Upstairs laundry rooms and baths
Many Center Grove homes put the laundry room and two or more bathrooms on the second floor. When any of them leaks, the first sign is usually a stain on the ceiling below, and the ceiling can be a room or two away from the source because water runs along joists before it drips.
Washer boxes (the recessed box with the hot and cold valves and the drain), the washer’s hoses and the drain standpipe are common culprits. So are toilet wax rings, tub and shower drains, and shower pans.
How we find it
- Meter testA moving meter with everything off means a pressurized supply leak; a still meter points to a drain, shower or appliance.
- Moisture mapMoisture meters on the ceiling, walls and floors above show where the water is concentrated.
- Thermal imagingShows the shape of the wet area and traces hot-water lines.
- Fixture testsRun each upstairs fixture, the washer or the shower one at a time, or flood-test the shower pan.
- MarkThe source is marked with photos and readings.
What the stain is telling you
| Clue | Likely source |
|---|---|
| Ceiling stain after laundry days | Washer drain, standpipe or washer box valves |
| Stain after showers only | Shower pan, valve, drain or grout |
| Stain near the kitchen, growing slowly | Refrigerator or ice maker line, or dishwasher connection |
| Wet spot that grows with no water in use | Pressurized supply line or PEX fitting |
| Damp drywall low on an outside wall | Hose bib line, often after a freeze |
While you wait
- If the ceiling sags, put a bucket under it and puncture the lowest point to drain it in one place.
- Stop using the fixture you suspect, and turn off the washer valves.
- If the meter is moving, close the main shutoff when you’re not using water.
- Photograph everything for insurance.
Once marked, the repair is one small opening. See leaking pipe repair in Center Grove. A smart leak sensor under the washer and fridge can catch the next one early; see smart water leak detectors.
Hidden Water Leak Detection: questions from Center Grove homeowners
Why is my first-floor ceiling leaking under the laundry room?
Common causes are the washer drain or standpipe, the hoses or valves in the washer box, or an overflowing drain. A meter test and running the washer while watching the ceiling usually narrow it down.
Do PEX pipes leak?
The pipe itself rarely does. Leaks usually come from crimp rings, fittings or damage during construction, often behind a shower valve or at the manifold.
Can you find a leak without cutting into the ceiling?
Yes. Moisture mapping, thermal imaging and fixture tests locate the source, and only the marked spot is opened for the repair.
Is a ceiling stain always a plumbing leak?
No. Roof leaks, condensation from HVAC lines and ice dams can stain ceilings too. Testing the plumbing first tells you whether to call a plumber or a roofer.
Guides that go deeper
Sources: Indiana American Water; Town of Bargersville Water Utility; Indiana 811; Indiana Administrative Code, Title 327. Updated October 1, 2026.