Calling a plumber for every minor issue can cost you hundreds of dollars per visit. Many of the most common plumbing problems — leaky faucets, running toilets, clogged drains, and low water pressure — are well within the reach of a confident DIYer. This guide walks you through how to diagnose and fix them.
Fix a Leaky Faucet
A dripping faucet wastes over 3,000 gallons of water per year and is the most common plumbing complaint in homes. The fix depends on the faucet type.
For a compression faucet (older style with two separate hot/cold handles):
- Turn off the water supply valves under the sink.
- Remove the handle by unscrewing the decorative cap and the screw underneath.
- Unscrew the packing nut and pull out the stem.
- Replace the rubber washer at the bottom of the stem.
- Reassemble and turn the water back on.
For a ball or cartridge faucet (single-handle style): Purchase a repair kit specific to your faucet brand (Delta, Moen, etc.) — it includes all replacement parts and detailed instructions. Most single-handle faucet repairs take 30 minutes.
Fix a Running Toilet
A running toilet can waste 200 gallons of water per day. The culprit is almost always one of three components inside the tank: the flapper, the fill valve, or the float.
Diagnose first: Remove the tank lid and listen. If you hear water trickling, add a few drops of food coloring to the tank. If color appears in the bowl without flushing, the flapper is leaking.
Replacing the flapper (most common fix):
- Turn off the supply valve at the base of the toilet.
- Flush to empty the tank.
- Unhook the old flapper from the pegs on the overflow tube and disconnect the chain from the flush handle arm.
- Snap the new flapper onto the pegs and hook the chain, leaving about 1/2 inch of slack.
- Turn the water back on and test.
Replacement flappers cost $5–$10 and are universal for most toilet models.
Unclog a Drain
Slow or clogged drains in sinks, showers, and tubs are caused by buildup of hair, soap scum, and grease. Try these methods in order before calling a plumber:
Method 1 — Boiling water: For kitchen grease clogs, carefully pour boiling water directly down the drain in two or three stages. This melts grease and clears mild blockages.
Method 2 — Baking soda and vinegar: Pour 1/2 cup of baking soda followed by 1/2 cup of white vinegar down the drain. Let it foam for 15 minutes, then flush with hot water.
Method 3 — Drain snake (hair clogs): A $10 plastic drain snake (also called a Zip-It) pulls out hair clogs from sink and shower drains. Insert it, twist, pull out the clog. This is the most effective method for bathroom drains.
Method 4 — Plunger: For kitchen sinks, use a cup plunger with a full seal over the drain opening. Cover any overflow opening with a wet rag before plunging to create pressure.
Avoid chemical drain cleaners for regular maintenance — they’re corrosive to pipes and often don’t fully dissolve deep clogs.
Fix Low Water Pressure
Weak water pressure from a specific faucet or showerhead is usually caused by mineral buildup in the aerator or showerhead rather than a pipe issue.
For faucets: Unscrew the aerator (the small mesh screen at the faucet tip). Soak it in white vinegar for 30 minutes, scrub with a toothbrush, and reinstall. This usually restores full pressure.
For showerheads: Remove the showerhead and soak it in a bag of white vinegar secured with a rubber band overnight. The mineral deposits dissolve completely, restoring full flow.
If low pressure affects your entire home (not just one fixture), check your main shutoff valve to confirm it’s fully open, and contact your water company to rule out supply issues.
Fix a Leaking Pipe Under the Sink
Most under-sink leaks come from the P-trap (the curved pipe section) or the supply line connections rather than the pipes themselves.
For P-trap leaks: Tighten the slip-joint nuts by hand first. If that doesn’t stop the leak, replace the P-trap — they’re inexpensive ($8–$15 at hardware stores) and install without tools in 10 minutes.
For supply line leaks: Turn off the supply valve, unscrew the old supply line, and replace with a braided stainless steel supply line ($10–$15). These are far more durable than plastic and less likely to fail.
When to Call a Plumber
Some plumbing issues require professional help:
- Sewage backing up into multiple drains (indicates a main sewer line blockage)
- No hot water from the water heater
- Water damage in walls or ceilings (suggests a hidden pipe leak)
- Any work involving gas lines
- Major pipe bursts or flooding
For these situations, cutting costs by DIYing can lead to far larger expenses. Know your limits.
FAQ About Home Plumbing Repairs
Q: Do I need to turn off the main water supply to fix a toilet?
A: No — most toilets have their own shutoff valve on the supply line behind the toilet. Turn that valve clockwise to cut water to the toilet only, without affecting the rest of the house.
Q: How do I know if a pipe leak is serious?
A: Active dripping, water stains on ceilings or walls, unexplained spikes in your water bill, or the sound of running water when no fixtures are on all indicate a potentially serious leak that warrants a professional inspection.
Q: Can I use Teflon tape on any plumbing joint?
A: Teflon (PTFE) tape is used on threaded pipe connections to create a watertight seal. It’s not used on compression fittings or flare fittings. Wrap it clockwise around the threads before assembly.
Q: How often should I clean my drain aerators?
A: In areas with hard water, every 6 months. In soft water areas, once a year is sufficient. If you notice reduced flow, check the aerator immediately.
Q: Is it safe to use a drain snake myself?
A: Manual plastic drain snakes (Zip-Its) are completely safe for DIY use. Motorized pipe snakes are more powerful and should be used carefully to avoid damaging pipes — if you’re not experienced, rent one with guidance from the store.
Sources & Further Reading
- This Old House — DIY Plumbing Repair Guides
- Family Handyman — Fix a Leaky Faucet Step-by-Step
- EPA WaterSense — Fix a Leak Week Resources
- Bob Vila — Home Plumbing Problems and Solutions