Ask House Spouse · Plumbing · Leaks & Water Damage
How do I find a hidden water leak in my house?
Short answer
Turn off every fixture and appliance, then watch the small red "leak indicator" dial on your water meter for 10–15 minutes. If it moves, you have flow somewhere with everything off — that's a leak. Isolate by shutting off the main to the house and the water heater; the meter tells you if it's on the incoming side or inside.
The 10-minute meter test
Every water meter has a tiny triangular or star-shaped dial that spins on any flow. Shut off every tap, fill valve, appliance, and the ice maker. If the dial moves at all over 10 minutes, you have a leak. This test alone finds ~80% of hidden leaks we investigate.
Common hiding spots
Toilet flappers (a silent flapper leak wastes ~200 gallons/day), the refrigerator ice-maker line, the outdoor hose bib in freeze season, and a slow drip inside a cabinet feeding a supply line. Check every angle stop under every sink for green corrosion — that's a sign of past weeping.
When to escalate
Warm floor in one spot (slab leak), a stain on the ceiling downstairs, or a spike in your water bill with no meter movement (backyard irrigation leak) all justify calling in help. House Spouse runs a moisture-mapping investigation ($225 flat) that pinpoints location before anyone opens a wall.
What we see on Home Health Assessments
About 62% of PNW homes we assess have at least one downspout dumping within 3 feet of the foundation.
Caught early on assessment: $180–$650 · Left until failure: $3,500–$14,000
Based on real experience across Snohomish and King County, plumbing issues like this are among the ones homeowners most often miss until they become expensive. Our Home Health Assessment catches them early — while they're still a maintenance item, not a repair.
How the Home Health Assessment worksServices we'd bring to this job
Related questions
Plumbing · Leaks & Water Damage
Why is there a brown stain on the ceiling under my bathroom?
A ring-shaped stain directly under a toilet is usually a failed wax ring — the seal between the toilet and the flange. A stain under the tub is usually the tub drain gasket or the overflow gasket. A stain along the wall is often a wall pipe. All three are fixable in half a day; ignoring them turns a $250 fix into a $4,000 subfloor replacement.
Plumbing · Faucets, Toilets & Fixtures
How do I stop a toilet that keeps running?
A toilet that keeps refilling every few minutes has a leaky flapper 90% of the time. Drop food coloring in the tank, wait 15 minutes, and check the bowl — if the color shows up in the bowl without flushing, replace the flapper. It's a $8 part and a 10-minute fix.
Safety & Prevention · Water Leak Prevention
Should I install a whole-house automatic water shutoff?
For any home worth over $500K, yes — a Flo by Moen, Phyn Plus, or LeakSmart device installed on the main pays for itself the first time it stops a burst pipe or a failed dishwasher line. Many home insurance carriers offer 5–10% policy discounts for these devices. Install runs $700–$1,400 including a licensed plumber.