They are making a few great points about Detecting hidden plumbing leaks in general in this post just below.

The minute you find a leak, calling your plumber for repairs is the best service. Nevertheless, some tiny water leakages may not show up. If you can not find it with your naked eyes, below are some hacks that help.
Early detection of dripping water lines can mitigate a prospective catastrophe. Apart from saving you money, it will minimize the worry and disappointment.
Examine Water Intake
Analyze your water costs and also track your water consumption. As the one paying it, you should discover if there are any discrepancies. If you find sudden changes, despite your consumption coinciding, it suggests that you have leakages in your plumbing system. Remember, your water costs should fall under the very same range each month. An abrupt spike in your bill indicates a fast-moving leakage.
Meanwhile, a consistent boost on a monthly basis, despite having the same habits, shows you have a slow leak that's additionally slowly escalating. Call a plumber to completely examine your residential property, specifically if you really feel a cozy area on your floor with piping underneath.
Examine the circumstance and evaluate
Home owners need to make it a routine to check under the sink counters and even inside cabinets for any bad odor or mold and mildew development. These 2 red flags indicate a leakage so punctual attention is called for. Doing regular evaluations, also bi-annually, can save you from a significant issue.
Analyze the Water Meter
Every residence has a water meter. Inspecting it is a surefire manner in which assists you discover leakages. For beginners, turn off all the water resources. Make sure no one will certainly flush, utilize the faucet, shower, run the washing equipment or dishwasher. From there, most likely to the meter and also watch if it will certainly transform. Considering that no one is utilizing it, there should be no movements. If it moves, that suggests a fast-moving leakage. Furthermore, if you spot no changes, wait an hour or 2 and also examine back again. This suggests you might have a sluggish leak that can even be underground.
Asses Outside Lines
Don't forget to examine your outdoor water lines also. Test faucets by affixing a garden pipe. Should water permeate out of the link, you have a loose rubber gasket. Change this and ensure all links are tight. If you have actually obtained a lawn sprinkler, it will certainly assist get it skillfully examined and maintained yearly. One small leakage can waste tons of water as well as surge your water bill.
Do a Food Coloring Test
When it comes to water intake, 30% comes from bathrooms. If the color somehow infiltrates your dish throughout that time without flushing, there's a leak in between the storage tank as well as dish.
Inspect for discolorations as well as deteriorating as a lot of appliances and pipes have a life expectancy. If you presume leaking water lines in your plumbing system, don't wait for it to escalate.
The moment you discover a leakage, calling your plumber for repairs is the best service. Some little water leakages might not be noticeable. Checking it is a surefire way that helps you discover leaks. One little leakage can waste loads of water and spike your water costs.
If you believe dripping water lines in your plumbing system, don't wait for it to escalate.
Tips for Detecting Hidden Plumbing Leaks
Check for Signs of Water Damage
We recommend that you check the following places for evidence of water damage:
Near where you store your water heater
Around your sump pump
In areas where pipes are visible
Underneath cabinetry or a vanity beneath a sink
Where your outside hose bib isIf water damage is present, you may also notice mold and/or mildew or smell a foul or musky odor. You might also be able to hear the sound of water running where it shouldn’t be.
Perform a Water Meter Test
One of the easiest ways to determine whether you have a hidden leak on your property is to test your water meter. Turn off all appliances in that use water and make sure you don’t have any faucets running. Locate your water meter and record the reading on it. Continue to leave everything off for a minimum of two hours and then go back and see the meter reading. If it’s a noticeable difference, chances are you have a hidden plumbing leak.
Monitor Your Outside Usage
As the seasons change, you might use more water to keep your yard lush and green and your flowers blooming. However, it’s important to routinely ensure that your sprinkler or irrigation system is working properly and that any outside faucets are completely off. This way you’re not wasting any water.
Do the Toilet Food Coloring Test
Are you kept up at night because your toilet continues to run? If you’ve noticed your toilet randomly refills, especially when it’s not in use, it could mean you have a defective flapper tank and water will leak into the bowl. Fortunately, there’s an easy (and kind of fun!) way to test whether you’re dealing with this issue. Grab some food coloring and add a few drops into your toilet’s tank. Wait 15 minutes and then check to see whether the water in the bowl is colored. If it is, you have a leak within your toilet and the internal assembly will need to be repaired or replaced.
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