An unexplained jump in your water bill is one of the most common reasons Lakewood homeowners call us, and it's a genuinely useful signal, water bills don't spike randomly. Something changed, and it's almost always one of a handful of specific causes. Here's how to think through it before assuming the worst.
Start With The Simplest, Cheapest Explanation
A running toilet is by far the most common cause of an unexplained water bill increase, and it's also the cheapest and easiest to check. Put a few drops of food coloring in the tank and wait ten minutes without flushing. If color appears in the bowl, the toilet is leaking from the tank into the bowl, usually a worn flapper, an inexpensive repair.
The Meter Test
If the toilet checks out fine, the next step is checking your water meter directly. Make sure no water is being used anywhere in or outside the house, no dishwasher, no irrigation, nothing, and note the meter reading. Wait an hour without using any water, then check again. If the reading changed, water is flowing somewhere you're not accounting for.
Where To Look Next
Irrigation System
A cracked line or a valve that isn't fully closing can waste a significant amount of water without any obvious visible sign.
Water Heater
A slow leak from the tank itself or its connections can run for a while before becoming visibly obvious.
Under-Slab Or In-Wall Supply Lines
The least visible cause, and the reason a bill spike with no other obvious explanation often points to a slab leak.
Outdoor Spigots And Hose Bibs
Worth checking directly, since a slow drip here is easy to overlook if it's not in a frequently used area.
When It's Time To Call For Leak Detection
If the meter test confirms water is moving with everything off, and you've ruled out the toilet and any visible outdoor sources, that's the point where electronic leak detection makes sense. Guessing further on your own from this point usually just delays finding the actual source, since a hidden leak in a wall or under a slab isn't something you can locate without the right equipment.
How Much Does This Actually Cost You If Ignored
The exact cost depends on the leak's size and how long it runs, but the pattern is consistent: a leak that goes unaddressed doesn't get smaller on its own, and the water bill impact compounds every billing cycle it continues. Beyond the direct cost of wasted water, an undiagnosed leak also carries the risk of the secondary damage it can eventually cause to flooring, drywall, or a foundation.
A Quick Gut Check
If your bill increase lines up with a specific known change, filling a pool, more houseguests, a new appliance, that's probably your answer, and no further investigation is needed. It's the unexplained increases, ones that don't match any change in your actual water use, that are worth taking seriously.
Keep The Process In Order
Working through this in order, toilet first, then the meter test, then visible outdoor sources, before calling for professional detection saves you money and gets to the actual answer faster than jumping straight to assuming the worst-case scenario.
Keeping A Baseline For Comparison
It helps to know roughly what your normal monthly usage looks like during an ordinary billing cycle, so a genuine spike is easier to recognize the next time it happens. Most water utilities make past usage history available online, and a quick look at that history is often the fastest way to confirm whether a given month is truly unusual.
Have A Question About Your Own Home?
Skip the search, describe the problem and we'll tell you what's actually going on.
Common Questions
There's no universal number, since usage varies by household, but an increase with no corresponding change in your actual water habits is worth investigating regardless of the dollar amount.
Yes, some leaks are pressure or temperature dependent and don't run constantly, which is part of why the meter test, done with everything genuinely off, is more reliable than casual observation.
It's possible, though less common than an actual leak. If the meter test at your home shows no movement with everything off, it's reasonable to raise the possibility of a billing error with your utility.