Septic Re-Inspection Program in Ontario: What Happens, What It Costs, What If You Fail

Your Township Sent a Septic Re-Inspection Letter. Now What?

First, breathe. A septic re-inspection program letter is not an accusation and it is not a bill for a new system. It means your property falls inside an area the township has to check, or has chosen to check, on a schedule. Most systems pass. Some fail on small things. A smaller number turn out to be done.

The inspector is looking for one thing: is sewage going where it should, or is it showing up where it should not? Everything on the checklist comes back to that question.

We have been building and doing site work in Simcoe County since 1979, and four of the busiest programs in Ontario sit in our backyard: Tiny, Innisfil, Oro-Medonte and Severn. Here is what actually happens, what it costs, and what to do if your letter comes back with a red mark on it.

Mandatory or Discretionary? It Matters Less Than You Think

There are two kinds of program in Ontario, and the letter usually does not say which one you are in.

Mandatory programs come from the province. The Building Code requires maintenance inspections every five years for systems within 100 m of the Lake Simcoe shoreline and the watercourses that feed it, and for systems in drinking-water source protection areas (wellhead protection areas and intake protection zones) under the Clean Water Act. That is why Innisfil, Oro-Medonte, Ramara, King and Brock all run five-year cycles. The township does not get a vote on these.

Discretionary programs are a township choice, passed by by-law under Division C, Section 1.10 of the Code. Lakeside municipalities in cottage country use them because their lakes are their tax base. Rideau Lakes passed one in 2015. Severn ran one on its rivers and lakes until council suspended the rest of it for five years on June 17, 2026.

Either way, once you are in the program, the inspector has the legal right to come onto your land at a reasonable time. You do not have to be home. You do have to fix what they find.

Septic Re-Inspection Program Details by Township

Every program below was checked against the municipality’s own page in October 2026. Fees change every budget year, so treat these as a starting point and read your own letter.

Ramara’s $150 is collected as $30 a year on your final tax bill over the five-year cycle. Innisfil may waive its fee for an advanced treatment unit if you send in your maintenance contract. If your township is not on this list, call the building department and ask one question: “Is my roll number in a maintenance inspection program?” You can also pull your own permit history first. Our septic record search guide shows you how.

What the Inspector Actually Looks At

Stage one is almost always a walk-around. Innisfil says plainly that its inspector will not dig up or disturb the ground. Muskoka Lakes’ Phase I takes 10 to 15 minutes. Deeper programs, like Minden Hills, Dysart and Muskoka Lakes Phase II, open the tank and measure what is in it.

Pass, Fail, and the Grey Area in Between

Here is the part that surprises people. A system can work perfectly and still fail. Innisfil spells it out: a broken tank lid or excess vegetation on the bed is a fail until it is fixed. That is a cheap fail. Annoying, but cheap.

The results usually land in one of four buckets. Rideau Lakes uses these exact categories, and most programs work the same way in practice:

1. No concern. You get a letter and forget about it for five years.
2. Remedial work required. Replace a lid, cut the trees, move the firewood off the bed, fix a baffle, pump the tank. Rideau Lakes found that about 29% of its 2025 inspections landed here.
3. More information required. No records on file, or the inspector could not find the tank. You may need to dig up the lids or produce a pump-out report.
4. Repair or replacement required. The bed has failed, the tank is steel and rotted, or sewage is surfacing. In Rideau Lakes’ 2025 season, more than 50 of 347 inspections ended here.

Those numbers are in line with the wider picture. A Federation of Ontario Cottagers’ Associations report, built on more than 370 systems serviced by ESSE Canada, found major deficiencies in 41% of them, and 56% were over 20 years old (Cottage Life).

If you landed in bucket 4, read our failed septic inspection guide next. It walks through the permit, the design and the order of operations.

How Long You Get to Fix It

There is no province-wide number. The deadline is whatever your deficiency letter says, and it varies with how serious the problem is. Severn puts the deadline right in the report, lets you call when the work is done, and books a re-inspection. Miss it and Severn can grant an extension where appropriate, or issue an order under the Building Code.

Ignore it and it gets expensive fast. Oro-Medonte says properties that miss deadlines face orders and further legal action. Dysart charges a $500 monthly fee on non-compliant orders. That is $6,000 a year for doing nothing, which is a strange way to save money.

Is a Maintenance Contract Mandatory for My Advanced Treatment Unit?

Yes. If you have anything other than a plain septic tank in front of the bed — Ecoflo, Waterloo Biofilter, Bionest, Norweco, Aquarobic, Advantex, Clearstream and the rest — the Building Code says you cannot operate it without a servicing agreement. The Rideau Valley Conservation Authority quotes the rule from Article 8.9.2.3: “No person shall operate a treatment unit other than a septic tank, unless the person has entered into an agreement.”

The RVCA annual compliance page is the clearest explanation in the province. You renew the contract every year, the provider services the unit to the manufacturer’s spec, and you send proof to the approval office. No current contract means you are in violation of the Code, and an Order to Comply is the last resort.

In the re-inspection programs, that contract is your get-out-of-jail card. Innisfil may waive its fee for it. Oro-Medonte accepts a maintenance agreement in place of a tank inspection report. Ramara accepts a servicing company’s maintenance report instead of a pump-out certificate. And when you sell, RVCA says the contract must be disclosed to the buyer.

For the brand-by-brand picture, see our advanced treatment unit comparison.

What a Re-Inspection Really Costs You

The inspection fee is the small number. The real cost depends on which bucket you land in.

Details on each line are in our pumping cost guide and the replacement cost hub. Some conservation authorities and the County of Simcoe have offered funding help; Innisfil and Oro-Medonte both point owners to them, so ask before you sign anything.

Local notes for the Simcoe programs are on our Tiny Township, Innisfil and Oro-Medonte pages.

Sources: Town of Innisfil, Township of Tiny, Oro-Medonte, Severn, Ramara, Minden Hills, Rideau Lakes 2025 report, RVCA ATU compliance, Cottage Life / FOCA. Planning estimates only. Final decisions belong to your local building department, health unit or approval authority.