Fixing a Dripping Tap: Understanding Cartridge, Ball, and Ceramic Disc Types

Why Tap Type Matters Before You Touch a Wrench

A dripping tap is one of the most wasteful problems a household can let slide. A single tap dripping once per second can waste roughly 3,000 gallons of water per year — and the repair often costs less than $15 in parts. The most common DIY mistake is buying the wrong replacement component, which almost always happens because the homeowner didn't identify the tap mechanism first.

There are three mechanisms found in most US residential taps:

• Cartridge taps — single or double-handle designs that use a replaceable plastic or brass cartridge to control flow. Very common in bathroom vanities and kitchen sinks made after the 1980s.
• Ball taps — single-handle designs where a rotating ball-shaped cap controls both temperature and flow simultaneously. Recognizable by the lever that swivels in all directions; common in kitchens.
• Ceramic disc taps — single-lever designs with a wide cylindrical body. Two ceramic discs rotate against each other to control water. These are the most durable type; a drip here often signals a cracked disc or mineral buildup rather than a worn washer.

Older homes may have compression taps — the original two-handle design repaired by replacing a rubber washer on a threaded stem. That repair is even simpler but isn't covered in depth here since compression taps are increasingly rare in post-1970s construction.

Water waste compounds quickly across multiple fixtures. If you're tackling plumbing issues room by room, our guide to stopping a running toilet addresses a similarly common and costly problem.

Before You Start

Confirm you have the right prerequisites and all tools within reach before shutting off the water. Leaving a tap disassembled while making a hardware store run is both inconvenient and risks losing small parts.

For part identification, look for a brand name or model number stamped on the tap body near the base or beneath a decorative cap. If the marking isn't visible, take the disassembled cartridge or ball assembly to the hardware store for a physical match — store staff can usually identify common models on sight.

Step-by-Step Repair

Steps 1 through 3 apply to all tap types. Steps 4, 5, and 6 are mechanism-specific — read each heading and follow only the one that matches your tap.

Testing and Preventing Future Drips

Once reassembled, turn the shut-off valve back on slowly. Open the tap to release trapped air — a brief sputter is normal — then close it fully. Watch the spout for 60 seconds. A few initial drips from residual water in the body are expected; persistent dripping after a minute means the new part isn't fully seated. Check orientation before overtightening anything, especially with ceramic disc cylinders, which crack under excessive torque.

To extend the life of your repair, avoid forcing tap handles closed. Cartridge and ceramic disc taps seal with light hand pressure — cranking them tight accelerates wear on the new components. In hard-water areas, an annual wipe-down of disc surfaces and a light re-greasing of O-rings during routine cleaning can prevent the mineral buildup that triggers most ceramic disc drips.

If the drip continues after a correct part replacement, the internal seat (the surface the washer or disc presses against) may be pitted or corroded — a condition that requires a seat wrench and dressing tool to fix, but remains within DIY reach with additional research. When any step involves pressurized supply lines you're not confident working with, consulting a licensed plumber is the straightforward call.