A buried water service almost never fails loudly. It fails underground and out of sight, quietly adding to the water bill until somebody notices. These are the signs we actually find behind failed water lines on real jobs around Seattle, the Eastside and Snohomish County — roughly in the order you are likely to meet them — and the one test that settles the question in five minutes.
1. The meter turns with everything shut off
This is the definitive sign, and you can check it yourself today. Shut off every fixture and appliance that uses water — taps, ice maker, irrigation, humidifier — then go watch the meter. If the low-flow indicator creeps or the dial moves at all, water is leaving the system somewhere. If you have also confirmed nothing inside is running, the somewhere is usually the buried service line between the meter and the house. That test is the first thing our technicians do on a suspected line failure, and it is the difference between "we think" and "we know."
2. Your water bill drifted up and nothing else changed
A service-line leak bills you before it shows itself. A few hundred gallons a day through a split in the line reads as a bill that climbed over two or three cycles with no new habits to explain it. If the bill has jumped and the meter test above moves, you can stop guessing: together, those two are close to conclusive.
3. Pressure dropped everywhere at once
One weak faucet is a fixture problem. Every fixture weak at the same time is a supply problem — either the line is leaking hard enough to bleed pressure, or (on old galvanized services) the pipe has narrowed from the inside until it cannot carry what the house asks for. Galvanized lines spend decades closing themselves off before they ever spring a leak; faded whole-house pressure is how they announce it.
4. A wet, soft or suspiciously green patch outside
Water finds the surface eventually. In summer it looks like one stripe of lawn that stays lush while the rest browns off; in winter it is a patch that never firms up, or standing water with no rain to blame. Follow the line's path — meter to house — and pay attention to anything soggy along it. On a Shoreline job last summer, the giveaway was the planting strip: the failed section was sitting in groundwater seepage when we opened it up — that repair is written up here.
5. The line has been patched before
A service line with a clamp on it is a line on borrowed time. On a Kirkland call in December, the "failure" was an old clamped splice from a previous repair letting go — the crew pulled the section out with the original clamps still stacked on it. A first repair on a sound line is legitimate; a second failure on the same run means the line itself is telling you it is done. That is the point where we quote the repair and the replacement side by side, and genuinely stand behind both numbers.
6. Dirty or rusty water after the utility worked nearby
When a main gets flushed or a valve slams, weak pipe shows it. Rusty water that clears is usually disturbed sediment; grit that keeps arriving, or water that stays discolored at one house while the neighbors run clear, points at a service line shedding from the inside — classic end-stage galvanized behavior.
7. Water in the crawlspace where the line comes in
The service line does not stop at the foundation — it enters the house, usually through the crawlspace, and the entry point is a classic failure spot. A damp vapor barrier near where the supply comes in, mineral crust on the pipe at the penetration, or a musty smell under the hall are all worth a flashlight trip before they are worth a panic. Around here the failure is as likely to be just inside the foundation as out in the yard, and the fix is very different — which is exactly why we diagnose before quoting.
8. The house is old enough that the line is the original
With water services, the material largely decides how the story ends. Pre-war and early postwar houses around Seattle came with galvanized steel services; plenty of 60s–80s houses got early plastic that has not aged much better. If your house has never had its service replaced and it predates the moon landing, the honest question is not whether the line will fail — it is whether you will replace it on your schedule or on the line's.
Our Recommendation
Run the meter test once a season — it costs five minutes and nothing else. Treat any two signs on this list together as a diagnosis worth confirming, and treat a second failure on an already-patched line as the replacement decision made for you. And if the line is original galvanized, plan its retirement like a roof: on purpose, in decent weather, at a price you compared — not at midnight with water in the crawlspace.
When we come out, the sequence is the same every time: prove where the water is going, locate the line, then quote the spot repair and the full replacement side by side so you can see both numbers. Where the meter test says "leak" but nothing on this list points at a spot, leak detection narrows it down before anyone digs — finding the failure is always cheaper than excavating for it. What each option costs, and what moves the price, is broken down in our water line replacement questions.
If Your Line Is on This List
Call 425-245-7552 for a free estimate, or request a callback — we will start with the meter, not the shovel.
More: main water line repair · trenchless water line replacement · leak detection · a water service spot repair in Shoreline