Few things are more annoying than the phantom flush of a running toilet at 3 a.m. or the steady drip-drip-drip of a leaky outdoor spigot that’s slowly turning your yard into a swamp. These common fixture problems waste a surprising amount of water: a running toilet alone can burn through 200 gallons per day, according to the EPA. The good news? Most of these issues are straightforward fixes that don’t require a plumbing license or expensive service calls. Whether you’re dealing with a toilet that won’t stop cycling, a spigot that weeps every time you shut it off, or a kitchen faucet that drips despite your best efforts to crank the handle tighter, this guide to common fixture problems and fixes will walk you through practical, step-by-step solutions. You’ll also learn when a problem has crossed the line from “weekend project” to “call a pro before things get worse.”
Identifying and Stopping a Running Toilet
A running toilet is one of the most common plumbing complaints, and it’s almost always caused by one of three components inside the tank: the flapper, the fill valve, or the flush valve assembly. Before you do anything, take the lid off the tank and flush. Watch what happens. Does water keep flowing past the flapper? Does the fill valve shut off, or does it keep running? Does the float rise to the correct level? These observations will tell you exactly where to focus your effort.
Inspecting the Flapper and Chain
The flapper is a rubber seal at the bottom of the tank that lifts when you flush and drops back down to stop water from flowing into the bowl. Over time, flappers warp, crack, or develop mineral deposits that prevent a tight seal. If you see water trickling into the bowl after a flush, press down on the flapper with your finger. If the running stops, you’ve found your culprit.
Replacement flappers cost $3 to $8 at any hardware store. Turn off the water supply valve behind the toilet, flush to drain the tank, and unhook the old flapper from the overflow tube ears. Snap the new one on, reconnect the chain, and turn the water back on. The chain itself matters too: if it’s too long, it can get caught under the flapper; too short, and the flapper can’t seal fully. Leave about half an inch of slack.
Adjusting the Fill Valve and Float
If the flapper looks fine but water keeps running, the fill valve might be the issue. The float (either a ball on an arm or a cylinder that rides up the valve shaft) tells the fill valve when to stop letting water into the tank. If the float is set too high, water rises above the overflow tube and drains continuously into the bowl.
For a ball float, bend the arm slightly downward so the ball sits lower. For a cylinder float, pinch the clip on the side and slide it down about half an inch. The water level should sit roughly one inch below the top of the overflow tube. Flush and watch: if the valve shuts off cleanly at the right level, you’re done.
Replacing the Flush Valve Assembly
Sometimes the entire flush valve assembly, the vertical tube the flapper connects to, is cracked or corroded. This is a bigger job but still manageable for a confident DIYer. You’ll need to disconnect the water supply, drain the tank completely, and unbolt the tank from the bowl. The flush valve is secured by a large locknut underneath.
Swap in the new assembly (kits run $15 to $25), reassemble everything with fresh tank bolts and gaskets, and reconnect the supply line. This repair takes about 45 minutes if you’ve never done it before. If the porcelain around the bolt holes is cracked or the tank itself is damaged, though, you’re looking at a full toilet replacement rather than a valve swap.
Repairing Leaky Outdoor Spigots and Hose Bibbs
A leaky outdoor spigot isn’t just annoying: it can cause foundation damage, attract pests, and spike your water bill. Most outdoor hose bibbs use a compression-style valve, which means the fix usually involves either tightening a nut or replacing a small rubber component.
Tightening the Packing Nut
The packing nut sits just behind the handle of the spigot. When water leaks around the handle while the spigot is on, this nut has likely loosened over time. Grab an adjustable wrench and give it a quarter turn clockwise. That’s often all it takes.
If tightening doesn’t stop the drip, the packing material behind the nut may be worn out. Remove the nut, pull out the old packing (it looks like string or a small rubber washer), and replace it. Graphite packing string is cheap and available at most hardware stores. Wrap it around the valve stem a few times, snug the nut back down, and test.
Replacing Worn Washers and O-Rings
If the spigot drips from the spout even when fully closed, the seat washer at the end of the valve stem is probably shot. Turn off the water supply to that spigot (there’s usually a shutoff inside the house on the same line), then remove the handle and unscrew the packing nut to pull the entire stem out.
At the bottom of the stem, you’ll find a small rubber washer held in place by a brass screw. Replace both the washer and the screw: they’re sold together in multi-packs for a couple of dollars. While you have the stem out, check the O-rings along its body and replace any that look flat, cracked, or brittle. Reassemble, turn the water back on, and your spigot should close cleanly without any drip.
