High Water Bill With No Visible Leak

• A toilet flapper that does not seal, passing water down the drain silently around the clock
• An irrigation zone valve that seeps, or a controller running longer or more often than intended
• A pool auto-fill valve topping up a pool that is losing water
• A water softener stuck in a regeneration cycle
• A service line leak between the meter and the house
• A slab leak or concealed supply leak inside the structure
• Seasonal use changes: guests, new landscaping, a pool refilled, a rate change on the bill itself

Start with the bill itself and confirm it reflects higher consumption rather than a rate change or a longer billing period. Then run the meter test with everything off. If the meter moves, you have a continuous loss and the next step is isolation.

Add food coloring to each toilet tank and wait without flushing; color appearing in the bowl means that flapper is passing water. Shut the irrigation supply and re-read the meter. Turn off any pool auto-fill and monitor the pool level separately.

When the fixtures test clean, irrigation is isolated, the pool is accounted for, and the meter still moves with the house valve closed or open. At that point the loss is in piping you cannot see, and the question shifts from what to where.

Detection separates the house from the yard, hot from cold, and branch from branch until one section fails to hold. Listening and scanning then narrow that section to a location. The bill stops being a mystery and becomes a specific repair.