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What Does It Mean When My Water Meter Runs but No Water Is On?

Last updated October 25, 2026

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The short answer

How to Check Your Water Meter

First, ensure every water source in your home is completely off. This includes toilets, ice makers, hose bibs, and any outdoor irrigation systems. Go to your water meter and watch the small flow indicator, often a triangular dial or a digital blinking light. If that dial is moving when no water is in use, you have a confirmed leak somewhere on your side of the meter.

Record the meter reading, then avoid using any water for an hour or two. Check the meter again after this period. If the numbers have increased, it confirms an ongoing leak. This simple test helps you understand the leak's severity before you take further action or call a plumber for diagnosis.

Common Causes of Hidden Leaks

Underground service line leaks between the meter and your home are a frequent culprit, especially in areas with shifting soil. Leaks can also occur in pressurized irrigation lines or a pool's automatic fill valve. Inside the house, a running toilet, a faulty refrigerator ice maker line, or a leak under a slab foundation can all cause the meter to run without your knowledge.

A leaky water heater pressure relief valve or a dripping water softener system can also waste water silently. Even a small leak from a pipe inside a wall can add up over time. Pinpointing the exact source often requires professional leak detection, as the water may travel far from the original break before causing visible damage.

  • A leaking main supply line underground.
  • A faulty toilet flapper causing constant, silent refilling.
  • A cracked pipe inside a wall or under the foundation slab.
  • A malfunctioning irrigation system or sprinkler valve.
  • A dripping water heater or a leaking appliance supply line.
  • A failed pressure regulator causing excessive system pressure.

Immediate Steps to Take

Your first priority is to stop the water flow and prevent further damage. Locate your main water shutoff valve, typically near where the water line enters your home or near the water heater. Turn this valve clockwise to shut off all water to the house. This action stops the leak's water source immediately, which is critical for limiting water damage and mold growth.

After shutting off the water, check if the meter has stopped. If it continues to run, the leak is likely between the meter and your shutoff valve, which is still your responsibility. If you live in Long Beach, keep your shutoff valve location written down. Document everything you see, including meter readings and any visible signs of water, for your plumber and potentially for an insurance claim.

Potential Water Damage Risks

A hidden leak can cause extensive damage long before you notice a wet spot. Water can saturate framing, insulation, and drywall, weakening structural materials. Persistent moisture behind walls or under floors creates an ideal environment for mold growth, which can begin within 24 to 48 hours and pose health risks to household members.

Water can also damage flooring, subflooring, and personal belongings. If the leak is from a sewage or drain line, it may involve contaminated water, requiring specialized cleanup. Addressing the water damage promptly is as important as fixing the leak itself to restore your home's safety and integrity.

When to Call a Water Damage Professional

After a plumber fixes the leak, you often need a water damage assessment. Moisture trapped inside building materials won't dry on its own and can lead to rot and mold. A water damage pro uses moisture meters and thermal imaging to find all affected areas you cannot see, ensuring a complete drying plan is created.

The pros handle water extraction, structural drying, and necessary repairs. They document all damage and the restoration process, which is helpful for insurance purposes. Policies vary, and your insurer decides what is covered. For significant leaks, this professional drying is crucial to prevent secondary damage and return your home to a dry, stable condition.

Water damage does not wait

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Frequently asked questions

Could a running meter just be a faulty meter?

It is possible but rare. To check, shut off your main house valve. If the meter stops, the leak is in your home. If it keeps running with your water off, the leak is between the meter and your valve, or the meter itself may be faulty. Contact your water utility to report a potential meter issue.

How much water am I losing from a hidden leak?

A small, steady leak can waste hundreds of gallons per month, significantly raising your bill. A larger leak from a broken pipe can lose several gallons per minute. The exact amount depends on the leak's size and pressure. Your water meter readings taken over a set time can help you estimate the loss.

Will my homeowners insurance cover the leak repair and damage?

Coverage depends on the leak's cause and your specific policy. Sudden, accidental leaks like a burst pipe are often covered, while damage from long-term neglect may not be. You must report the damage promptly. Policies vary, and your insurer decides what is covered. Always check your policy and document all damage thoroughly.

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