To find a water leak inside a wall or ceiling, start with simple signs and, when needed, use professional leak detection to locate hidden moisture without opening large areas. Most interior leaks come from supply lines, fittings, or upstairs fixtures that slowly saturate drywall before stains appear. Pros confirm the source with acoustic listening, pressure testing, thermal imaging, and targeted dye-tests so repairs stay as small and cost‑effective as possible. In the Winter Park area, our licensed plumbers pair these tools with visible‑pipe checks and camera inspections when the path is unclear. If water is active or drywall is swelling, treat it as urgent; a slow drip can travel far from the source, so where you see the stain may not be where the pipe is leaking. Shut off water to the affected area and protect nearby electrical before anyone cuts into finishes.
- Look for new stains, bubbling paint, musty odor, or buckling trim.
- Listen for hissing behind walls when fixtures are off.
- Do a 15‑minute dye test in upstairs toilets to rule out silent leaks.
- Check the water meter for movement with all fixtures off.
Turn off the main valve if the ceiling bulges or water is near outlets or lights.
Updated: 2026-07-04
Need help in Winter Park, FL? Call (407) 768-4694 or book online. "Marshall was so thorough in fixing a leak under my sink he found a fire hazard and poorly done electrical and saved me a fortune by pointing it out and scheduling an electrician on the spot!" — Lauren N.