Common Plumbing Problems

Water that tastes or smells off -- chlorine, rotten eggs, metallic, musty -- has a specific cause for each type. Identifying what it tastes or smells like is the fastest path to the right fix.

Rotten or musty smell coming from the bathtub drain -- caused by hair and soap scum biofilm in the P-trap, dry trap from disuse, or a venting problem allowing sewer gas through.

Tub draining slow or holding standing water? Almost always a hair clog in the stopper, crossbar, or P-trap. Soap scum and conditioner cement it into a dense mat. Clearable in under 30 minutes.

Chips and cracks in porcelain, enamel, fireclay, composite, and acrylic sinks range from cosmetic to structural. Small chips fix with a touch-up kit. Larger cracks may need refinishing or replacement.

Tap water tastes or smells like a swimming pool -- caused by municipal chlorine or chloramine disinfection that is detectable at normal treatment levels.

Motor hums but nothing grinds? Something is wedged between the impeller and shred ring. Ten-minute fix with a 1/4-inch Allen wrench.

Disposal leaks come from three places: top (sink flange), side (discharge pipe or dishwasher hose), or bottom (internal seal failure). Where it leaks tells you whether it is a simple fix or a replacement.

Garbage disposal runs but water backs up in the sink instead of draining -- caused by a clogged drain line, blocked dishwasher knockout plug, or impacted food waste in the discharge tube.

Flip the switch and get nothing -- no hum, no sound? That is electrical, not a jam. Tripped reset, tripped breaker, or bad switch are all quick fixes. Burned-out motor means replacement.

One drip per second wastes over 3,000 gallons a year. Usually a worn cartridge, washer, or seal -- straightforward DIY fix that stops the waste and the noise.

Chrome, brushed nickel, or other faucet finish is flaking, bubbling, discoloring, or corroding -- caused by harsh cleaners, hard water, manufacturing defects, or age.

Kitchen or bathroom faucet handle is stiff, hard to turn, or completely stuck -- caused by mineral buildup, a seized cartridge, corroded stem, or worn O-rings.

Faucet drips from the spout after being turned off -- caused by a worn cartridge, damaged valve seat, fatigued spring, or deteriorated O-ring inside the valve body.

Pull-down or side sprayer has low pressure, sputters, or will not switch between spray modes -- caused by a clogged head, kinked hose, or failed diverter.

Water freezing inside a pipe generates over 2,000 PSI -- enough to split copper, PEX, or PVC. Pipes in exterior walls, crawl spaces, attics, and garages are most vulnerable. Quick thawing before a burst saves thousands.

White, chalky deposits on everything -- faucets, shower heads, glass doors, inside pipes and water heaters. Calcium and magnesium restrict flow, kill efficiency, shorten appliance life. About 85% of US homes have hard water.

White crusty deposits on faucets, shower doors, dishes, and fixtures -- caused by high mineral content in your water supply that leaves calcium and lime residue when water evaporates.

Unexplained spike in your water bill usually means a hidden leak, running toilet, or dripping fixture. Finding and fixing it saves hundreds per year.

Running out of hot water faster than usual -- showers go cold, dishwasher gets lukewarm water, or multiple fixtures cannot run hot at the same time.

Water escaping around, under, or between shower door panels -- worn seals, misaligned doors, bad caulk, or spray hitting the gaps directly. Most fixes take under an hour and cost less than $30.

Leak can come from supply lines, shutoff valves, faucet connections, drain, or P-trap. The cabinet hides it, so it often goes unnoticed until damage is underway. Finding the exact source is step one.

Water dripping from around the valve handle or packing nut -- packing failure, not a pipe leak. Fix is usually tightening the nut or replacing the packing, often with the water still on.

Water around the base demands immediate attention -- floor damage, mold, electrical hazards. Could be loose fittings, a failing T&P valve, a bad drain valve, or a rusted-through tank that needs replacement.

Handle wobbles, spins, or feels loose? Spout rotates when it should not? Almost always a loose set screw, worn adapter, or deteriorated O-rings. Ten-minute fix, often costs nothing.

RO system filling slowly, weak trickle, or running out of water? Clogged pre-filters, worn membrane, low feed pressure, or waterlogged tank. Most fixes are filter replacements or pressure adjustments.

Weak shower flow? Could be a clogged head, partially closed valve, worn cartridge, low house pressure, or an aggressive flow restrictor. Fix depends on whether the problem is shower-only or whole-house.

Could be a clogged aerator or partially closed valve (five-minute fix), or a failing PRV, corroded pipes, or municipal issue. First step: is it one fixture, one area, or the whole house?

Black, pink, or orange mold growing in shower grout lines -- caused by persistent moisture, poor ventilation, and unsealed or deteriorating grout.

No hot water from any fixture? Cause depends on gas vs. electric. Common culprits: pilot light out, tripped breaker, failed element, faulty thermostat or gas valve.

Whistling, screaming, chattering, or banging -- each sound has a specific cause. Whistling means restriction. Chattering means worn washer or cartridge. Banging when it shuts off is water hammer. Match the sound to the fix.

Grinding means worn bearings. Rattling means debris or loose hardware. Banging means check valve slam. Each sound points to a different fix. Address it before a minor noise becomes a complete pump failure.

Toilet refills on its own without anyone flushing? Tank is silently leaking into the bowl through a worn flapper. Water level drops, fill valve kicks on. Wastes hundreds of gallons per month. One of the easiest toilet repairs.

