Sudden High Water Bill? Hidden Leak Checklist
If your usage jumped and nothing about your household changed, a hidden leak is the most common explanation — here's how to narrow it down before calling a plumber.
If your usage jumped and nothing about your household changed, a hidden leak is the most common explanation — here's how to narrow it down before calling a plumber.
Water bills usually stay fairly steady month to month. A sudden, unexplained jump — with no new appliances, guests, or irrigation changes — is one of the clearest signs of a hidden leak somewhere in the system.
Turn off every fixture and appliance in the house, then check the water meter's leak indicator (usually a small triangle or dial). If it's still moving with everything off, water is escaping somewhere between the meter and your fixtures.
Toilets are the single most common source of a silent leak. A few drops of food coloring in the tank that show up in the bowl within 10-15 minutes without flushing means the flapper is leaking.
A cracked hose bib or an irrigation line break can run for days unnoticed, especially on a line that isn't used daily. Walk the perimeter of the property looking for unusually soft or green patches of ground.
Check under sinks, behind the water heater, and around the washing machine hookup for damp cabinets, warped flooring, or a faint hissing sound — all common signs of a slow supply-line leak.
If the meter confirms water is running but you can't find the source after checking the obvious spots, it's likely underground or inside a wall — that requires professional leak detection equipment to pinpoint without unnecessary digging or demolition.
Reviewed by the Rush Plumber team — licensed, insured plumbers serving Torrance, CA and the South Bay, 3610 Torrance Blvd, Torrance, CA 90503. Call (209) 860-5004, 24/7.
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