Troubleshooting Common Faucet Drips
Kitchen and bathroom faucets drip for different reasons depending on their design, but the result is always the same: wasted water and a sound that slowly drives you crazy. A faucet dripping once per second wastes over 3,000 gallons per year.
Cartridge and Valve Seat Replacement
Most modern faucets use a cartridge rather than the old-school rubber washer design. If your single-handle faucet drips, the cartridge is almost always the problem. Turn off the supply valves under the sink, remove the handle (usually a small set screw under a decorative cap), and pull the cartridge straight out. Bring it to the hardware store to match the replacement: cartridge designs vary widely between brands.
For older two-handle faucets with compression valves, the valve seat inside the faucet body can become pitted or corroded, which prevents the washer from sealing. You can either regrind the seat with a seat-grinding tool ($10 to $15) or replace it entirely if it’s threaded. A smooth, even seat surface is essential for a drip-free seal.
Cleaning Aerator Mineral Buildup
Sometimes what looks like a faucet problem is actually a clogged aerator. Mineral deposits, especially in areas with hard water, build up inside the small screen at the tip of the faucet. This can cause sputtering, uneven flow, or reduced pressure that mimics other issues.
Unscrew the aerator by hand or with pliers (wrap the jaws in tape to avoid scratching the finish). Soak it in white vinegar for a few hours, scrub the screen with an old toothbrush, and rinse. If the screen is too far gone, replacement aerators cost $3 to $5. This five-minute fix solves the problem about 30% of the time when people think they need a whole new faucet.
Addressing Low Water Pressure in Fixtures
Low water pressure at a single fixture is usually a localized issue rather than a whole-house problem. Start by checking the obvious: are the supply valves under the sink fully open? It sounds basic, but partially closed valves are a surprisingly common cause, especially after recent work under the sink.
If the valves are open, check the aerator (as described above) and the supply lines themselves. Flexible braided supply hoses can kink, and older galvanized steel pipes develop internal corrosion that narrows the flow path over time. If you have galvanized pipes and low pressure at multiple fixtures, the pipes themselves may need replacing: that’s a job for a professional.
For showerheads with weak flow, unscrew the head and check for a flow restrictor disc inside the connection point. Mineral buildup on this disc can choke the flow significantly. A vinegar soak and scrub usually restores full pressure. If only the hot water side has low pressure, sediment buildup in your water heater could be restricting flow through the hot supply lines.
Essential Tools and Safety for DIY Plumbing
You don’t need a massive tool collection to handle these common fixture repairs. A basic plumbing toolkit should include:
- Adjustable wrench (10-inch handles most residential fixtures)
- Tongue-and-groove pliers (Channel-lock style)
- Flathead and Phillips screwdrivers
- Plumber’s tape (Teflon tape) for threaded connections
- Bucket and old towels for catching residual water
- Flashlight or headlamp for under-sink work
Safety is straightforward but worth mentioning. Always turn off the water supply before disassembling anything. Know where your main shutoff valve is in case a supply valve fails or a connection breaks unexpectedly. If you’re working on hot water lines, give them a few minutes to cool. And if a project involves soldering copper pipe, keep a fire extinguisher nearby: it’s not paranoia, it’s common sense.
When to Call a Professional Plumber
Not every plumbing problem belongs on your weekend to-do list. If you notice water stains on ceilings or walls, that suggests a leak inside the wall cavity that requires opening up drywall and possibly replacing pipe sections. Sewer line issues, anything involving gas lines, or problems with your main water supply line are all situations where the risk of making things worse far outweighs the cost of a service call.
A good rule of thumb: if the repair requires permits, involves pipes you can’t see, or could cause significant water damage if something goes wrong, hire a licensed plumber. The average service call in 2026 runs $150 to $300 for straightforward work, which is far cheaper than repairing water damage to floors and subfloors.
Fixing a running toilet, a leaky spigot, or a dripping faucet are among the most satisfying home repairs because they’re quick, inexpensive, and immediately noticeable. The silence after you stop a phantom flush is genuinely blissful. Keep a small kit of replacement flappers, washers, and O-rings on hand so you can tackle these problems the moment they start rather than letting them waste water for weeks. And when a problem is beyond your comfort level, don’t hesitate to call in a pro: knowing your limits is just as valuable as knowing how to swap a flapper.