Updated October 2026. Price ranges verified as of 2026-10-29 against the sources linked in each table.
In 2026, a new septic system in Ontario typically costs between $15,000 and $67,500, depending on the system type and the site. A conventional system on good soil sits at the low end, roughly $15,000 to $50,500 across the published 2026 ranges below. Raised beds and advanced (tertiary) treatment systems cost more, roughly $20,000 to $67,500. In Kingston and the surrounding townships, the permit comes from your city, town or township building department, and the soil evaluation on your lot decides which system you need.
This guide pulls together the 2026 price ranges published by Ontario sources, shows where they disagree, and explains what moves your number up or down. M. Riddle Excavating is a family-run excavation and septic contractor based in Kingston, and we install septic systems across Kingston, Greater Napanee, Frontenac County, Bath and Loyalist, Gananoque, Rideau Lakes and Prince Edward County. The ranges below are published market figures, not our prices. Your own number comes from a site visit and a quote.
Septic system cost by type in Ontario (2026)
Each range below is quoted from the source named in the same cell. Where sources disagree, every range is shown, so you can see the spread.
| System type | Published 2026 range (source) | When it is used |
|---|---|---|
| Conventional in-ground system (septic tank and leaching bed) | $15,000 to $30,000 for a 3 to 4 bedroom house (Ontario Rural Wastewater Centre) $15,000 to $35,000 (RenoQuotes, Ontario) $25,000 to $40,000 (BuildersOntario) $28,700 to $50,500 including design and permit (Premier Tech) | Soil that drains well, enough room for the bed, and a water table and bedrock deep enough below the surface |
| Raised bed or filter bed | $20,000 to $40,000 for a fully raised gravity system, 3 to 4 bedrooms (Ontario Rural Wastewater Centre) $30,000 to $50,000 for a raised, pressure or filter bed (BuildersOntario) | Heavy clay or silt, shallow bedrock, or a high water table, so the bed is built up with imported sand and stone |
| Advanced or tertiary treatment system | $25,000 to $50,000 for a typical 3 bedroom home, plus a maintenance contract (Ontario Rural Wastewater Centre) $32,700 to $67,500 including design and permit (Premier Tech) $35,000 to $65,000 or more (BuildersOntario; RenoQuotes, Ontario) | Small lots, poor soil, or a site near a lake or well that needs a higher level of treatment |
| Holding tank (Class 5) | From about $8,000 for a 6,000 litre concrete tank on a flat, easy-access site (Premier Tech), plus frequent pump-outs | Sites where no treatment system will fit. A holding tank stores all wastewater and provides no treatment, so it needs regular pumping by a licensed hauler |
Why the spread? The sources measure different things. Premier Tech includes design and permit in its totals; the Ontario Rural Wastewater Centre quotes the installed system; BuildersOntario’s guide is written for Simcoe County and Georgian Bay. None of them is a Kingston price list, which is why a site visit matters.
What a typical project includes before the digging starts
Before installation, you pay for a site evaluation, a design and a permit. These costs are separate from the tank, materials and labour.
| Step | Published range (source) |
|---|---|
| Site assessment and soil test | $200 to $500 (Premier Tech) |
| Site plan and system design | $1,500 to $5,000 (Premier Tech) |
| Permit | $500 to $1,000 (Ontario Rural Wastewater Centre) $600 to $1,500 (RenoQuotes, Ontario) $1,000 to $3,000 (Premier Tech) |
| Assessment, design and permit together | $2,000 to $8,000 allowance (BuildersOntario) |
Permit fees are set by each municipality. None of the Kingston, South Frontenac or Greater Napanee permit pages we checked lists a dollar amount, so ask your building department for the current fee before you budget.
Septic permits around Kingston: who issues them
In Ontario, septic systems are regulated under Part 8 of the Ontario Building Code. Around Kingston, the permit comes from the municipal or township building department. KFL&A Public Health stopped providing on-site sewage system services to the Frontenac and Lennox and Addington municipalities at the end of 2020 (Kingstonist, December 2020), so do not apply to the health unit.
- City of Kingston: the City issues the building permit for a sewage system with a daily capacity of 10,000 litres or less. Larger systems go through the Ministry of the Environment, Conservation and Parks. Applications go through the City’s DASH portal with a site evaluation, a site plan and the sewage system calculation page, plus a Cataraqui Region Conservation Authority permit if the system is near a water body (City of Kingston, sewage system permits).
- South Frontenac: the Township’s Building Officials handle permits for new, expanded and replacement systems (Township of South Frontenac).
- Central Frontenac, North Frontenac and Frontenac Islands: since September 1, 2023, South Frontenac no longer accepts or issues sewage system permits for these three townships (same South Frontenac page). Contact your own township office to confirm who handles your application today.
- Greater Napanee: applications go to the Town’s permit office, and an inspector contacts you within 10 business days. Inspections include a site visit to check the test holes, a final inspection before the system is covered, and a final grading inspection after backfilling and seeding (Town of Greater Napanee, septic and wells).
- Loyalist Township, Gananoque, Rideau Lakes and Prince Edward County: confirm the current process and fee with the municipal building department before you budget.