Gas water heater pilot light goes out repeatedly -- caused by a failed thermocouple, dirty pilot orifice, drafts, or a failing gas valve.

Lights but will not stay lit? Almost always the thermocouple -- a safety sensor that detects the pilot flame. When it fails, the gas valve shuts off. Straightforward DIY repair, under $25.

Tiny holes from the inside out due to pitting corrosion. Start as small drips or green stains. One is a repair. Multiple are a warning that the entire system may be deteriorating.

Water pressure above 80 PSI throughout the house -- caused by a failed pressure reducing valve that no longer regulates incoming municipal pressure.

Failing PRV lets dangerously high pressure into the house. Bursts supply lines, damages appliances, causes hammer, shortens fixture life, leaks everywhere. Normal is 40-60 PSI. Above 80 is dangerous and needs immediate attention.

Hot water smells like rotten eggs or sulfur -- caused by sulfate-reducing bacteria reacting with the magnesium anode rod inside the tank.

Brown or rusty water? Could be corroding pipes, deteriorating heater tank, depleted anode rod, or a municipal main disturbance. First step: hot only, cold only, or both? That narrows the source immediately.

Rotten or sewage odor from under the kitchen or bathroom sink -- caused by a dry P-trap, leaking drain connection, missing cleanout cap, or venting issue.

Rotten or sewage odor near the toilet -- caused by a failed wax ring, dry trap, cracked flange, or blocked vent pipe allowing sewer gas into the bathroom.

Scalding hot or ice cold without touching the handle? Failing pressure-balancing cartridge, competing water demand, or a heater issue. Replacing the cartridge is the most common fix.

Shower head drips constantly after turning it off -- caused by a worn cartridge, failed valve seat, or a faulty diverter that does not fully close.

Foul smell from the drain? Bacterial biofilm in the pipe, dried-out P-trap letting sewer gas through, or food debris in the disposal or overflow. Most drain odors fixed in under 30 minutes with household items.

Kitchen or bathroom sink takes minutes to drain instead of seconds -- caused by buildup in the P-trap, clogged pop-up assembly, or partial blockage in the branch drain line.

Almost always a partial clog from hair, soap scum, grease, or food debris in the drain, P-trap, or branch line. Simple DIY fix, under 30 minutes.

No flow, weak flow, or will not switch modes? Clogged diverter valve, kinked hose, mineral buildup in the head, or cracked hose. Diverter is the most overlooked cause and the most common fix.

Popping, rumbling, crackling, hissing? Almost always sediment buildup. Water trapped under the layer superheats and steam bubbles pop as they escape. Warning sign that the heater is overworked and maintenance is overdue.

Usually discovered during an emergency -- something is leaking and the valve will not budge. Older gate valves seize after years of disuse. Fix ranges from penetrating oil and patience to full replacement.

Runs non-stop or cycles every few minutes? Will burn out prematurely. Stuck float, missing check valve, undersized pump, or high water table. Each has a different fix.

Sump pump turns on and off every few seconds or minutes instead of running a normal cycle -- caused by a stuck float switch, check valve failure, or undersized pit.

Basement flooding emergency waiting to happen. Usually electrical (tripped breaker, unplugged cord, GFCI), mechanical (stuck float), or burned-out motor. Diagnosing takes minutes and prevents thousands in water damage.

Your tankless water heater displays an error code and stops heating -- common codes for Rinnai, Navien, Noritz, and Rheem with causes and fixes.

Water level in the toilet bowl drops between flushes without anyone using it -- caused by a slow siphon effect, cracked bowl, or evaporation in unused toilets.

Tank takes 3-5 minutes to refill instead of the normal 60-90 seconds -- caused by a clogged fill valve, partially closed supply valve, or low water pressure.

Toilet makes gurgling, bubbling, or percolating sounds after flushing or when other fixtures drain. Usually a venting issue or partial drain blockage.

One of the biggest water wasters in a home. Water flows continuously into the bowl or overflows inside the tank. Worn flapper, faulty fill valve, or float set too high. 200+ gallons per day wasted.

Water pooling at the base usually means a failed wax ring. Left unaddressed: sewer gas in the home, subfloor rot, mold, and structural damage beneath the floor.

Water rises to the rim or spills over after flushing -- caused by a full clog in the trap or drain line that prevents the bowl from draining.

Water dripping from the braided hose or chrome tube between the wall shut-off valve and the toilet fill valve -- caused by loose connections, worn washers, or a cracked line.

Toilet rocks or wobbles after new tile, LVP, or hardwood was installed -- the floor is now higher than the flange, creating an unstable base and potential wax ring failure.

Toilet flushes but does not clear the bowl completely -- waste stays behind, water swirls weakly, or the siphon never fully engages.

Weak flush, incomplete, or multiple flushes to clear? Tank water level too low, clogged rim holes, flapper closing too fast, or partial clog in the trap or drain.

Loud banging when a valve closes suddenly. Shockwave can damage pipes, loosen fittings, and stress connections. Fix: hammer arrestors, recharge air chambers, or reduce pressure.

Popping, rumbling, cracking, or kettling sounds from your water heater -- caused by sediment buildup trapping water under hot deposits at the bottom of the tank.

Warm but not hot enough -- different from no hot water. Heater is working but something prevents it from reaching or holding temperature. Thermostat too low, sediment insulating the element, failing element, or undersized unit.