How do I find where my drain goes?

Author: Harmon Crooks  |  Last update: Monday, October 13, 2025

Most of the time, the sewer line will be sticking out of the ground and easy to spot; however, overgrown landscaping or objects close to the house could hide the cap. Or, you could have a buried sewer cleanout. Try searching on the side of the home that is closest to the main floor bathroom.

How to locate main drain in house?

For indoor main drains, you will likely find the cleanout in a bathroom or utility area. When dealing with a bathroom location, check the floor near the toilet. In this scenario, it might be a pipe protruding from the floor or it might be flush mounted into the floor. These main drains tend to have a threaded plug.

When water goes down the drain where does it go?

Where does the water go after you flush the toilet or drain the sinks in your home? When the wastewater flushed from your toilet or drained from your household sinks, washing machine, or dishwasher leaves your home, it flows through your community's sanitary sewer system to a wastewater treatment facility.

How to find your outside drain?

Finding an Outdoor Drain Cleanout

If you use a septic system, walk back towards your home and look for a protruding plastic pipe in your lawn or garden. If the cleanout is on the municipal sewer line, you won't see the drainage line. But follow a path through the yard to find the cleanout pipe.

How to find where a drain is blocked?

Finding Where Your Drain is Blocked

Simply take off the drain covers and look inside, if it's full of water then the blockage is after this drain chamber and if it's drained then the blockage is upstream of it. You can use this to narrow down exactly where the block is.

How Do You Locate a Sewer Line?

How do I find a clogged drain?

Signs of a Possible Clog
  1. When water or sewage backs up into a toilet, sink, bathtub, or anywhere inside or outside, especially in low spots, such as basement toilets and showers.
  2. When the drain makes a gurgling noise as other plumbing functions take place.

How do I find out where my drains are?

You generally have two options when it comes to finding the drainage system beneath your property. You can reach out to your local council and ask them to send you your drainage plan. The other option is to contact your local drainage experts and ask them to map your drains.

How can I find out where my drain field is?

Visual Inspection: Look for signs in your yard, such as lines of greener grass, dead grass patches, or depressed areas, which can indicate the location of the drainfield.

How do I know if my outside drain is blocked?

This blog will point out the key signs to look out for before discussing the steps to take when you think your drainage system is clogged.
  1. Slow Drainage. ...
  2. Unpleasant Smells and Odours. ...
  3. Gurgling Sounds Coming from Drains and Plug Holes. ...
  4. Raised Water Levels.

How do I find a drain pipe in my yard?

Septic systems: Walk back from the tank towards the home, looking for a plastic pipe vertically sticking up from the lawn or garden. Municipal system: The actual drainage line is usually not visible, so trace a broad path through the yard to find the drain cleanout pipe. The pipe is typically black or white.

Where do drainage pipes go?

Main Drain Line

All wastewater from your house is carried to the municipal sewer line by one main drain pipe that typically runs horizontally, but with a slight downward slope, under the lowest floor in your home out to the municipal sewer main or out to the septic field.

What happens to shower water when it goes down the drain?

When showering or bathing, the water that is used runs down the drain and into pipes connected to a plumbing system. From there, the water typically travels to a water treatment plant or a septic tank where it will be filtered and decontaminated before being returned to rivers, lakes, and oceans.

Where is the first place that water goes when it goes down the drain?

In a city, household drains connect to a larger pipe that carries wastewater into the city's underground collection system of sanitary sewers. As wastewater from homes, businesses and industries collects, sanitary sewer pipes get bigger and bigger as they near the wastewater plant.

How to find out where pipes are on your property?

Today, the best tool for the job is ground penetrating radar (GPR) as it accurately maps metal and PVC pipes.

How much does it cost to fix a clogged sewer line?

You will likely pay around $350 to $650 to have a plumber unclog a main sewer line unless you have complications like serious damage to the line.

Does every house have a sewer drain?

Every house should have one, although unfortunately, some houses don't. Not only do all homes not have plumbing clean-outs, often those that do have an insufficient number. The Licensed specialists at Augerpros Plumbing can provide the installation of extra clean-outs if needed, and in the recommended locations.

Can I unblock outside drain myself?

You'll need boiling water, a cup, bicarbonate of soda and some vinegar. Take the drain cover off and pour the boiling water down the drain. Add a cup of bicarb followed by a cup of vinegar, it should begin to fizz and bubble up. Replace the drain cover and repeat every couple of hours until the blockage is cleared.

Who is responsible for a blocked outside drain?

Generally speaking, you're usually responsible for drains inside the boundaries of your property, while the sewerage company is responsible for lateral drains, which are usually outside of property boundaries, and sewers. Although most sewers are now publicly owned, there are still some private or unadopted sewers.

How do plumbers fix blocked drains?

For the toughest of clogs, a plumber may use a hydro jet. This tool sends pressured water through pipes to break down drain build-up. This tool is often faster and more efficient than a typical drain snake. Hydro jets get rid of the clog, but they're also effective for cleaning drains.

Where is my drain located?

Most of the time, the sewer line will be sticking out of the ground and easy to spot; however, overgrown landscaping or objects close to the house could hide the cap. Or, you could have a buried sewer cleanout. Try searching on the side of the home that is closest to the main floor bathroom.

How far down are drain fields buried?

Generally speaking, septic drain lines are buried between 18 and 36 inches underground, and the pipes are surrounded by gravel and sand to aid in the filtration and water treatment process. Some septic drain lines may be buried just 6 inches under the ground.

How do I know if my drain field is clogged?

When the drainfield fails, or is saturated with water, sewage may backup into the home. Wet, soggy areas may develop above or near the drainfield and you may see spongy bright green grass over the area. There may also be odors near the tank or drainfield.

How do you find out where a drain is clogged?

You can drain the pipe, fill the partially blocked pipe with hot water, and use your forearm to feel the pipe. Alternatively, instead of using your forearm, you can opt for other tools like an infrared camera or a temperature gun if you're in a position to get one.

How do I find my drain field?

Use your septic tank to point the way.

It will point in the general direction of an area large enough to house your drainfield. Once you have a general sense of where your drainfield might be, look for an open area clear of trees and buildings. This is likely the location of your septic drainfield.

How do I find out where my surface water goes?

A simple way to determine where your surface water drains are is by observing them. After heavy rain, water your garden or wash your car, and watch where the water flows. This can help you pinpoint the drainage point.

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