5 Signs You Have a Water Line Leak (And What to Do Next)

5 Signs You Have a Water Line Leak (And What to Do Next)

A water line leak is one of those problems that’s almost always cheaper to catch early than to ignore. The line that runs from your water meter to your house is under constant pressure, buried underground, and out of sight — which means a small crack can leak for weeks or months before anyone notices. By the time it’s obvious, you’re often dealing with a damaged foundation, a sky-high water bill, or both.

Here’s the short version: if your water bill jumped without a reason, you’ve got a wet patch in the yard that won’t dry, your pressure has dropped, or you can hear water running when nothing is on — you probably have a water line leak. The meter test at the bottom of this post takes about 15 minutes and will confirm it.

We’ve been doing water line repair across Canton, Cherokee County, and North Georgia for over 25 years — a lot of the homes in this area have aging supply lines, and we see leaks every week. The five signs below are exactly what we tell homeowners to watch for. If any of them sound familiar, give us a call at (678) 658-3170 and we can get out there fast.

What Is a Water Line Leak, Exactly?

Your home’s main water line is the pipe that brings clean water from the city main (or your well) to the inside of your house. In most Canton-area homes, it runs underground from the water meter at the property line — across your yard, under any landscaping or pavement in the way — and into the house, usually through a basement, crawl space, or slab.

A leak in this line is different from a leak under a sink or behind a wall. It’s underground, it’s pressurized, and you can’t see it. That’s why it has to be diagnosed by symptoms first, then confirmed with leak detection equipment before we know exactly where to dig.

The most common reasons water lines fail in North Georgia: age (galvanized lines from older homes corrode through, polybutylene fails earlier than expected), tree root intrusion, ground shifting after heavy rain or drought, and freeze damage from cold snaps.

Sign 1: Your Water Bill Suddenly Jumped

This is usually the first clue. Your bill is steady for years, then one month it’s 30%, 50%, sometimes 200% higher — and nothing changed in your household. No new tenants, no extra laundry, no full bathtubs every night. That’s water disappearing somewhere it shouldn’t be.

Pull up your last 12 months of bills (most water companies show this online) and look for the spike. A leak the size of a pinhole can waste 5–10 gallons an hour — that’s 3,500–7,000 gallons over a single month. A bigger leak can easily double or triple a normal bill.

One important caveat: water bills in Cherokee County also rise during summer if you’re irrigating, filling a pool, or running sprinklers. Compare year-over-year (this June vs. last June), not just month-over-month, to rule that out.

Sign 2: A Wet Spot, Soggy Patch, or Sinkhole in the Yard

When a water line leaks underground, the water has to go somewhere. Often, it surfaces — just not always close to the leak itself. You’ll see one of these:

• A wet spot in the lawn that won’t dry, even days after rain stops.

• A patch of grass that’s noticeably greener and thicker than the surrounding lawn (the leak is fertilizing it).

• Soft, spongy ground when you walk over a specific area.

• A small depression, sinkhole, or settling along the path between your meter and your house.

• Water bubbling up at the curb or in the street near your meter.

The leak isn’t always directly under the wet spot — underground water follows the path of least resistance, so it can travel along the pipe trench before surfacing. But the wet spot tells us where to start looking.

Sign 3: Low Water Pressure Throughout the House

A water line leak loses pressure between the meter and your house. The bigger the leak, the bigger the pressure drop. If you’ve noticed showers feel weaker, faucets take longer to fill a glass, or two fixtures running at once now feels like a struggle when it didn’t before — the supply line might be the cause.

A few quick checks to rule out other causes:

• If the pressure drop is in just one fixture, it’s usually a clogged aerator or shutoff valve at that fixture — not the main line.

• If pressure dropped throughout the whole house at the same time, that points to the main line, the pressure regulator, or the city supply.

• If pressure is fine in the morning but bad in the evening, that’s usually a city-side issue, not your line.

Whole-house pressure drop with no obvious explanation is a real warning sign — especially if it shows up alongside any of the other signs in this list.

Sign 4: The Sound of Running Water When Nothing Is On

Stand somewhere quiet in your house — ideally a hallway with no appliances running, late at night when traffic noise is low. If you can hear a faint hissing, trickling, or running-water sound coming from somewhere in the walls, the floor, or near your main shutoff, that’s pressurized water moving through a pipe when it shouldn’t be.

This sign is sneakier than the others because the sound is often subtle. People hear it for weeks and assume it’s the fridge, the HVAC, or a neighbor’s pump. If the sound is consistent and you’ve confirmed nothing in the house is actually using water (no toilet running, no ice maker filling, no humidifier), it’s worth investigating.

Sign 5: Discolored Water or Visible Sediment

A failing water line can let dirt and silt seep in through cracks, especially if the leak is near the line’s entry point or if soil is collapsing around the pipe. You’ll see:

• Brownish or rust-colored water, especially when you first turn on a faucet after the line’s been sitting.

• Visible sediment or grit in the bottom of a glass.

• Cloudy or off-color water that doesn’t clear up after running for a minute.

Important: not every dirty-water episode means a line leak. The city does flushing on the mains a few times a year, and your hot water heater can also throw rust if its anode rod is failing. But if the discoloration is on cold water only, it’s persistent, and other signs are present — the supply line is suspect.

