The pump truck pulls into your driveway. The driver hops out, looks at your yard, and asks the question you were hoping he wouldn’t: “Where’s your tank?”
You point vaguely toward the backyard. He raises an eyebrow. You both know you’re guessing.
This happens more often than you’d think. We pump septic tanks across Kawartha Lakes every week, and at least a few homeowners each month have no idea where their tank is buried. It’s not their fault. Nobody hands you a treasure map when you buy a property. But knowing your septic tank location saves time, saves money, and prevents the kind of blind digging that tears up your yard for no reason.
Here are five methods to find your septic tank, starting with the easiest.
Why You Need to Know Where Your Tank Is
Before we get into the methods, let’s talk about why this matters.
Your septic tank needs to be pumped every 3 to 5 years. The technician needs to find the lid to do that. If they have to spend an hour locating and digging it up, you’re paying for that time. In some cases, that adds $150 to $200 to your pumping bill.
Knowing where your tank sits also keeps you from accidentally driving over it, building on top of it, or planting deep-rooted trees right next to it. All of those things cause damage that’s expensive to fix. Good septic maintenance starts with knowing where everything is buried.
If you’re buying a property in the Kawartha Lakes area, locating the tank should be part of your septic inspection. Don’t skip it.
Method 1: Check City Records
This is the fastest way to find your septic tank, and it doesn’t require you to step outside.
When your septic system was installed, the installer filed a permit with the municipality. That permit file usually includes a site plan showing where the tank and drain field were placed on the property. In the City of Kawartha Lakes, you can contact the building department to request your septic permit records. The City of Kawartha Lakes septic permits page has contact information and details on how to access records.
For older properties, the records might not exist or might be vague. Homes built before the 1970s sometimes have no paperwork at all. But it’s always worth checking first.
A couple we helped in Fenelon Falls last spring had been searching their yard for two days with a metal rod before they thought to call the city. The building department emailed them a site plan within 48 hours. The tank was exactly where the drawing showed it, about three metres from the back wall of the house. Two days of poking around the yard could have been avoided with one phone call.
Pro tip: If you find records, take a photo and save it to your phone. You’ll want it the next time a service truck shows up.
Method 2: Follow the Sewer Pipe
Every septic tank connects to your house through a main sewer pipe. Find that pipe, follow it outside, and it’ll lead you straight to the tank.
Here’s how to do it:
- Find the pipe in your basement. Look for a 4-inch (10 cm) pipe leaving the house, usually at or below floor level. It typically exits through the foundation wall on the side of the house facing the backyard.
- Note which wall it exits through. Go outside and stand at that wall.
- Walk in a straight line away from the house. The sewer pipe usually runs in a straight line from the foundation to the tank. Septic tanks are commonly placed 3 to 10 metres from the house.
- Look for a slight depression or raised area along that path. The tank is buried somewhere along that line.
The pipe has to maintain a downhill slope from the house to the tank, so the tank will always be at a lower elevation than where the pipe exits the foundation. If your yard is flat, the tank is usually fairly close to the house. If the yard slopes away, the tank may be further out.
This method works well for most homes in Lindsay, Bobcaygeon, and surrounding areas where the terrain is relatively straightforward.
Method 3: Look for Visual Clues in Your Yard
Your yard often tells you exactly where the tank is. You just have to know what to look for.
Greener grass in one rectangular area. A buried septic tank can create slightly different growing conditions above it. The soil is thinner over the tank, so grass may be greener or browner than the rest of the yard, depending on moisture levels and the time of year.
A slight mound or depression. Over time, the ground above a septic tank may settle or remain slightly raised compared to the surrounding area. Walk your yard slowly and pay attention to any subtle changes in elevation.
Patches where snow melts first. In winter, the heat generated by the biological activity in your septic tank can melt snow faster directly above it. If you notice a rectangular patch of bare ground after a light snowfall, that’s probably your tank.
Lids or cleanout caps. Some tanks have risers installed that bring the access lid up to ground level or just below it. Look for round green or black plastic caps at the surface. If you see one, you’ve found it.
No trees or shrubs in a suspicious rectangular area. Previous owners may have known not to plant anything over the tank. An oddly empty patch of yard is worth investigating.
These visual clues won’t work on every property. But they’ve helped us find tanks on countless properties across Kawartha Lakes, especially on rural lots where records are incomplete.
Method 4: Use a Soil Probe
If the first three methods haven’t given you a definitive answer, a soil probe will.
A soil probe is a thin metal rod (about 1.2 metres long) that you push into the ground. You’re feeling for the hard surface of a concrete, fibreglass, or plastic tank buried below. You can buy one at a hardware store for around $30, or use a thin piece of rebar in a pinch.
Here’s the process:
- Start along the line from Method 2. You’ve already identified the general direction the sewer pipe heads from your house. Begin probing along that path.
- Push the probe into the soil every half metre. Apply steady, firm pressure. You’re pushing through topsoil and fill material.
