10 Most Common Plumbing Issues

Updated: 12/02/2025

Nothing derails your day faster than an unexpected plumbing issue. Whether you’re in Los Angeles, Santa Monica, or elsewhere in Southern California, even a small problem—slow showers, dripping faucets, or an overflowing toilet—can bring everything to a halt.
You can take DIY steps to help minimize damage—or reach out to a qualified local plumber when the situation calls for expert help.

Discover 10 common plumbing issues homeowners and renters face, what you can do to fix the problem, and when it’s time to bring in a professional.

1. Clogged Drains and Slow-Moving Sinks

If your sink backs up or water pools in the shower, you’re probably dealing with a clogged pipe. Hair, soap buildup, and grease are the most common offenders.

Try these tips to fix a clogged drain:

• Remove visible debris from the drain opening.
• Pour hot (not boiling) water to loosen buildup.
• Try a baking soda and vinegar flush.
• Use a plunger or a small drain snake.
• Avoid using chemical drain cleaners, as they can weaken older pipes.

If nothing gets the water moving again, you may be dealing with a more serious issue, such as roots in the line or a developing mainline clog. A plumber can perform a camera inspection to identify the problem and stop it from turning into a full backup.

2. Leaking Pipes Behind Walls and Under Sinks

Pipe leaks in SoCal homes often hide behind walls, under sinks, or beneath slab foundations—showing up as damp spots, musty odors, or sudden spikes in your water bill. Temperature swings, aging lines, and high water pressure are common triggers.

Do the following to address a leak:

• Shut off the water to the area or the whole house.
• Dry the surrounding area and place a bucket or towel underneath.
• Look for visible signs of pipe corrosion, like discoloration or flaking metal.
• Reduce water pressure if it’s unusually high (above 80 PSI).

If you’re unsure what you’re dealing with, a qualified SoCal plumber can inspect the issue and recommend the appropriate repair.

3. Running Toilets and Constant Tank Cycling

A toilet that won’t stop cycling can waste 20,000 to 30,000 gallons per month. In most cases, this problem is a mechanical issue due to a worn flapper, a misaligned chain, or a faulty fill valve.

What to do if your toilet keeps running:

• Remove the tank lid and check that the flapper seals properly.
• Adjust the chain so it has a bit of slack and moves freely.
• Ensure the float is set to the correct height.
• Replace inexpensive parts if they look worn or cracked.

For tankless models that feature electronic ignition or flow sensors, you may need a technician to reset or replace the affected component.

4. Low Water Pressure Throughout the Home

Weak water flow can make everyday tasks frustrating, from showering to washing dishes. It often indicates mineral buildup, a faulty fixture, or a supply issue that requires attention.

To understand what’s causing low water pressure in your home:

• Clean faucet aerators and showerheads.
• Inspect for leaks under sinks or outdoors.
• Check your home’s pressure regulator.
• Ask neighbors if they’re experiencing similar issues (could be a municipal problem).

If pressure drops suddenly or leaks accompany the issue, call a plumber immediately.

5. Water Heater Issues and Sudden Loss of Hot Water

Hot water trouble tends to appear out of nowhere. If you’re experiencing inconsistent temperatures, no hot water at all, or strange rumbling sounds, a few simple checks can help you determine why your water heater is not working.

Start with these steps:

• Check whether the pilot light is on (for gas units).
• Reset the breaker for electric heaters.
• Look for leaks around the tank.
• Listen for popping or rumbling noises that indicate sediment buildup.
• Ensure temperature settings are around 120°F.

Water heaters involve multiple safety-sensitive components, including gas lines, electrical connections, and pressurized tanks. If you’re unable to resolve the issue, hire a professional to inspect it.

6. Sewer Line Backups and Whole-House Drain Slowdowns

Slow drains in every room? Odd smells? Toilets gurgling? Those are classic signs of a sewer line problem. Older areas in LA and Pasadena—with aging clay and cast-iron pipes—tend to experience these issues more often.

Look for these sewer backup signs so you can address the issue before it gets worse:

• Watch for multiple drains slowing down at once.
• Check for water collecting around floor drains.
• Note any sewage odors, both inside and outside the home.
• Stop running water until the line can be inspected.

Sewer issues can escalate quickly and pose serious contamination risks. If you notice any warning signs, call a professional who has the equipment to clear the line safely.

7. Slab Leaks Beneath Your Foundation

Earthquake activity, aging copper pipes, and high water pressure are contributing factors to slab leaks in California homes. When the line breaks, water spreads through the concrete and can cause costly structural damage if ignored.

Signs of a slack leak include:

• Unexplained warm spots on floors.
• Rising water bills without obvious leaks.
• Hissing or running water sounds when fixtures are off.
• Cracks in the flooring or areas of damp carpet.

Once you spot these signs, getting the line tested prevents the issue from spreading under the foundation.

8. Gas Line Odors and Safety Concerns

A gas odor (often a strong sulfur or “rotten egg” scent) near appliances, water heaters, or outdoors around the meter is an emergency. Knowing what a gas line smells like and what to do can protect your home.

Take these steps immediately:

• Leave the home—don’t flip switches or use electronics.
• Shut off the gas at the main valve only if safe to do so.
• Call the gas company from outside the home.
• Contact a licensed plumber for repair once the area is cleared.

Do not attempt to repair a gas line under any circumstances. This is an emergency and must be handled by qualified professionals.

9. Burst or Temperature-Damaged Pipes

Although freezing is less common in coastal Southern California, temperature drops in the foothills and valleys can cause pipes to burst. When a pipe ruptures, water releases quickly and needs immediate attention.

Here’s how to stabilize the situation until help arrives:

• Shut off your home’s main water valve.
• Turn on faucets to relieve pressure.
• Move electronics or valuables away from the affected area.
• Start drying with towels or fans.

Immediate help from a professional is essential to minimize structural damage.

10. Aging or Corroded Pipes Reaching the End of Their Lifespan

Older SoCal homes often have galvanized or aging copper pipes that deteriorate over time. Corrosion, mineral buildup, and thinning walls can cause recurring leaks or noticeable changes in water quality.

If you suspect older pipes are causing issues:

• Watch for discolored water or metallic tastes.
• Inspect exposed pipes for rust or pitting.
• Note recurring leaks in the same area.
• Consider repiping if your home is 40 years old or older.

Upgrading old pipes means improved water flow, reduced need for repairs, and protection against hidden damage.

How To Prevent Plumbing Issues

Whether you live in a historic LA craftsman or a modern condo, routine maintenance can help reduce many of the most common issues homeowners face.

Use these preventive steps to keep your plumbing in good shape:

• Clean aerators twice a year.
• Flush your water heater annually.
• Avoid flushing wipes or hygiene products.
• Don’t pour grease or coffee grounds down the sink.
• Schedule routine inspections, especially for older homes, to ensure their safety and maintenance.
• Use strainers in bathroom drains.

These habits go a long way in reducing future plumbing emergencies and can extend the lifespan of your system.

Get Fast, Professional Plumbing for Your SoCal Property

Drips, clogs, sewer trouble—no matter the issue, a reliable local plumber can restore your home’s safety and comfort.

Ritz Plumbing provides accurate diagnostics of plumbing problems and offers solutions, preventing minor issues from escalating into costly damage.

Contact us to schedule an inspection or repair and get fast, dependable service you can count on.

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