If your water bill climbed and nobody changed their habits, test the meter before you argue with anyone. Turn off every faucet and appliance that uses water, find the meter and watch the leak indicator or the small low-flow dial. If it moves while nothing is running, water is leaking somewhere past the meter.
The test takes about 15 minutes and costs nothing. It does not tell you where the leak is, but it tells you which side of the meter to look on, and that decides who you call next.
How to do the meter test
Pick a quiet time when no one is showering, washing clothes or running the dishwasher. The ice maker and any humidifier also count, so switch them off.
Shut off every use of water
Close all taps, stop the washer and dishwasher, and make sure no one flushes. Check that the water heater is not refilling after a recent use.
Find and open the meter cover
Most Blue Island meters sit in a basement or utility closet near where the service line enters the house. Wipe off the face and look for a small triangle or gear that spins with flow.
Watch the low-flow indicator
If the triangle or dial turns even slowly with everything off, water is moving through the meter. Write down the reading numbers.
Wait 15 to 30 minutes
Do not use water in the meantime. Check the numbers again. A change in the reading means a leak.
Close the main valve and watch again
Shut the valve just inside the house. If the meter stops, the leak is inside the house. If it keeps moving with the valve closed, the valve may not be sealing or the leak is before it.
If you cannot find the meter or the shutoff valve, call (773) 207-0518 and a plumber can locate them and run the test with you on the phone.
Common sources of a hidden leak
When the meter confirms a leak, start with the cheap and quiet culprits before you assume something is buried in a wall.
- A running toilet. Put a few drops of food coloring in the tank and wait 15 minutes without flushing. If color shows up in the bowl, the flapper is leaking.
- A dripping faucet or showerhead. One drip per second adds up over a billing period to a surprising amount.
- A leaking water heater or softener connection. Look for damp floors, rust at the bottom of the tank or white crust on fittings.
- Outdoor hose bibs and irrigation lines. A cracked spigot or a stuck sprinkler valve can run for days without a sound.
- A buried service line. If the meter runs and nothing inside is wet, the leak may be underground between the meter and the house, or between the main and the meter.
Meter running with everything off?
Close the main valve and call (773) 207-0518. A licensed plumber can trace the leak and give you a clear price before work starts.
Why your Blue Island bill may not match last month's use
Under the city code, residential water meters in Blue Island are read every other month, but the bill is issued monthly. That means the months between readings may not reflect a fresh look at your meter, so ask the city how each charge was figured. A sudden jump can be a true leak, a catch-up after a long gap between reads, or both.
To sort it out, compare the reading on your meter today with the reading printed on the bill. If the two numbers are close, the bill is probably fair. If they are far apart, call the Blue Island Water and Sewer Department at City Hall and ask how the latest charge was calculated.
Blue Island code section 52.020 has residential meters read every other month and billed monthly, so check your meter yourself between readings. The Water and Sewer Department also posts a High Water Usage Checklist in English and Spanish. Use it before you pay for a plumber visit.
Meter result and what to do next
Match what you saw at the meter to the row below. It tells you whether this is a DIY fix, a plumber visit or a conversation with the city.
| What the meter does | What it usually means | Next step |
|---|---|---|
| Stops with all water off | No leak right now, so the bill reflects use or estimates | Compare readings and ask the city about the bill |
| Moves with all water off, stops when main valve is closed | Leak is inside the house | Check toilets, fixtures and the water heater, then book leak detection |
| Moves even with main valve closed | Valve not sealing, or a leak between the meter and valve | Call a plumber to check the valve and exposed pipe |
| Moves, but interior is dry and the yard is wet or soft | Leak on the service line | Call a plumber for water line repair |
| Moves only at certain times | Toilet, softener or ice maker cycling | Test each one separately |
What a plumber can do that you cannot
Once the meter says a leak exists, finding it behind a wall or under a slab calls for tools. Guessing leads to open walls and repeated repairs.
Pressure test the lines
Isolating sections of pipe and watching a gauge shows which branch is losing water.
Acoustic listening
Sensitive ground microphones and pipe sensors pick up the hiss of water escaping under pressure.
Thermal imaging
A camera can show cool or warm patches behind drywall that point to a hot or cold line leaking.
Tracer gas
For hard cases, a safe gas is pushed into the pipe and sniffed out at the surface to mark the exact spot.
Our team handles leak detection with a clear price given before work starts. If the leak is underground between the street and your meter, the repair may fall under water line repair.
Check the city checklist, then check the plumbing
The city of Blue Island posts a High Water Usage Checklist, in English and Spanish, on its Water and Sewer Department page. It walks through the same logic as this meter test and gives you a record to show city staff if you dispute a charge. Print it, fill it in and keep your meter readings with it.
If the leak is confirmed and you repair it, keep the plumber's invoice. It shows the date the problem was fixed and supports any conversation with the city about the bill.
Billing rules come from the city code. Section 52.020 says residential meters are read every other month and billed monthly, and section 52.009 requires a shutoff just ahead of the meter. That shutoff is the valve you use for the meter test, so find it before you start.
Blue Island, IL: what local homeowners should know
The City of Chicago supplies Blue Island's water, and the city's Water and Sewer Department at 13051 Greenwood Avenue operates the local system. Under city code each main building must have its own water service pipe, tap and meter, with a shutoff just ahead of the meter. That shutoff is the valve you use to isolate the house during the meter test, so find it before you need it.
About 64.7% of Blue Island homes were built before 1970, and the median build year is 1961. Older homes mean older supply piping, older toilet parts and older service lines, all of which raise the odds of a slow leak. The city also posts senior water rates and a lead service line inventory on its site, which are worth reading if you own an older house.
Plumbing work in the city needs a permit, and the code asks contractors to be state-licensed. If your leak turns into a repair of the water service pipe, a licensed plumber handles the permit. We also reach homes in Riverdale and Crestwood, where each village runs its own water department and billing.
Questions homeowners ask
Turn off every water use, find the meter and look at the low-flow indicator. If it moves, or if the numbers change after 15 to 30 minutes, water is leaking.
Blue Island reads residential meters every other month and bills monthly, so a bill may not track a fresh reading every month. A hidden toilet or pipe leak also raises use without any visible sign.
Yes. A silent flapper leak can pass water for days without a sound, and it shows up as steady use on the meter. The food coloring test finds it in minutes.
Ask the Blue Island Water and Sewer Department where the line of responsibility sits for your property. A plumber can confirm the leak location, but the city decides its own boundaries.
Yes, if the leak is spraying or soaking a floor. Close the main shutoff, then call (773) 207-0518. Keep clear of wet outlets and appliances.
It is a PDF on the city Water and Sewer Department page, in English and Spanish. You can also call City Hall during business hours and ask for it.