If your O'Fallon water bill has climbed without a clear reason, or your softener seems to regenerate more often than you expect, your water meter can help you sort out what is happening. This check needs only a flashlight and a few minutes, and it gives you a clear starting point before you call a plumber or your water provider.
Find and read your meter
In most O'Fallon homes, the main water meter sits in a box near the street or inside the house where the supply line enters, often in a basement, utility room, or crawl space. Look for a dial or digital display and a small leak indicator, often a triangle or sweep hand. Write down the current reading before you start, along with the date and time.
Run a no-use test
Turn off every faucet, shower, and appliance that uses water. Check that the washing machine, dishwasher, ice maker, and any irrigation timer are idle. Wait for a stretch of time with no use, such as one or two hours, then read the meter again. If the leak indicator keeps moving while nothing is running, water is passing through the meter somewhere on your side of it.
Account for your softener
A softener uses water when it regenerates, and that water goes to the drain. Look at the control head to see whether a regeneration cycle is scheduled or in progress. If the meter moved only during a regeneration window, that movement may be normal for your system. If it moved at other times, keep looking.
Check the most common sources
- Toilet tanks. A flapper that does not seal lets water trickle into the bowl, and the tank refills on its own. A few drops of food coloring in the tank, left alone for a while, can show whether color reaches the bowl without flushing.
- Fill valves and float arms. A valve that does not shut off completely keeps the tank filling.
- Outdoor hose bibs and irrigation zones. A worn washer or cracked line can run slowly without anyone noticing.
- The water heater. Look at the drain valve and the pressure relief valve for drips.
- The softener and its connections. Look for moisture at the brine line fittings, the drain line, and the bypass valve.
Look at the yard and the street
Walk the lawn and the area around the water service line for soft spots, unusually green patches, or wet ground that does not dry after several days without rain. Note any puddles near the meter box. Underground leaks often show up first as changes in the lawn rather than as water on the surface.
When to escalate
If the meter still moves after you have turned off every fixture and checked the common sources, the leak is likely in a buried line or somewhere inside a wall or slab. At that point, a licensed plumber with leak detection equipment is the practical next step. Share your meter log with them, since the dates and times help narrow down where to look. If your home is served by a private well instead of municipal supply, the same meter logic does not apply, and you should check the pump and pressure tank instead.
Keep a simple log
Record the date, time, meter reading, whether the house was in use, and whether the softener was regenerating. Two or three entries over a few weeks show patterns that a single reading cannot. Keep the log near the meter or on your phone so it stays with your house records.