What are the three types of sewer lines?

Author: Christy Stoltenberg  |  Last update: Friday, June 19, 2026

There are three main types of sewer systems: Sanitary sewers, stormwater sewers and combined sewers. Some households are attached to septic systems, but these systems do not attach to offsite sewer systems.

What are the different types of sewer pipes?

In most new sewer line installations, you may find yourself being steered in the direction of PVC or ABS plastic pipe over clay and cast-iron. While the plastic pipe is undoubtedly easier to work with, clay and iron have strong points, such as longer lifespans and strength (for the iron, not for clay).

What is the most commonly used sewer pipe?

PVC Pipes. PVC pipes are a popular choice for sewer lines due to their affordability and ease of installation.

What are the different types of sewer connection?

What type of sewer connection you need: Foul water sewer: carries wastewater from toilets, baths, showers, sinks, dishwashers, and washing machines. Surface water sewer: carries rainwater from rooftops, roads, driveways, and paved areas. Combined sewer: carries both foul water and surface water.

What is a common sewer line?

What is a common sewer line? A common sewer line is a lateral house drain connection that is shared by more than one house. Unless very large buildings, or a great many houses, are connected the size of the shared sewer line is still 6″ in diameter. The material is typically extra heavy cast iron pipe.

A House Sewer Line Has 3 Types: Learn About Sewer Lines

What is your main sewer line?

The main line, also known as a sewer line or a main sewer line, is the pipe that goes from your home to the city connection or the septic tank. Everything that goes down your shower, sink, garbage disposal, and toilet runs through this pipe.

Can two houses share the same sewer line?

Neighbors often share sewer lines, leading to potential disputes or joint resolutions. Visible signs like multiple properties with sewer covers in close proximity or shared sewer bills might indicate that your sewer system is interconnected with others.

What are the three types of sewers?

There are three main types of sewer systems: Sanitary sewers, stormwater sewers and combined sewers. Some households are attached to septic systems, but these systems do not attach to offsite sewer systems.

How do I know what type of sewer system I have?

How to Determine Your Sewer Line Type
  1. Check Your Home's Age. The age of your home can give you a clue about the type of sewer line installed. ...
  2. Consult Property Records. Look at your property's building records or home inspection reports. ...
  3. Inspect the Pipes. ...
  4. Give Us a Call!

What is the difference between a sewer line and a sewage line?

Can sewerage and sewage be used interchangeably? No! Sewerage and sewage are regularly used interchangeably, however, this is actually incorrect. Sewage refers to the waste that is discharged, whereas sewerage/sewers are the structure that the discharge goes into.

What is the best pipe for residential sewer line?

PVC pipes can work for most residential and commercial applications. They are more versatile because they come in diverse shapes and sizes. PVC pipe is more resistant to harsh chemicals than other sewer system pipe materials. PVC's flexibility allows it to withstand ground settling.

What is an old sewer pipe called?

Understanding Orangeburg Pipes

Orangeburg pipes, also known as bituminous fiber pipes, were widely used as sewer pipes in the United States during and after World War II, especially from the 1940s to the early 1970s. These pipes were made from layers of wood pulp impregnated with coal tar pitch.

How to unclog a clogged sewer line?

Your step-by-step guide: How to clear a main sewer line clog
  1. Loosen the cap on the drain pipe. ...
  2. Allow any sewer buildup to come out of the drain. ...
  3. Gently feed the auger cable into the main line drain. ...
  4. Run the auger until the clog is broken up. ...
  5. Hose out leftover debris. ...
  6. Pull the auger cable back out of the main line drain.

What is the most common type of sewer?

Gravity sewerage systems are the most common type used in residential areas. Gravity systems rely on the natural downward flow of wastewater. Pipes are laid at a slight slope, allowing gravity to guide the flow from your home to the main sewer line.

What are the three types of pipes?

There are five main types of plumbing pipe materials that are still in use today: copper, galvanized steel, polyvinyl chloride (PVC), acrylonitrile butadiene styrene (ABS), and cross-linked polyethylene (PEX).

Are sewer lines 3 or 4?

SEWER LINES ARE ABOUT FOUR INCHES IN DIAMETER

Main sewer lines are smaller than most homeowners imagine. Building requirements typically require that they are at least three inches in diameter, and most sewer lines are only four inches across.

Do you have to pay sewerage if you have a septic tank?

In many cases, it is more cost effective to install a new septic system than it is to connect municipal sewer lines to your property. Septic systems can save you money each month. They are not linked to the municipal sewage system, so there are no monthly sewage or water bills to operate one on your property.

What is considered the main sewer line?

What is a Main Line? To put it simply, your main line is your sewer line. It's a line located underground that carries all wastewater from your home to a municipal connection or septic tank, not just toilet water.

Who pays for septic inspection when buying a house?

Who pays for septic inspections when buying a house? In most cases, you as the buyer are responsible for paying for a septic inspection.

How many sewer lines does a house have?

Not in most homes. Ordinarily, you have one sewer line that is intended to primarily carry what's known as “black” water; water from the toilets into either the city sanitary sewer system or into your own septic tank.

How can I lower my sewer bill?

Install Low-flow Showerheads and Faucets: Switching to low-flow showerheads and faucets can save you up to 50% of your water usage, which will reflect positively on your sewer bill. Collect Rainwater: Instead of using your hose to water your lawn or garden, consider investing in a rain barrel.

How do you tell if you have a combined sewer?

Combined Drainage System A combined system handles both surface and foul water. Here's what to look for: Shared Pipes: If you notice that both rainwater and wastewater are flowing into the same drainage system, you likely have a combined system. Older Properties: These systems are more common in older buildings.

What is the sewer line from the private owners property to the local main called?

The Private Sewer Lateral, also known as “Sewer Lateral” and “Service Lateral Line,” is a pipe that conveys a property's wastewater to the public sewer main in the street. Maintenance and repair of the full length of the Private Sewer Lateral is the responsibility of the property owner.

How far down is a residential sewer line?

For instance, residential sewer line depth ranges from 18 to 30 inches. However, city sewer line depths are different. Your city's sewer lines must always be deeper than the deepest residential pipe to allow waste to flow downhill. As such, these lines can go as deep as needed.

Can my neighbor's sewer line affect mine?

Understanding the Shared Sewer Line Responsibility

However, the sewer line portion between the main and the property line is typically considered a shared responsibility. This means that any issues with that portion of the line, such as blockages or damage, must be addressed by all parties involved.

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