For the step-by-step process, read our guide to getting a septic permit and our overview of septic system requirements in Ontario.
What changes the price
System type
This is the biggest swing in the tables above. A conventional bed needs the least imported fill and equipment. A raised bed adds sand, stone and often a pump. An advanced treatment unit adds the unit itself, electrical parts and, in Ontario, a maintenance contract with the manufacturer’s authorized representative (SepticSmart, OMAFRA and Rideau Valley Conservation Authority). Our guide to the types of septic tanks explains the options.
Soil, rock and groundwater
Your soil decides the design. The City of Kingston asks for depth to rock, soil saturation, permeability and flood potential in every site evaluation, which shows how much those conditions drive the result. Deep, well-draining soil keeps things simple. Heavy clay, shallow bedrock or a high water table pushes the design toward a raised or treatment system, with more material and more excavation.
House size and daily flow
Bigger homes produce more wastewater and need a bigger tank and bed. More sand, gravel and backfill means a higher total (Premier Tech).
Tank material
Tanks are concrete or polyethylene. Premier Tech notes that concrete suits high water tables but generally costs more, while polyethylene is lighter, resists corrosion and is often more economical, especially on sites with difficult access.
Site access, clearing and restoration
Tight lots, long laneways and trees in the way slow the machines down and add hours. A wooded or sloped lot may need land clearing or grading before work starts. Long pipe runs between the house, tank and bed add material, and the job ends with topsoil and seeding over the bed. Premier Tech also lists tree clearing, extra material hauling and driveway or landscape restoration as costs to discuss before work begins.
Replacement vs new installation
A replacement is not always a full new system. If the tank is sound, a new leaching bed may restore the system, and a failed tank can sometimes be replaced on its own. Published ranges:
| Job | Published range (source) |
|---|---|
| Septic tank replacement only | $8,000 to $15,000 installed (Ontario Rural Wastewater Centre) $5,000 to $12,000 (BuildersOntario; RenoQuotes) |
| Leaching bed replacement | $15,000 to $25,000 for a clogged bed (Ontario Rural Wastewater Centre) Close to the cost of a full system (BuildersOntario) |
| Full replacement, conventional system | $25,000 to $40,000 (BuildersOntario) |
| Full replacement, raised, filter or pressure bed | $30,000 to $50,000 (BuildersOntario) |
| Septic tank pump-out | About $300 (Ontario Rural Wastewater Centre) $300 to $600 (BuildersOntario) About $500 (Premier Tech) |
Repairs need a permit too. SepticSmart advises contacting your local regulatory agency for the appropriate permit before a repair goes ahead. On a replacement, the old system also has to come out or be decommissioned, which you can see in our filter bed removal and septic install in Kingston. A new build on bare land, by contrast, often includes clearing and driveway work but no removal. For township-specific advice, read about septic tank replacement in Frontenac County.
Ongoing costs after installation
SepticSmart recommends having a licensed hauler or septic professional open and inspect the tank every three to five years and pump out solids and scum when required. Advanced treatment units also need the maintenance contract noted above. A holding tank is different: Premier Tech’s example puts pump-outs every 1 to 2 months, at about $540 each for a 6,000 litre tank hauled to a municipal plant in Ontario, which is why some Canadian jurisdictions discourage or prohibit holding tanks. Our septic inspection guide covers what an inspection checks.
See real septic projects
Numbers are easier to trust when you can see the work. Look at this new septic system installation in Odessa for a conventional build, or our Eljen septic system installation in Inverary for a treatment-style system on a tighter lot. More are on our septic projects page.
Frequently asked questions
How much does a new septic system cost in Ontario in 2026?
Published 2026 ranges run from about $15,000 for a conventional system on good soil to $67,500 for an advanced treatment system on a difficult site, including design and permit. Raised beds usually fall in between. The soil evaluation on your lot decides which system you need.
Who issues septic permits in Kingston?
The City of Kingston issues the building permit for sewage systems up to 10,000 litres per day; larger systems go through the Ministry of the Environment, Conservation and Parks. Outside the city, apply to your town or township building department. KFL&A Public Health no longer handles septic permits.
How much is a septic permit?
Published Ontario figures range from $500 to $1,000 (Ontario Rural Wastewater Centre) up to $1,000 to $3,000 (Premier Tech). Each municipality sets its own fee, so confirm the current amount with your building department.
Can I replace just the septic tank or the leaching bed?
Often, yes, if the rest of the system is sound. Published ranges are $5,000 to $15,000 for a tank and $15,000 to $25,000 for a clogged leaching bed. A repair or partial replacement still needs a permit.
Is a holding tank cheaper than a septic system?
It is cheaper to install, from about $8,000 in Premier Tech’s example, but it has no treatment and must be pumped every 1 to 2 months. Over time the pumping can cost more than the tank, and some jurisdictions discourage or prohibit holding tanks.
Get a free septic quote
Published ranges give you a starting point; a site visit gives you a real number. We will look at your lot, review the soil evaluation and design, and give you a written quote. Get a free quote or call M. Riddle Excavating at 613-545-7955, Monday to Friday, 7 to 5.