An unexplained jump in your water bill nearly always means water is escaping somewhere continuously. The fastest way to confirm it is a meter test: shut off every fixture and appliance that uses water, then watch the meter. If it still moves, you have a leak, and the most common culprits are a running toilet, an irrigation line, or a slab leak.
Do the Meter Test First
Before calling anyone, spend five minutes confirming whether water is actually escaping. Turn off every faucet, shower, dishwasher, washing machine, and ice maker in the house. Do not flush anything. Then find your water meter, usually in a box near the street, and look at the low-flow indicator, which is often a small triangle or dial that spins with even a trickle of flow.
If that indicator is moving with everything off, water is leaving the system somewhere. If it is completely still, wait fifteen minutes and check the reading again to catch a very slow leak. A meter that has not moved at all over that period points away from a leak and toward a billing error, a rate change, or usage you have not accounted for, like a guest, a new appliance, or a longer irrigation schedule.
The Most Common Causes, Ranked
A running toilet is the leading cause and the cheapest to fix. A flapper that no longer seals lets water trickle continuously into the bowl, and a toilet that runs silently can waste thousands of gallons a month without ever making an obvious sound. Put a few drops of food coloring in the tank, wait twenty minutes without flushing, and check the bowl. Color in the bowl means the flapper is leaking.
Irrigation is the second most common, and it is easy to miss because it is outdoors. A cracked lateral line, a broken sprinkler head, or a valve that does not fully close can run into soil where nothing ever looks wet. If your meter stops moving when you close the irrigation shutoff, that is your answer.
A slab leak is the expensive possibility. Most Riverside County homes built since the 1970s sit on concrete slabs with copper supply lines underneath, and hard water gradually causes pinhole corrosion in that copper. A slab leak runs twenty-four hours a day into the soil beneath your foundation, which is exactly why the bill climbs while nothing visible happens indoors.
Why This Matters More Than the Bill
The money on the bill is usually the smallest part of the problem. Water escaping under a slab erodes the soil supporting your foundation, which leads to settling and cracking. Water inside a wall cavity can establish mold within a couple of days of sustained moisture. Both cost far more to resolve than the leak repair itself.
That is why an unexplained bill increase is worth treating as urgent even when nothing is visibly wrong. The bill is often the earliest signal you will get, arriving weeks before a warm floor spot, a damp baseboard, or a crack in the tile.
What You Can Check Yourself in Ten Minutes
- Run the meter test with every fixture and appliance off
- Food-coloring test every toilet tank in the house
- Close the irrigation shutoff and see whether the meter stops
- Walk the yard looking for a patch that is greener, softer, or soggy
- Feel the floors barefoot for a warm spot, which points to a hot water slab leak
- Listen in a quiet house for running water with everything off
- Check under every sink and around the water heater base for moisture
When to Call a Plumber
- The meter keeps moving with everything shut off and you cannot find the source
- You hear running water inside a wall or under the floor
- There is a warm spot on a tile or concrete floor
- A patch of yard is soggy with no irrigation running
- Flooring, baseboards, or drywall are damp, discolored, or cracking
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