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How To Locate Septic Tank Field Lines [Quickly & Easily]

Identifying and understanding the location of the septic tank is critical for managing and caring for your septic system. It is also critical that you are aware of the location of your field lines if you have to excavate for some of your projects in the future.

How to locate septic tank field lines?

Look for humps in the earth where dirt settles to discover the septic tank field lines. A septic tank schematic of the drain field is also available upon request. If you are still unable to locate the septic tank drain pipes, you can use a septic tank locator.

If you have some spare time, we’ve written a detailed guideline that goes over all of these stages.

Let’s get started!

Understand How Your Septic System Is Set Up

Before you start, you should have a basic understanding of how the septic system works. So that you look in the right places. 

The solid waste is stored in a tank in your septic system. Your liquid waste is pumped into the leach field and then drained.

Additionally, the tank contains a baffle that aids in the separation of these two forms of waste. The liquids are then pumped into the earth via a sewer line linked to pipes in a gravel bed, where it is absorbed.

Locating the Field Lines of Your Septic Tank

You don’t want to build concrete over your field lines or grow trees near them. So knowing where they run is important.

Obtaining a schematic is the easiest method to do this. This will show you where the drain field is so you can avoid digging or planting in that region.

Not everyone is so fortunate as to be able to receive such a diagram. 

As a result, we’ve created a list of strategies for you to attempt in order to locate your field lines.

Follow the Drain Lines

The quickest and most accurate method of locating the septic tank is to begin at the drain lines that lead from our home. 

Because your plumbing drain pipes are linked to your septic tank. Sometimes, copper pipe is joined with pvc. You can follow them to find your way around. You can anticipate that the tank will be placed approximately twenty feet away from the exterior of your house.

Continuing from the alternative side of the tank, the drain pipes will lead into your drain field. Examine the gradient of your property to determine the location of your leach field.

Make sure that you are not digging blindly or using heavy gear to seek for the pipes since this could result in them being damaged.

If you are yet having trouble, you may always try using a septic tank tester to locate the source of the problem. You can insert the narrow metal probe into the dirt until it comes into contact with your tank. 

Following the tank, you may come across the edges, which will finally take you to the pipelines.

You can purchase a septic tank tester from these recommended products below:

product 1
product 2

These are the most efficient alternatives available. So, you may use it at your leisure!

Look for Natural Indicators

If you notice a marshy or moist sort of place that never appears to clear out. This could be a sign that the septic drain lines are in the wrong spot or blocked. 

If your drain line is blocked, the water will accumulate on your drain field. Then you’ll have to clean grown mold.

Another indicator is that your lines are directly below something. Is there a green striped plant or lawn with green grass surrounding it? This could indicate that your lines are directly below it.

One other thing you may look for in your lawn during the winter is the absence of cold or snow in a certain region of the yard.

Obviously, this can only operate if you live in a region where there is snow and frost on the ground. If you notice any of these regions, it is possible that they are the locations of your field lines.

Another natural indicator to look for is parallel shallow depressions. This small depression is most frequently found in drain fields. However, if your system is more complex, you may not notice these parallel depressions.

Examine Your System’s Diagrams

If your septic system was built with a permit, you would call your local health agency to get schematics or blueprints of the system. 

The horizontal lines diagram should include all of the specifics of the drain field. As well as the structure, components, and placement of the drain field.

If you’re still having trouble, you also can ask for a database search for your home. A form called “Request Copy of Septic System Blueprints” should be available. 

This form can be completed and returned to your local health department. If the blueprints are available, they will be mailed to you. If they don’t, you’ll have to contact the previous owner of the property.

Check the Distribution Container

Some septic tanks have an additional distribution box downstream, just a few feet from the tank, but this is not universal. 

Water will flow more easily into the excavations through the pipelines and the ports thanks to this storage container.

If you have two distribution boxes, the lid will notify you which way the ports are connected. The ports are oriented in the direction of the drain field lines. 

A probe can also be used to locate the distribution box. If you’re using a tool, make sure not to press it too forcefully into the panel to avoid damaging it.

Septic System Mapping

It’s a wise idea to chart your septic system once you’ve located everything you require so that you don’t have to go through this process again.

Find the Location of Your Septic System

Identify your septic tank with a probe, but gently. Once you locate the tank, follow it to the house’s nearest edge.

Calculate the Distance to Your House

Once you’ve located the edge, calculate how far the reservoir is from your house. Make a note of it. Make a mental note of the specific location as well.

Trace the Septic Tank’s Borders

Trace the tank’s perimeter with the probe and stake the corners. Then measure the tank from corner to corner.

Locate the Drains

The drain lines connect to the septic tank on the opposite side of the home. Locate and count the drain pipes in the drain field.

Septic tanks can have a variety of issues. It’s possible that your septic tank needs to be pumped, pumping might be costly.

Hopefully, that will be enough.


Question: What is the average depth of a septic system’s lateral lines?

Answer: Drainfield trenches are typically 18 – 35 inches in depth. With a total ground cover over the waste area of 36 inches in a typical situation.

Question: Is it possible to walk on a leaching field?

Answer: One well drain field allows your family to walk without the worry of meeting pools of affluent and deadly bacteria. Cycles and pedicabs are also permitted because they do not compress or disrupt the soil.

Question: How long does it take for a drain field to damage?

Answer: Consider the drain-life field’s expectancy as well. A leach field can persist for fifty years or more if it is properly maintained. Though durable, concrete septic tanks do have a limited lifespan.

Final Word

That was all I had to say about how to locate septic tank field lines. Hopefully, you now have a better idea of how to get it done. Isn’t it obvious? A specialist isn’t necessary for a basic task like this.

That’s all for now. I’ll get back to you as soon as I can with more solutions.

Best wishes for resolving the problem!