Leak Detection
Locate a hidden leak inside a wall, under a floor or along a buried line before it stains drywall or inflates the bill.
Homeowner guide
Finding a Water Leak in Your Lafayette, CO House
Most leaks announce themselves with a stain or a drip. The hard ones hide in a wall or under the ground. A methodical check can find many of them before you pay for a detection visit.
By the Lafayette Plumbers team ·
Check the meter first
The meter confirms whether a leak exists. Close every tap and appliance and watch the low-flow dial. Movement means water is escaping. Now close the main and read again. A dial that halts places the leak indoors.
A dial still moving after the main is closed implicates the underground pipe on the way in from the street. That narrows the search to the yard, and a locator is the right tool.
Toilets: the silent culprit
Add dye to the tank and do not flush for fifteen minutes. Tinted water in the bowl exposes a leaking flapper.
Listen for hissing after a flush, since a fill valve that never shuts off causes it. Press the tank lid down and check the water level against the overflow tube. A level that sits too high will drain constantly. See toilet repair for the common fixes.
Sinks, tubs and appliances
Open each cabinet and feel the supply lines, shutoff valves and traps with a dry paper towel. Moisture on the towel means a leak. Pull the washing machine out and check both hoses, and look behind the dishwasher and refrigerator ice-maker line.
In bathrooms, check the base of the tub, the caulk around the shower and the floor beside the toilet. A soft spot underfoot suggests a longer-term leak.
Quick checks by location
Each check takes a few minutes.
| Place | What to do | What a leak looks like |
|---|---|---|
| Toilet | Dye tablet in the tank | Color reaches the bowl |
| Under sinks | Dry paper towel on pipes and valves | Damp towel |
| Appliance hoses | Pull out and inspect | Bulging or wet hoses |
| Meter | Read with everything off | Dial that moves |
Walls, ceilings and floors
Stains that grow, paint that bubbles and drywall that feels soft point to water behind the surface. A musty smell without a visible source is another sign. Look below bathrooms and kitchens for ceiling stains.
A moisture meter or a thermal camera, used by many plumbers, finds wet areas without cutting. A hissing sound in a quiet wall can mean a pressurized leak.
Underground and slab leaks
A damp patch in the lawn, a spot that stays green in a dry spell or a warm patch on a concrete floor can all signal a buried leak. Loss of pressure at every tap is another clue.
These leaks are hard to find by eye. Contractors who locate and mend these leaks are described under slab leak detection and water line repair.
When to call
Call a plumber when the meter confirms a leak and you cannot locate it, when a wall is wet, or when water is spreading. Close the main valve first if damage is active.
While you wait, photograph the meter and any damage, move belongings and ask the plumber about a detection method that limits cutting.
Using your senses first
Listen at night for hissing near walls, and feel floors for warm spots that could signal a hot line below a slab. Smell for musty air in closets and cabinets, since slow leaks often show up as odor before stains.
Check ceilings and the base of walls for color changes, bubbling paint or soft drywall. Press gently with a finger. A soft spot suggests water has been present for a while.
Outdoor and underground clues
Wet patches in the yard, a lawn zone greener than the rest and the sound of water near the meter can all mark a buried line. Check hose bibs and irrigation valve boxes for standing water.
A meter that runs after you close the main inside means the leak lies between the meter and that shutoff. That stretch is the homeowner's responsibility in many places, so confirm with your provider.
Writing it down for the plumber
Record meter readings with times, the rooms with stains and the sounds you hear. Photos with dates help a technician see how a problem has changed.
Share what you have already tried, such as closing valves or replacing parts. Clear notes shorten the diagnosis.
Safe handling of a leak you find
Close the nearest stop valve, or the main if the source is unclear. Move electronics and rugs away, and soak up standing water so it cannot spread under baseboards.
Take photos, run a fan and keep the area ventilated. Then arrange the repair, since a patched leak that keeps dripping will damage framing over time.
A quick weekend checklist
Look under every sink, behind each toilet and around the water heater. Check the washer hoses and the refrigerator line, and glance at the ceiling below any upstairs bathroom.
Finish with a meter test. Ten minutes of careful looking each season catches most small leaks before they cost real money.
Using a moisture meter and thermal camera
Professionals read walls with a pin or pad moisture meter, which shows relative dampness in drywall, wood and plaster. A thermal camera picks up temperature differences, such as a cold stripe where a pipe leaks into a wall, but it does not see water directly.
Neither tool replaces judgment. A technician combines readings with pressure tests and the meter test, and they confirm the source before any opening is cut, which keeps patching to a minimum.
Leaks you hear but cannot see
A faint hiss with all fixtures off can come from a pinhole in a pressurized line, while a ticking in the wall may be thermal movement. Press the end of a screwdriver to the wall with your ear on the handle to follow a hiss along a pipe.
Mark the loudest spot lightly and tell the technician. It narrows where the opening needs to be.
Common questions
Answers on leak-finding
Often yes. The meter test, a dye tablet and a hand along the pipes find many leaks.
With listening devices, moisture meters and thermal imaging, before any cutting.
No. A leak in a wall cavity or under a slab may show no stain for a long time.
Call for detection. The leak may be under the floor or in the yard.
Related services
Slab Leak Detection & Repair
Track down a pipe leak under a concrete slab or basement floor and choose between a patch and a reroute.
Water Damage Restoration
Pump out water, dry the building and repair it after a leak or flood.
More plumbing guides
Why the water bill jumped
A bill that suddenly climbs usually has a cause you can find. Check these likely suspects in order.
Fixing a running toilet
A toilet that runs nonstop quietly burns through water and cash. Most causes are cheap parts you can swap.
Causes of low water pressure
Weak flow can come from one clogged aerator or a failing regulator. Work from the simplest cause to the biggest.
Speak with the phone desk
Found a leak, or think you have one?
Call the 24/7 line and describe what the meter and the damp spots are showing.
Call (720) 743-9476(720) 743-9476 · day and night