How to Confirm You Have a Leak (The Meter Test)

Before you call a plumber, you can confirm a suspected leak yourself in about 15 minutes. Here’s how:

• Step 1: Turn off every water-using appliance and fixture in the house. Toilets, ice makers, washing machine, dishwasher, irrigation — all off.

• Step 2: Find your water meter (usually at the curb or property line, in a covered ground box).

• Step 3: Look at the meter. Most meters have a small triangular or star-shaped “leak indicator” dial that spins even at very low flow rates. Watch it for 60 seconds.

• Step 4: If the leak indicator is moving with everything off, water is leaving the meter — you have a leak somewhere between the meter and your fixtures.

• Step 5: To narrow it down, shut off your home’s main shutoff valve (where the line enters the house). Wait 5 minutes. Check the meter again. If the dial stopped, the leak is between the meter and the house — your underground water line. If the dial is still moving, the leak is between the meter and the shutoff (less common) or your meter itself is faulty.

Either way, once you’ve confirmed a leak with the meter test, the next call should be to a licensed plumber who can do underground leak detection and pinpoint the exact location before any digging starts.

What to Do Right Now If You Suspect a Leak

Don’t panic, but don’t wait either. Underground leaks rarely fix themselves, and they tend to get worse over time as the leak erodes more soil around the pipe. Steps in order:

• Run the meter test above to confirm.

• Document what you’re seeing — photos of any wet spots, copies of the spiked water bill, notes on when the pressure changed.

• If the leak is severe (visible bubbling at the curb, an actively expanding wet area, or pressure has dropped to nothing), shut off the main valve and call us right away. We treat active line leaks as emergencies and respond accordingly — see our emergency plumbing service for details.

• For non-urgent leaks, schedule a leak detection visit. We use acoustic equipment and pressure testing to find the exact failure point so we only have to dig in one spot, not trench the whole yard.

A few things not to do: don’t start digging on your own based on where you think the leak is (you can damage the line worse, and underground utilities like gas and electric run alongside water lines in a lot of yards). Don’t patch a visible leak with tape or sealant and call it done — if the line failed once, it will fail again, usually somewhere worse.

Why Water Line Leaks Are Worse Than They Look

A pinhole leak might sound minor, but here’s what we see when homeowners let one go too long:

• Water bills compound. A small leak that costs $30/month extra runs $360/year — and they almost always grow.

• Eroded soil weakens foundations. If the leak is near the house, the constant moisture and soil movement can undermine the foundation slab.

• Tree roots accelerate. A wet, pressurized leak attracts roots to the pipe, which then make the leak bigger.

• Sinkholes appear. The leak creates voids underground that eventually collapse — sometimes under driveways, walkways, or right next to the house.

• Repair scope grows. A spot repair on a fresh leak is straightforward. A line that’s been leaking for a year often needs a full replacement plus landscaping repair.

Most water line repairs in our service area run $800–$2,500 for a spot repair, and $3,500–$8,000 for a full line replacement, depending on length, depth, and what the line runs under. Catching it early keeps you in the spot-repair range.

Frequently Asked Questions

How long can a water line leak before it becomes a serious problem?

It depends on the size of the leak and where it is. A pinhole leak in the middle of a yard might go six months to a year before causing visible damage. A leak near a foundation, driveway, or large tree can cause structural or sinkhole damage in weeks. As a rule: if you’ve confirmed a leak with the meter test, get it diagnosed within a week or two — not months.

Does homeowner’s insurance cover water line repair?

Sometimes — it depends on your policy and what caused the leak. Most standard policies cover sudden, accidental damage but exclude gradual leaks and normal wear. Many insurers also exclude the underground water line itself unless you’ve added a service line endorsement to your policy. Worth a phone call to your insurance agent before any repair work starts.

Do I need to dig up my whole yard to fix a water line leak?

No. With proper leak detection, we can usually pinpoint the leak within a few feet and dig just that spot for a repair. For full line replacements, trenchless methods (pipe bursting and directional drilling) often let us replace the whole line with only two small access holes — no full-yard trench. We’ll tell you which method makes sense for your situation when we come out.

How quickly can you respond to a water line leak in Canton?

For active leaks (visibly running water, no pressure to the house), we treat it as an emergency and target same-day or 60-minute response anywhere in Cherokee County. For confirmed-but-not-urgent leaks, we usually schedule within 1–2 days. Call (678) 658-3170 and we’ll tell you what we can do.

Should I shut off my main water valve if I think I have a leak?

Only if the leak is bad. For a small confirmed leak, leaving the water on is usually fine until we arrive — you’ll lose some water but you’ll still have service to the house. Shut off the main if you’re seeing active surface water, sudden total pressure loss, or any signs the leak is near the foundation. When in doubt, call us first and we’ll tell you whether to shut it off.

Caught a Leak Early? Don’t Wait

Water line leaks are one of those problems where the cost of acting now versus acting in three months can be a factor of 10. A spot repair caught early is a few hours of work and a relatively small bill. A failed line that took out a section of driveway and undermined a foundation is a different conversation entirely.

Precision Plumbing & Septic does water line repair and replacement across Canton, Woodstock, Holly Springs, Ball Ground, and the rest of Cherokee County. We use acoustic leak detection to find the exact failure point before we dig, so we only disturb what we have to. If you’re not sure whether what you’re seeing is a leak or something else, our emergency plumbing checklist covers what to do in the moment. Otherwise: call (678) 658-3170 or book online — we’re available 24/7.