8 Signs of a Hidden Water Leak in Your Greeley Home

Most leaks do not announce themselves. They start small, hide in walls or under concrete, and show up as odd little changes. You notice a higher bill, a musty smell, or a sound at night. This guide lists eight signs of a hidden water leak. It explains each one and tells you what to check first in a Greeley home.

One sign alone may have a simple cause. Two or three together point to a real leak.

1. Your water meter moves when nothing runs

This is the strongest sign. Your meter counts every gallon that enters your property. If it moves while every tap, appliance, and sprinkler is off, water is leaving your pipes.

Check the low-flow dial for 15 minutes. If it spins, you have a leak. Follow our water meter leak test for the steps. The test also tells you whether the leak sits inside the house or outside.

2. Your water bill climbs for no reason

A bill that rises with no change in your habits is a classic clue. Compare the last six months. A sudden step up suggests a new leak. A slow climb suggests a growing one.

In Greeley, single-family homes pay by a water budget with tiers. Water above the budget costs more per 1,000 gallons. A leak can therefore raise your bill faster than the extra water alone would suggest. Read how Greeley water budgets work for the details. If your bill already jumped, see our high water bill guide.

3. You hear water when nothing is on

Stand in a quiet house at night. Listen near the water heater, the meter, and the walls of your bathrooms. A hiss, a trickle, or a faint hum can mean water is escaping under pressure.

Some noise is normal. A water heater clicks as it heats. An ice maker fills now and then. A steady hiss that never stops is different. Note where it sounds loudest and tell us. That helps us start in the right place.

4. Damp spots, stains, or peeling paint

Water leaves marks. Look for:

• Brown or yellow rings on ceilings.
• Bubbling or peeling paint on walls.
• Soft drywall that gives under your finger.
• Dark spots on baseboards.
• Wet or stained cabinet floors under sinks.

Stains move. Water can travel along a pipe or a beam before it drips. The stain may sit far from the source. A hidden leak detection visit traces the water back to its start. See our page on hidden leak detection.

5. A musty smell or visible mold

Damp materials trap odor. If a room smells musty with no clear cause, moisture may sit behind a wall or under a floor. Mold needs water to grow, so black or green spots mean a source of water nearby.

Do not just clean the mold. Find the water first. If you only clean, the mold returns. Detection finds the source. A restoration company can then dry and clean the area.

6. Warm spots, cracks, or buckled floors

Floors can warn you about a slab leak or a leak under the floor.

• A warm patch on the floor. A leaking hot water line can heat concrete above it.
• Cupped or buckled wood. Boards swell when moisture reaches them from below.
• Loose or lifting tile. Water weakens the bond under tiles.
• New cracks in walls or floors. Water can wash out soil and let a slab settle.

Many Front Range soils swell and shrink. The Colorado Geological Survey documents swelling soils along the Front Range. A leak can add to that movement. See our page on slab leak detection for more.

7. Low water pressure

If water pressure drops in every tap, a leak may be taking water before it reaches your fixtures. Low pressure in only one fixture usually means a clogged aerator or a bad valve. Low pressure everywhere points to the main line or a large leak.

Check other causes first. A partly closed main valve, a failing pressure regulator, or a municipal repair can also drop pressure. If the meter moves with everything off, a leak is likely.

8. Wet or unusually green patches in the yard

Underground leaks surface in the yard. Look for:

• A soggy patch of lawn on a dry week.
• A strip of grass that looks greener than the rest.
• Soft or sunken ground.
• Water pooling near the meter box or a valve box.
• Mud near the foundation.

A yard leak could come from the service line, an irrigation line, or a hose spigot. Our pages on water line leak detection and irrigation leak detection explain how we tell them apart.

What to check first

Run through this short list before you call:

1. Run the meter test. It takes 15 minutes.
2. Test every toilet. Add food coloring to each tank. Color in the bowl after 5 to 10 minutes means a leak. The EPA lists this test on its Fix a Leak Week page.
3. Look under every sink. Check supply lines, traps, and the cabinet floor.
4. Check behind appliances. Look at the washer hoses, the dishwasher line, and the ice maker line.
5. Inspect the water heater. Look for puddles and rust.
6. Walk the yard. Look for wet patches and soft ground.
7. Close the irrigation shutoff and test again. If the meter stops, the leak sits in the sprinkler system.

If you find an easy cause, fix it. If the meter still moves, call a leak detection company.

Why small leaks matter

The EPA says household leaks can waste nearly 10,000 gallons of water a year. They can add up to 10 percent to a water bill. Serious leaks waste far more. Leaks also damage drywall, flooring, framing, and slabs. They invite mold and pests.

A small leak is the cheapest leak to fix. Check your meter once a month.

When to call a leak detection company

Call when:

• Your meter moves and you cannot find the cause.
• You see stains and cannot trace the source.
• A plumber could not find the leak. See our guide on what to do when a plumber cannot find the leak.
• You need written proof for insurance.
• Your bill jumped and the meter test shows a leak.

We find the leak, mark it, and write a report. Our leak detection report page explains what you receive.

When to shut off the water

Shut off the main valve if:

• Water is flooding a room.
• A pipe has burst.
• You cannot reach a fixture shutoff.
• Water is near electrical outlets or panels.

Know where your main valve sits before an emergency. Test it once a year. If water touches electrical equipment, stay away and call an electrician.

Common questions

Know the signs, then act

The signs of a hidden water leak are easy to miss. A moving meter, a rising bill, and a damp spot say more than you think. If you see two or more, call Leak Detector Greeley. We find the leak, mark the spot, and give you a clear report.