGS estimate.
Source: USGS county water use 2015 (Dieter et al., 2018); 16 counties in the USGS table.
Where private wells (and usually septic systems) are most common
Maine ranks 20 of 45 states and territories by people on private wells (USGS 2015). In 12 of its 16 counties more than half of residents drink from a private well; homes there usually also treat wastewater on site, so a septic check and a well test tend to come up together at sale. The highest shares:
- Waldo County: 76% of 39,155 residents on a private well
- Lincoln County: 68% of 33,969 residents on a private well
- Oxford County: 67% of 57,202 residents on a private well
- Hancock County: 66% of 54,659 residents on a private well
- Washington County: 64% of 31,625 residents on a private well
- Franklin County: 56% of 29,991 residents on a private well
- Somerset County: 55% of 51,113 residents on a private well
- Kennebec County: 55% of 119,980 residents on a private well
USGS county water use 2015 (Dieter et al., 2018). The USGS table counts well users, not septic systems; no national county count of septic systems exists.
Soils for septic drain fields in Maine
Across the 4 counties with USDA soil survey data, 95% of rated land is “very limited” for a conventional septic drain field. Most limited: Cumberland County (98%), York County (96%), Kennebec County (93%). Least limited: Waldo County (92%), Kennebec County (93%), York County (96%).
Source: USDA NRCS Soil Survey Geographic Database (SSURGO), via Soil Data Access, rating “ENG - Septic Tank Absorption Fields”, read November 15, 2026. County-wide ratings, not a test of one lot.
How the neighbouring states compare
Maine has a statewide rule. Of its 1 neighbouring states, 1 has a statewide rule at sale; a buyer moving across the line may meet a different rule. From our register of official rules:
- New Hampshire: statewide septic system rule at sale.
Testing a well? See certified well-water labs and testing advice in Maine.
Other states: all states.