Short answer: To find a water leak underground, start with the meter: turn off all water and see if it moves. Then close the house main and the irrigation valve one at a time to isolate the leaking line. Walk the pipe's path for green, soggy or sinking spots. To pinpoint it, pros use acoustic listening, line locating and tracer gas.
A buried leak hides in plain sight. In Sarasota's sandy soil, water often drains down instead of pooling, so the yard may look fine. You can narrow the problem down a lot before you make a call. When it's time for exact pinpointing, SRQ Leak Pros can connect you with a local pro for underground water leak detection in Sarasota.
How to find a water leak underground: 6 steps
Step 1: Confirm there is a leak
Turn off every faucet, appliance and the irrigation system. Read the water meter and note the flow indicator. Use no water for two hours, then read it again. The EPA uses this same two-hour test. If the reading changed, water is leaking somewhere.
Step 2: Close the main shut-off at the house
Find the valve where the water line enters the house and close it. Watch the meter.
- Meter stops: the leak is inside the house or under the slab.
- Meter keeps moving: the leak is outside, between the meter and the house, or in a branch line.
Step 3: Shut off the irrigation system
Close the irrigation valve or backflow device, then watch the meter again. If it stops, the leak is in the sprinkler system. Run each zone and look for broken heads or soggy spots.
Step 4: Shut off other branches
Some homes have lines to a pool, a detached garage, an outdoor kitchen or a dock. If each has a valve, close them one at a time. The branch that stops the meter is the one leaking.
Step 5: Walk the pipe's path
Most service lines run in a fairly direct line from the meter to the house entry. Walk it and look for:
- A strip of grass that's greener or faster-growing
- Soggy or soft soil in dry weather
- Small sinkholes or settling
- Water at the edge of the driveway or a walkway
- Cracks in concrete near the line
- A hissing sound near the meter or the house entry
Step 6: Stop before you dig
Don't start digging on a hunch. Florida law requires a call to Sunshine 811 at least two full business days before digging, so gas, power and cable lines can be marked. A wrong guess can mean several holes, or a damaged utility line.
Found the leaking line but not the spot? Call to reach a local pro who can pinpoint it.
Call (941) 541-0938How pros pinpoint underground leaks
Wikipedia lists hydrostatic testing, tracer-gas testing, infrared and acoustic methods as standard ways to find pipeline leaks. Here's what each one does in a yard.
| Tool | How it works | Best for |
|---|---|---|
| Pressure test | A gauge shows whether a closed section loses pressure | Confirming which line leaks |
| Line locator | A transmitter and receiver trace the pipe's path and depth | Lines with no plans |
| Ground microphone | Amplifies the sound of water escaping a pressurized pipe | Metal and rigid pipe |
| Tracer gas | A safe gas is pushed into the drained line; a sensor finds it at the surface | Plastic pipe and quiet leaks |
| Infrared camera | Shows temperature differences on the surface | Hot lines and shallow leaks |
Wikipedia describes tracer-gas leak testing as a nondestructive way to detect leaks, used in industries from construction to manufacturing. In leak detection, it shines where acoustic tools can't hear much.
Why underground leaks are hard to find in Sarasota
- Sandy soil. Water drains down instead of surfacing.
- High water table. Near the coast, damp ground is normal, so a wet spot isn't proof.
- Plastic pipe. Newer lines are quiet, which makes listening harder.
- Long lines. Some lots have long runs from the street.
- Hardscape. Driveways and pavers hide the line's path.
Is it your leak or the utility's?
If water rises inside the meter box or bubbles in the street, report it to your utility first. Sarasota County's leak FAQ explains that its staff check reported leaks and decide whether each one is the county's or the customer's. Leaks between the meter and your house are usually yours. Read who is responsible for the water line.
How to prevent underground leaks
- Keep trees and large shrubs away from the service line's path.
- Have high water pressure checked and reduced.
- Replace old polybutylene or galvanized lines before they fail.
- Mark the line's path after it's been located.
- Read the meter monthly.
Local note: canal-side yards in Nokomis and bayfront lots in Osprey often stay damp, so rely on the meter, not the soil. In North Port, long lines make step 5 take longer. On Longboat Key, tight lots mean buried lines run close together, so 811 marks are vital.
Related reading: if the bill is what tipped you off, see why your water bill is so high. For more clues in the yard, read the signs of a water service line leak. If the leak is under the house, see what a slab leak is. First, find where your water line runs. For leaks under concrete, read about a driveway water line leak.
When should you call a leak detection professional?
Call a pro when:
- The meter moves with the house main and irrigation closed
- You can't find any surface clue along the line
- The leak is under a driveway, pavers or a pool deck
- You can't find or close your shut-off valves
Need the exact spot? Call (941) 541-0938 to reach a local underground leak pro.
Call (941) 541-0938Frequently asked questions
Can I find an underground leak without special tools?
You can often narrow it to one line with meter tests and valve shut-offs. Finding the exact spot usually takes a pro's tools.
How deep are water service lines in Sarasota?
Depth varies by property and age. Many residential lines are fairly shallow, but a line locator is the only way to know for sure.
What does an underground water leak sound like?
Through a ground microphone it often sounds like a hiss or steady rush. You may hear it yourself near the meter or the house entry if it is large.
Is tracer gas safe for my yard?
The gases used are chosen to be safe. Ask the provider which gas they use and how the test works.
Sources
Related guides
Finding LeaksWhy Is My Water Bill So High? A Step-by-Step Leak Checklist
A room-by-room checklist to find out why your bill jumped, starting with the water meter.
Service Lines9 Signs of a Water Service Line Leak
Nine clues that the buried pipe from your meter is leaking, plus a simple test to confirm it.