- Listen and feel for a solid strike. When the probe hits the tank, you’ll feel a sudden hard stop and hear a dull thud. It’s distinctly different from hitting a rock, which feels and sounds sharper.
- Map the edges. Once you hit the tank, probe around that spot to determine the tank’s outline. Most residential septic tanks in Ontario are roughly 1.5 metres wide and 2.5 metres long.
A word of caution: Don’t probe aggressively near the tank’s edges. Older concrete tanks can have weakened walls, and you don’t want to puncture the top of a deteriorating tank. Push firmly but carefully.
Also, call Ontario One Call (1-800-400-2255) before you probe. You need to know where buried utilities are before pushing metal rods into the ground. This is free and required by law.
Need help locating your tank? Call us at (705) 242-0330 or book online. We locate tanks across Lindsay, Bobcaygeon, Fenelon Falls, and Coboconk every week.
Method 5: Call a Professional with a Locator
When the other methods don’t work, or you’d rather not spend your Saturday poking holes in the yard, call a professional.
Septic service companies use electronic locators and transmitters to find buried tanks. The most common method involves flushing a small radio transmitter down a toilet or cleanout. The transmitter travels through the sewer pipe and stops when it reaches the tank. A technician then walks the yard with a receiver and pinpoints the transmitter’s location from above ground. It’s fast and accurate.
Some companies also use ground-penetrating radar or camera inspections to map the entire system, including the pipe runs and the drain field.
A homeowner in Coboconk called us last year after buying a 1960s cottage. There were no records at the municipality. The property had been renovated twice, and the basement plumbing had been rerouted. Following the sewer pipe from inside led to a wall that had been drywalled over during one of the renovations. Visual clues in the yard showed nothing because the lot was heavily wooded. We flushed a transmitter and found the tank in about 15 minutes. It was buried over a metre deep, tucked behind a stand of cedars on the east side of the cottage. Nobody would have guessed that location.
Professional locating typically costs between $100 and $300, depending on the complexity. It’s worth every dollar when you’ve exhausted the DIY options.
How to Mark It Once Found
Finding your septic tank once is enough. Make sure you never have to find it again.
Here’s how to mark it permanently:
- Install a riser. A riser is a plastic or concrete ring that extends the tank’s access lid up to ground level. It makes future pumpings faster and cheaper because the technician doesn’t have to dig. Most septic companies in the Kawartha Lakes area can install one during your next pumping visit.
- Record the measurements. Measure the distance from the tank lid to at least two permanent reference points, like the corner of your house and a fence post. Write these measurements down and keep them with your home records.
- Take a photo. Before you backfill, take a photo of the exposed lid with the house visible in the background. Save it to your phone and email it to yourself.
- Mark the spot on a site plan. Draw a simple sketch of your property showing the tank location, the sewer pipe route, and the drain field. The Ontario government’s septic system page recommends keeping a record of your system layout for maintenance purposes.
- Place a decorative marker. A large flat stone, a small garden ornament, or even a specific type of plant can mark the spot without being an eyesore.
Future you will be grateful. So will the next pump truck driver who pulls into your driveway.
FAQ
How deep is a septic tank usually buried?
Most septic tanks in Ontario are buried with the top of the tank between 30 centimetres and 1 metre below grade. In some cases, especially on properties with grading changes or renovations, tanks can be deeper. If your tank is more than a metre deep, installing a riser is a smart investment.
Can I use a metal detector to find my septic tank?
It depends on the tank material. Metal detectors work well on steel tanks, which were common before the 1970s. They won’t detect concrete, fibreglass, or plastic tanks. However, most tank lids have metal handles or rebar reinforcement that a sensitive metal detector can pick up. It’s worth trying, but don’t rely on it as your only method.
How far from the house is a septic tank?
Typically 3 to 10 metres. Ontario building codes require minimum setback distances from the house foundation, property lines, wells, and water bodies. Your specific distance depends on when the system was installed and the local regulations in effect at that time. Properties in Lindsay, Bobcaygeon, Fenelon Falls, and Coboconk all follow the same Ontario Building Code requirements.
What if I still can’t find my septic tank?
Call a professional. Seriously. You could spend days probing and digging in the wrong spot. A trained technician with the right equipment can locate almost any tank in under an hour. If there’s truly no tank, that’s important to know too, because it might mean your property is connected to a holding tank or an older system that needs attention. Call us at (705) 242-0330 and we’ll sort it out.
Find It, Mark It, Forget About It
Knowing where your septic tank is buried isn’t exciting. But it’s one of those things that saves you real money and real headaches over the years. Whether you track it down through city records, follow the pipe from your basement, or call someone with a locator, the important thing is that you do it.
Once you find it, mark it. Install a riser if you can. Keep a record. Then get on a regular pumping schedule so your system keeps running the way it should.
We locate and pump septic tanks across Lindsay, Bobcaygeon, Fenelon Falls, and Coboconk every week. If you need help finding your tank or you’re overdue for a pumping, call (705) 242-0330 or book online.