10 Most Common Plumbing Problems in San Diego Homes and How To Fix Them
Every homeowner deals with plumbing problems. Some are minor annoyances you can handle yourself in 10 minutes. Others look minor but signal something more serious developing inside your walls or beneath your foundation. This guide covers the 10 most common plumbing issues we see throughout San Diego and North County — what causes them, what you can do yourself, and when it is time to call a professional.
Table of Contents:
- Dripping Faucets
- Running Toilets
- Slow Drains
- Low Water Pressure
- No Hot Water
- Leaky Pipes Under Sinks
- Clogged Garbage Disposal
- Toilet Keeps Clogging
- Water Heater Making Noise
- Sewer Smell Inside the Home
- FAQ
1. Dripping Faucets
What Causes It: Worn cartridges, O-rings, or washers inside the faucet body. Every faucet has internal seals that degrade over time from constant use and mineral exposure.
What You Can Do: Most faucet drips are DIY-fixable with a replacement cartridge from a hardware store. Turn off the supply valve under the sink first.
When To Call a Plumber: If the drip returns after a cartridge replacement, the faucet body itself may be corroded and the unit needs replacement.
2. Running Toilets
What Causes It: A faulty flapper valve that does not seal properly, allowing tank water to continuously drain into the bowl. Sometimes caused by a misadjusted float or fill valve.
What You Can Do: Replace the flapper — a $5 to $10 part available at any hardware store. It is one of the easiest plumbing fixes a homeowner can make.
When To Call a Plumber: If a new flapper does not solve the problem, the flush valve seat may be damaged or the fill valve may need replacement — both are quick professional repairs.
3. Slow Drains
What Causes It: Hair, soap scum, grease, and debris accumulating inside the drain pipe over time. In older San Diego homes with smaller diameter pipes, buildup happens faster.
What You Can Do: A drain snake or plunger handles most minor clogs. A mixture of baking soda and vinegar followed by hot water helps with mild grease buildup.
When To Call a Plumber: Multiple slow drains throughout the house simultaneously indicate a main line issue — not individual fixture clogs. This requires professional snaking or hydro jetting.
4. Low Water Pressure
What Causes It: Mineral buildup inside pipes, a failing pressure regulator, a partially closed shutoff valve, or a hidden leak diverting flow away from fixtures.
What You Can Do: Clean faucet aerators and showerheads — mineral buildup in these small screens dramatically reduces apparent pressure. Also check that all shutoff valves are fully open.
When To Call a Plumber: If cleaning aerators does not resolve the issue, the cause is inside the pipe system and requires professional diagnosis.
5. No Hot Water
What Causes It: Water heater failure, tripped circuit breaker on electric units, pilot light out on gas units, or a failed thermostat or heating element.
What You Can Do: Check the circuit breaker for electric heaters. Relight the pilot on gas units following the manufacturer instructions on the unit label.
When To Call a Plumber: Any water heater issue that is not resolved by a breaker reset or pilot relight requires professional service. Do not attempt to repair gas components yourself.
H2: 6. Leaky Pipes Under Sinks
What Causes It: Loose slip joint connections, worn drain washers, or corroded pipe sections. Very common in older San Diego homes with original drain plumbing.
What You Can Do: Tighten slip joint nuts by hand first — overtightening can crack plastic fittings. Replace worn washers if tightening does not stop the drip.
When To Call a Plumber: Corroded metal drain pipes need replacement. Leaks at supply line connections to shut-off valves should always be handled by a plumber.
H2: 7. Clogged Garbage Disposal
What Causes It: Overloading the disposal, putting inappropriate items in it (grease, fibrous vegetables, bones), or simply age-related decline in motor performance.
What You Can Do: Press the reset button on the bottom of the disposal. Use the hex key in the center port to manually free a jammed grinding plate. Never put your hand inside.
When To Call a Plumber: If resetting and manual freeing do not work, the motor or grinding assembly may have failed and the unit needs replacement.
H2: 8. Toilet Keeps Clogging
What Causes It: Low-flow toilets with inadequate flush volume, partial blockages deeper in the drain line, or tree root intrusion into the sewer line — very common in established San Diego neighborhoods.
What You Can Do: A plunger handles most surface-level toilet clogs. Use a flange plunger specifically designed for toilets rather than a cup plunger.
When To Call a Plumber: Toilets that clog repeatedly despite plunging, or multiple toilets clogging simultaneously, indicate a main sewer line problem that requires camera inspection and professional clearing.
H2: 9. Water Heater Making Noise
What Causes It: Sediment accumulation at the bottom of the tank. San Diego’s hard water deposits minerals inside the tank over time and when the heating element fires, the water trapped in the sediment layer pops and rumbles.
What You Can Do: Annual tank flushing prevents sediment accumulation. If your heater is already loud, a professional flush may help but significant buildup can be permanent.
When To Call a Plumber: Banging or rumbling water heaters are often near the end of their useful life. Have a plumber assess whether flushing is sufficient or replacement is the smarter investment.
H2: 10. Sewer Smell Inside the Home
What Causes It: Dried P-traps in rarely used fixtures, cracked vent pipes, loose wax ring seals at toilet bases, or in serious cases a cracked sewer line beneath the home.
What You Can Do: Run water in all rarely used fixtures — guest bathrooms, utility sinks, floor drains — to refill evaporated P-traps. This solves the problem in many cases within minutes.
When To Call a Plumber: If running all fixtures does not eliminate the smell, or if the odor is strong and persistent in a specific location, a cracked drain line or failed wax ring needs professional attention immediately.
Frequently Asked Questions
Which plumbing problems can I fix myself?
Dripping faucets, running toilets, minor drain clogs, and clogged disposals are reasonable DIY projects for handy homeowners. Anything involving supply lines, gas connections, or main sewer lines should be handled professionally.
Multiple affected fixtures, sewage odors, water staining on ceilings or walls, and unexplained water bill increases are all signs that a problem goes beyond a simple surface fix.
Low water pressure caused by mineral buildup in aging pipes is the most common chronic issue we see in pre-1990 North County homes.
Immediately. Even small leaks cause cumulative damage that grows significantly over days and weeks. There is no such thing as a leak that is safe to ignore.
Yes. San Diego’s municipal water has significant mineral content that deposits inside pipes, water heaters, and fixtures over time. This is a real contributing factor to the plumbing issues common throughout North County.