When it comes to your home’s plumbing, there are two parts that are more important than any other: the water line and sewer line. But because the issue symptoms with both of these lines can look quite different, it’s often difficult to tell at a glance which one is failing.
In this guide, we’ll explain the difference between your water line vs sewer line, look at the symptoms to be aware of for each, and offer some guidance on whether repair or replacement makes the most sense.
Main Takeaways
- Water lines are pressure-powered pipes that supply fresh water to your home from a street water main.
- Sewer lines transport waste and wastewater away from your home and are powered by gravity.
- Pooling water, sewage backups, water bill increases, and low pressure can all indicate a damaged sewer or water line.
- Deciding whether to repair or replace a damaged sewer or water line comes down to the severity of the damage, the line’s age, and the material of the pipe.
Water Line vs. Sewer Line: Key Differences
The main differences between your sewer and water line is what it transports and the direction it flows. The water line brings in fresh water from the municipal grid, while the sewer line sends wastewater out of your home and into the sewage system or your septic tank.
There are other differences, too — water moves through the water line due to pressure, while sewage moves because of downward forces from gravity. Water lines are made from materials that can withstand high water pressure, such as PVC, PEX, or copper. Sewer lines are much wider and use materials designed to resist blockages, such as PVC, ABS, cast iron, or clay.
What Is a Water Line?
What is a water line? Your water line brings in fresh, usable water from an external source (usually a street main line), which is then supplied to your faucets, fixtures, and appliances. It keeps the water under steady pressure so it can flow on demand. Water lines are almost always buried beneath the ground, and are connected to a water meter (which measures usage) and a shut-off valve in case of emergencies.
How to tell if a water line is broken
Because water lines are buried out of sight, it can be hard to diagnose a hidden leak if you don’t know what you’re looking for. Here’s how to tell if a water line is broken:
- Unexplained spikes in water consumption
- Dropping water pressure
- Soggy, saturated parts of your yard
- Pooling water around your home
- Cracks or sinking spots on your driveway or walkways
- Faint hissing sounds near the water meter or main line
A broken water line can be disastrous. Not only will it waste untold amounts of water, but the steady leak can damage your landscaping, cause slab leaks in your foundation, promote the growth of hazardous mold, and eventually render your home’s plumbing systems useless once the damage becomes severe enough.
What Is a Sewer Line?
What is a sewer line? Your sewer line is the counterpart to your water line, responsible for transporting waste and wastewater out of your home and into the municipal sewer system (or a septic system). Your toilets, sinks, shower drains, and washing machine all feed into this single pipe. Unlike a water line, sewage lines don’t operate under pressure, and instead flow thanks to gravity.
Broken sewer line symptoms
A broken sewer line can become a smelly mess or even a health hazard in a relatively short amount of time. Here’s how to know if a sewer line is broken:
- Slow drains in multiple fixtures in the home
- Sewage backups
- Gurgling sounds from toilets or drains
- Foul odors from drains
- Unusually lush or green patches of grass
- Increased presence of pests
If you notice any of these broken sewer line symptoms, time is of the essence to get the sewer line repairs you need. Ignoring the issue will only worsen the problem, with sewage freely flowing out of the damaged pipe and into the surrounding earth, or worse, back into your home.
When to Repair or Replace Water Line vs Sewer Line
Considering what happens when a water line breaks or when a sewer line fails, it’s no wonder that either of these issues requires immediate attention. But is it better to repair or replace a sewer line and/or water line? Making this decision mainly depends on the severity of the damage, the age of your pipes, and the materials they’re made of.
For water lines, it’s better to repair them if:
- The damage is localized and isolated to a specific area.
- The pipe is made of a relatively new, durable material, such as PEX, PVC, or copper.
- The leaking area can be repaired with minimal excavation or with trenchless pipe repair.
On the other hand, water lines should be replaced if:
- The pipe material is outdated, such as galvanized steel, polybutylene, or lead.
- Multiple parts of the pipe are failing or damaged.
- The damage is widespread, such as damage caused by shifting soil or severe pipe freezing.
For sewer lines, you’re better off repairing if:
- It has isolated tree root damage that can be repaired with trenchless methods.
- It has small, localized cracks or offset joints.
- The line is less than 20 years old.
Sewer lines should be replaced if:
- The pipe has a major sag or a crushed section.
- The pipe is made of obsolete materials, such as clay or old cast iron.
- You have chronic sewage backups.
Get Help with Your Sewer and Water Lines
The team at Frank’s Repair Plumbing provides comprehensive line repair and replacement services in Amarillo and the Texas Panhandle, including trenchless services for minimal disruption to your property. For more information or to have your systems inspected straight away, don’t hesitate to get in touch.
Frequently Asked Questions
Can a water line and sewer line problem happen at the same time?
Water line and sewer line issues can definitely happen simultaneously. This is common during severe freeze-thaw cycles or when soil shifts unexpectedly.
What is the lifespan of a typical water pipe?
Water pipe lifespans depend on the material the pipe is made of. Copper lasts 50 to 70 years, PVC lasts 50 to 100 years, PEX lasts 40 to 50 years, cast iron lasts 75 to 100 years, and galvanized steel lasts 20 to 50 years.
How often do house water pipes need to be replaced?
House water pipes generally need to be replaced every 50 to 100 years. If major damage occurs, you may need to replace your water line sooner than this.
What is the average lifespan of a sewer line?
Sewer line lifespans vary by material. PVC and ABS last 75 to 100 years, cast iron lasts 75 to 100 years, clay lasts 50 to 60 years, and outdated Orangeburg piping lasts 25 to 50 years.
Can you repair a sewer line without digging it up?
Sewer lines can be repaired without digging up the whole system if the damage is small and localized. This is known as trenchless pipe repair, and offers a viable repair method without the need to dig up the pipe.
