One drop every second doesn’t look like much. It’s easy to walk past a slowly dripping faucet for months, telling yourself you’ll get to it eventually. But drops add up faster than most people expect, and a faucet dripping at just one drop per second can waste thousands of gallons over the course of a year, according to EPA WaterSense estimates. That’s before accounting for faster leaks, which are common once a worn washer or cartridge gets a little worse. The good news is that the fix is almost always inexpensive and quick, which makes the math on “I’ll get to it later” pretty lopsided once you actually see the numbers.
The Actual Numbers
According to the EPA’s WaterSense program, a faucet dripping at one drop per second can waste more than 3,000 gallons of water in a year, roughly the amount needed for 180 showers. Faster leaks waste dramatically more. A faucet that’s visibly running rather than dripping can waste tens of gallons a day, which compounds into a genuinely significant number over 12 months. None of this requires a dramatic leak to add up. It’s the slow, easy-to-ignore drip that quietly costs the most over time simply because it goes unaddressed the longest.
Why Faucets Start Dripping in the First Place
Almost every dripping faucet comes down to a worn seal somewhere inside: a rubber washer in a compression faucet, a worn ceramic disc or cartridge in a modern single-handle faucet, or O-rings that have hardened and lost their seal over years of use. Mineral buildup from hard water accelerates this wear considerably, which is part of why homes in hard water areas often see faucets start dripping sooner than the same fixture would in soft water conditions.
Why This Fix Rarely Waits for a “Convenient Time”
A washer or cartridge replacement typically costs under twenty dollars in parts and takes less than an hour for most single-handle or two-handle faucets, once the water supply is shut off under the sink. Compared against a year of wasted water, thousands of gallons that show up as a real, if quiet, addition to a water bill, the repair pays for itself almost immediately. The larger cost most homeowners actually pay isn’t the water bill, it’s the cumulative effect of a fixture that keeps degrading; a drip today is often a faster leak in a year if the worn part is never replaced.
Fixing It Yourself vs. Calling a Pro
Most dripping faucets are a reasonable DIY repair: shut off the supply valves under the sink, remove the handle, replace the worn washer, cartridge, or O-ring with the correct part for that faucet model, and reassemble. The one step that trips people up most is identifying the correct replacement part, since cartridge designs vary significantly between brands and even between models from the same brand. Bringing the old part to a hardware store, or looking up the faucet’s model number, usually solves that.
Quick Pro Tip: Before buying a replacement part, check the exact brand and model printed on the faucet body or in the original installation paperwork. A universal “compatible” cartridge often isn’t, and an incorrect one is the most common reason a DIY faucet repair still leaks afterward.
Common Mistakes
- Ignoring a drip because it seems too minor to bother with, without realizing the actual annual water total.
- Overtightening the faucet handle to try to stop the drip, which often damages the cartridge or seat further instead of fixing anything.
- Buying a generic replacement cartridge without confirming it matches the exact faucet brand and model.
- Fixing the drip without also checking for mineral buildup inside the fixture, which can cause the same washer or cartridge to wear out again sooner than expected.
When to Call a Professional
Call a plumber if the drip continues after replacing the washer or cartridge, if the faucet is old enough that replacement parts are no longer available, or if you notice the leak is actually coming from inside the wall or under the sink rather than from the faucet spout itself, which points to a supply line or valve issue rather than the faucet fixture.
FAQs
Q: How much water does a dripping faucet really waste in a year?
A: A faucet dripping at one drop per second can waste more than 3,000 gallons annually, according to EPA WaterSense estimates, and faster leaks waste considerably more.
Q: Is fixing a dripping faucet a reasonable DIY project?
A: For most single-handle or two-handle faucets, yes, once you shut off the supply valves and have the correct replacement washer or cartridge for that exact model.
Q: Why does my faucet keep dripping even after I replaced the washer?
A: The most common reason is an incorrect replacement part for that specific faucet model, though mineral buildup or a damaged valve seat can also cause a repair to fail.
Q: Does hard water make faucets drip more often?
A: Yes. Mineral deposits accelerate wear on washers, cartridges, and seals, which is part of why hard water areas tend to see more frequent faucet repairs.
Q: Is a slow drip actually worse than it looks?
A: In terms of cumulative cost, often yes. A slow, easy-to-ignore drip tends to run unaddressed for far longer than a faster leak, which people notice and fix sooner.
Key Takeaways
- A faucet dripping once per second can waste over 3,000 gallons a year.
- Nearly every drip comes down to a worn washer, cartridge, or O-ring.
- The repair typically costs under twenty dollars and takes less than an hour.
- Matching the exact faucet brand and model to the replacement part is the step most DIY repairs get wrong.