Welcome to the debut edition of our Pro-Diagnostic Series. At Mercy Plumbing, we believe a well-informed homeowner is a happy one. This is Volume 1 of an ongoing collection of expert guides designed to help Katy and West Houston residents troubleshoot common plumbing headaches before they become expensive disasters.
In this volume, we’re tackling the “ghosts in the machine”—those strange gurgles, smells, and unexplained spikes in your water bill that keep you up at night.
1. Why does my sink gurgle when the toilet flushes?
The Short Answer: A gurgling sink usually indicates a blocked or restricted plumbing vent pipe or a partial clog in the main drain line. This creates a vacuum that pulls air through your sink’s P-trap.
- The Technical Detail: Your plumbing system needs air to move water. If the vent (usually on your roof) is clogged by debris or a bird’s nest, the system “gasps” for air through the nearest drain.
- The Fix: Check your roof vents for obstructions or call a professional to snake the vent line and inspect for deeper main line clogs.
2. Why is my water bill suddenly so high?
The Short Answer: A sudden spike in your water bill is most often caused by a silent toilet leak (a faulty flapper) or an underground slab leak common in Houston-area homes.
- The Diagnostic Test: Put a few drops of food coloring in your toilet tank. If the color appears in the bowl after 15 minutes without flushing, you have a leak. If the toilet is fine, check your water meter; if it’s spinning while no water is running, you likely have a concealed pipe leak.
- The Fix: Replace the toilet flapper or contact Mercy Plumbing for electronic leak detection.
3. Why does my hot water smell like rotten eggs?
The Short Answer: This odor is typically caused by sulfur-bacteria reacting with the sacrificial anode rod inside your water heater, especially in West Houston homes with high mineral content.
- The Technical Detail: When the magnesium anode rod corrodes, it can produce hydrogen sulfide gas. This is more common in systems that have been sitting idle or in areas with specific water chemistry.
- The Fix: A professional can replace your standard magnesium rod with a powered anode rod or an aluminum/zinc alloy rod to neutralize the smell.
4. Why is my water pressure low in only one room?
The Short Answer: If low pressure is isolated to one faucet, the issue is likely a clogged aerator or a failing cartridge within that specific fixture.
- The Diagnostic Test: Unscrew the aerator (the mesh screen) from the tip of the faucet. If the pressure returns with the screen removed, simply clean or replace the aerator.
- The Fix: If cleaning the aerator doesn’t work, the internal cartridge may be blocked by sediment or mineral scale.
5. Is a "running" toilet an emergency?
The Short Answer: While not a “flood” emergency, a running toilet is a financial emergency, as it can waste up to 200 gallons of water per day.
- The Quick Check: Lift the tank lid and pull up on the float arm. If the water stops, your float needs adjustment. If it keeps running, the flush valve or flapper is failing.
- The Fix: Most internal tank components can be rebuilt in under an hour by a licensed plumber to restore efficiency.