What It Is
The water service line is the underground pipe that connects your home to the municipal water main in the street, or to a private well. It runs from the water meter or well casing to the point where it enters the foundation. This pipe carries pressurized water into the home continuously. In most municipalities, the homeowner is responsible for the line from the water meter (or curb stop) to the house - the utility owns the main itself.
What It Does
The service line delivers the home's entire water supply. Every fixture, appliance, and water-using device in the home draws from this single supply path. Its diameter determines the maximum flow rate available to the home - undersized lines cause pressure drops when multiple fixtures run simultaneously.
Where It Is Located
The service line is buried below the frost line - in Ohio, typically 4 to 5 feet deep to prevent freezing in winter. It runs from the water meter (usually near the property line or in a pit at the street) horizontally to the foundation wall, then enters the basement or crawlspace. The point where it comes through the foundation is usually where the main shutoff valve is located.
How It Works
Municipal systems maintain continuous pressure in the water main - typically 60 to 100 psi at the main. The service line taps into this pressure, with the meter measuring flow as water passes. A curb stop or corporation stop at the main serves as the utility's shutoff. The homeowner's main shutoff valve is typically just inside the foundation wall.
Service line materials have changed over decades. Homes built before the 1970s may have galvanized steel or lead service lines. Homes built through the 1980s often have copper. Most new construction uses HDPE (high-density polyethylene) plastic, which resists corrosion and root intrusion better than metal.
Common Problems or Signs of Failure
- Wet or unusually green patch of lawn between the house and street - may indicate a slow service line leak
- Reduced water pressure throughout the entire home simultaneously - partial blockage or partial break
- Water bill increase with no change in usage - service line losing water underground
- Discolored water when first turned on - corrosion inside galvanized or aging copper service line
- Soil settlement over the line's path - underground erosion from a long-running leak
Can a Homeowner Check It?
- Walk the path of the service line (straight from the meter to the house) and look for unusually soft, wet, or green ground
- Check the water meter: with all fixtures off inside, look at the meter's leak indicator dial - if it moves, water is flowing somewhere
- Note if the pressure drop affects all fixtures at once - that points to the service line, not individual fixture lines
- Ask the utility if they can provide the pipe material on record for your service line
When to Call a Plumber
Call a plumber if you see water surfacing in your yard along the service line path, if the water meter shows continuous flow with all fixtures closed, or if pressure has dropped significantly throughout the home. Service line leaks and repairs require excavation and are not DIY work. A plumber can also assess whether a failing galvanized or older service line should be replaced proactively before a more serious failure occurs.
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