Understanding Water Mains and Sewer Lines: What You Need to Know

When it comes to plumbing, two essential components play a major role in your home's water and wastewater systems: the water main and the sewer line. Whether you're building a new home, upgrading your current system, or deciding between a septic system and public sewer, understanding these two vital infrastructure elements is key.



A blue pipe is laying in the dirt in a trench.

What Is a Water Main?

The water main is the primary pipeline that delivers clean, potable water to your home from your local municipality or water supplier. This underground pipe connects your home to the public water supply and ensures that fresh water flows to your faucets, shower, and appliances.

Signs of a Water Main Issue

Since water mains are buried underground, detecting problems early can be tricky. Here are some signs that your water main may need attention:

  • Sudden drop in water pressure
  • Unexplained increase in water bills
  • Wet spots or pooling water in your yard
  • Discolored or murky water

If you notice any of these issues, it’s crucial to contact a professional plumber, like Riverway Plumbing, to diagnose and repair the problem.


A person wearing blue gloves is holding a piece of wood.

What Is a Sewer Line?

Your sewer line is responsible for carrying wastewater away from your home and into a public sewer system or a private septic system. If your home is connected to the city sewer system, your waste travels through underground pipes to a centralized treatment facility. If you have a septic system, the wastewater is treated on your property using a septic tank and drain field.

Sewer vs. Septic: Which Is Right for You?

If you live in a rural area, a septic system may be your only option. However, if you’re in a community with access to public sewer lines, you may have the choice between the two. Here’s a comparison to help you decide:

Feature Septic System Public Sewer
Cost One-time installation cost but no monthly sewer fees Monthly sewer fees, but maintenance is covered by the city
Maintenance Requires regular pumping and upkeep Minimal homeowner maintenance
Environmental Impact Returns treated water to the ground, replenishing groundwater Uses chemicals and energy to treat wastewater
Property Restrictions Requires space for a drain field No special land use restrictions
Risk of Failure Can clog or fail if not maintained properly Rarely fails, but backups can occur

Signs of a Sewer Line Problem


A failing sewer line can cause serious issues. Look out for:


  • Slow drains throughout the house
  • Foul sewage odors in or around your home
  • Gurgling noises from drains or toilets
  • Wet or sunken patches in your yard


Ignoring sewer line problems can lead to costly repairs or even property damage. If you suspect an issue, Riverway Plumbing can inspect and resolve the problem before it gets worse.


Need Help with Your Water or Sewer System?


Whether you need a water main repair, a sewer line inspection, or help deciding between a septic system and public sewer, the experts at Riverway Plumbing are here to help. Our experienced team provides reliable, high-quality plumbing solutions tailored to your needs. Call us today to schedule a free estimate at (812) 327-8080.

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