Know Your System
Supply Lines and Drain Lines Are Two Different Systems
People say “water line” and “sewer line” in the same breath, but they’re opposite systems with opposite jobs — and confusing them leads to the wrong service call.
Water supply lines — this page — bring clean, pressurized water into the building: from the Virginia American Water main, through the meter, and along your private line. Here, trouble shows as leaks, fading pressure, discolored water, or a water bill that jumps for no reason.
Drain and sewer lines carry wastewater out by gravity — slow drains, gurgling, and backups. Seeing those instead? You need sewer line repair or drain cleaning — not this page.
The practical test: water coming out where it shouldn’t (a leak, a wet spot, a hissing pipe) means supply-line territory; water that won’t go away where it should (a drain that won’t empty) means drainage territory. Describing it that way when you call gets you to the right diagnosis faster.