Fix a Leaky Faucet: Common Repair Solutions

Understanding Common Faucet Leak Types and Their Causes

A leaky faucet is one of the most common household plumbing issues, affecting millions of homeowners each year. According to the U.S. Environmental Protection Agency, a single dripping faucet can waste over 3,000 gallons of water annually—enough to fill a swimming pool. Understanding what type of leak you have is the first step toward fixing it effectively.

Faucet leaks fall into several distinct categories based on where the water escapes. A drip from the spout is the most noticeable type, often caused by a worn-out internal seal or cartridge. This type of leak typically occurs when the faucet is in the off position and water continues to drip steadily. A leak underneath the faucet, near the base or under the sink, suggests a problem with the supply line connections or internal seals that allow water to bypass the valve entirely. Leaks around the handle area indicate that seals protecting the handle stem have deteriorated, allowing water to seep out during use or even when the faucet is off.

The underlying causes of these leaks are fairly consistent across different faucet types. Hard water deposits build up inside the valve, preventing it from sealing completely. Mineral accumulation can be particularly problematic in areas with high mineral content in the water supply. Over time, rubber washers and O-rings inside the faucet dry out, crack, and lose their ability to create a watertight seal. Constant use wears down internal components, and temperature fluctuations can cause metal parts to expand and contract, creating gaps where water escapes.

Practical takeaway: Identify where your leak is occurring by observing whether water drips from the spout, pools under the sink, or seeps from the handle area. This observation will guide which repair approach or replacement part you'll need.

Tools and Materials You'll Need Before Starting

Before attempting any faucet repair, gather the right tools and materials. Having everything on hand prevents frustration and unnecessary trips to the hardware store. Most faucet repairs can be completed with basic tools that many homeowners already possess.

Essential tools include an adjustable wrench, which is used to tighten or loosen connection nuts around the faucet base and supply lines. A Phillips and flathead screwdriver set allows you to remove handle covers and access internal components. Pliers, particularly needle-nose pliers, help you grip and manipulate small parts inside the faucet. A flashlight or headlamp improves visibility when working under the sink or inside tight spaces. A bucket is invaluable for catching water that remains in the lines after you turn off the water supply. You may also want a basin wrench, a specialized tool with a long handle that reaches nuts behind and above the sink rim, though this is optional for simpler repairs.

For materials, keep several types of washers and O-rings on hand. These come in various sizes, so purchasing an assortment kit (typically $5 to $15) covers most situations. Plumber's grease or silicone-based lubricant helps reassemble components smoothly and prevents future sticking. Teflon tape, also called plumber's tape, seals threaded connections and costs just a few dollars. For some repairs, you may need a cartridge replacement kit specific to your faucet model, which can range from $10 to $50 depending on the faucet type. White vinegar serves as an inexpensive cleaning solution for removing mineral deposits without harsh chemicals.

Practical takeaway: Create a basic plumbing repair kit and store it in an accessible location. Start with an adjustable wrench, two screwdrivers, pliers, a bucket, and an assortment of washers and O-rings. This preparation reduces delays and makes repairs more manageable.

Turning Off Water Supply and Preparing Your Work Area

Before touching any part of your faucet, you must shut off the water supply. This critical step prevents water from spraying everywhere and flooding your home. Most sinks have individual shut-off valves located under the sink, accessible by opening the cabinet doors. These valves look like small knobs or handles attached to the water supply lines coming from the wall.

Locate these shut-off valves and turn them clockwise until they stop. Turn both the hot and cold water valves, even if only one is leaking, because you'll need to disassemble parts that affect both supplies. After closing the valves, turn on the faucet to confirm the water has stopped flowing. If water continues to run, the shut-off valves may be faulty, and you'll need to use the main water shut-off for your entire house, typically found near your water meter in the basement or outside.

Once the water is off, place your bucket under the faucet or under the area where you'll be working. Even after shutting off the supply, water remains trapped in the pipes and faucet components. When you disconnect parts, this water will drain out. Position old towels around your work area to catch any spills and protect your flooring or cabinet finish. Good lighting is essential—either use your flashlight or position a work light to illuminate the area clearly. Clear away items stored under the sink to give yourself adequate workspace. Remove drain traps if they obstruct your access to faucet connections.

Practical takeaway: Always verify the water is off by turning on the faucet before you begin. Place a bucket underneath, spread out towels, and ensure you have adequate lighting and space. These simple preparation steps make repairs cleaner, safer, and less stressful.

Repairing Compression Faucets with Worn Washers

Compression faucets, also called two-handle faucets, are among the oldest and most common faucet designs. They use separate handles for hot and cold water, and internally they rely on rubber washers that compress against a valve seat to stop water flow. When these washers wear out, water continues to drip even when the faucet is fully closed. This type of leak is among the most straightforward to repair.

Start by removing the decorative cap or handle cover, which often requires gently prying with a flat screwdriver. Underneath, you'll find a screw holding the handle in place. Remove this screw and carefully lift off the handle. You'll now see the packing nut, a hexagonal nut that you turn counterclockwise with your adjustable wrench. Once the packing nut is loose enough to remove by hand, you can pull out the stem—the long shaft that moves up and down when you turn the handle.

At the bottom of the stem, you'll find the washer, typically held in place by a brass screw. This washer, usually rubber or neoprene, is almost certainly worn, hardened, or cracked if your faucet is dripping. Remove the screw carefully (it may be stuck), take out the old washer, and replace it with a new one of the same size. The valve seat—the part the washer presses against—should also be inspected. If it feels rough or pitted, you can smooth it with a valve seat dresser (a specialized tool) or replace the entire stem with a new one. Reassemble by inserting the stem, tightening the packing nut, and reattaching the handle.

Practical takeaway: For a dripping compression faucet, the washer replacement is usually the solution. This repair takes 15 to 30 minutes and costs just a few dollars. If you encounter a stuck screw or pitted valve seat, consider replacing the entire stem as a complete solution.

Fixing Cartridge and Ball Faucets with Replacement Cartridges

Modern single-handle faucets come in two main styles: cartridge faucets and ball faucets. Both operate differently from compression faucets and typically require replacing internal cartridges rather than just washers when they leak. A cartridge is a cylindrical component containing multiple chambers and seals that regulate water flow and temperature. When the cartridge wears out, water leaks from the spout even when the handle is in the off position.

For cartridge faucets, begin by removing the handle. Some handles have a small decorative cap that pops off, revealing a screw. Others have the screw directly visible. Once you remove the screw, lift off the handle and set it aside. Next, you'll see a collar or cap that twists off