Cumberland County · Pop. 68,408
Portland is Maine's largest city and the economic hub of the southern Maine coast, perched on a peninsula jutting into Casco Bay. While Portland proper and its immediate suburbs of South Portland and Westbrook are served by municipal sewer, the broader Cumberland County region — including fast-growing communities like Gorham, Windham, Standish, Naples, and Raymond — relies almost entirely on private septic systems. Cumberland County has an estimated 55,000 to 65,000 on-site wastewater systems, many of them aging cesspools and early-generation systems installed before Maine adopted its current septic code in 1974. The county's challenging combination of shallow bedrock, glacial till with poor drainage, deep frost penetration, and intensive spring snowmelt makes it one of the most demanding septic environments in New England. Many lakefront communities around Sebago Lake and its watershed are in the process of mandatory septic upgrades to protect the lake, which serves as Portland's drinking water supply.
Nest and Sons Inc.: Southern Maine Full Service Septic Company provides professional septic services in Portland, ME and surrounding areas. Contact them for a free estimate on pumping, repair, and inspection services.
Portland, ME
QuickDrain provides professional septic services in Portland, ME and surrounding areas. Contact them for a free estimate on pumping, repair, and inspection services.
Bangor, ME
G & P Septic Services LLC provides professional septic services in Bangor, ME and surrounding areas.
$2,000 – $15,000
$200 – $800
$300 – $600
$3,500 – $20,000
$275 – $600
$500 – $5,000
$6,000 – $25,000
$300 – $3,000
$50 – $500
$500 – $8,000
| Service | Average Cost |
|---|---|
| Septic Tank Pumping | $400 - $600 |
| Septic System Installation | $8,000 - $22,000 |
Cumberland County soils are products of glacial deposition — Buxton-Scantic silt loam and Swanton-Eldridge series are dominant, featuring glacial till with high stone content, silt loam to silty clay loam textures, and slow to very slow percolation (0.02 to 0.2 inches per hour). Shallow bedrock, often ledge granite within 18 to 36 inches, is a pervasive constraint. Glaciofluvial outwash deposits near river valleys have sandier, faster-draining soils but remain stony throughout.
The defining septic challenge in the Portland area is the glacial till soil profile: a thin layer of stony loam overlying dense, slowly permeable basal till that was compacted by the weight of glaciers. Below that, granite or metamorphic bedrock is often found within 2-4 feet of the surface throughout much of Cumberland County. This shallow effective soil depth — the vertical distance between the bottom of a drain field and either the water table or bedrock — is frequently the binding constraint. Maine DEP requires at minimum 24 inches of naturally occurring unsaturated soil below a conventional system, which is simply not available on many lots. Mound systems, which create an elevated fill bed above the natural soil surface, are extremely common in Cumberland County as a result. The stony till also makes excavation significantly more expensive than in southern states — ledge blasting can add $3,000-$8,000 to a septic installation when bedrock is shallow.
Maine's Subsurface Wastewater Disposal Rules (CMR 241) govern all on-site systems statewide, administered by DEP. Cumberland County enforcement occurs through the local plumbing inspector system — every Maine municipality has a Local Plumbing Inspector (LPI) who issues local permits in coordination with DEP. Maine has one of the strictest shoreland zoning regimes in the nation: in Shoreland Zone areas (within 250 feet of water bodies and wetlands), new septic systems must meet enhanced design requirements and setbacks. The Sebago Lake Watershed Protection Program specifically mandates that all failed or substandard systems within the Sebago Lake watershed be upgraded, and Portland Water District actively works with municipalities to enforce this. Engineered systems (mounds, drip irrigation, pressure dosing) are increasingly required as simpler system options are exhausted on challenging lots.
Cumberland County septic permits are issued by the Maine Department of Environmental Protection (DEP) Subsurface Wastewater program. All new systems and repairs require a site evaluation by a Licensed Site Evaluator (LSE) and a design by a Licensed Plumber or PE. Permits require a minimum of one passing perc test plus soil profile description. DEP fees range from $100 to $250 for the permit itself, but LSE evaluations cost $500-$1,200 and engineered designs add $800-$2,000. Portland and South Portland have local plumbing inspectors who issue local permits in parallel with state DEP. Maine's Shoreland Zoning law imposes 75-250 foot setbacks from water bodies, dramatically limiting system placement on lakefront and coastal properties.
Septic contractors in the surrounding region