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Drain Cleaning

5 Signs Your Drains Need Cleaning (Don't Ignore #4)

March 18, 2026·5 min read·Upland, CA

Drains do not clog overnight. They give you warning signs weeks or even months before they fully back up. The homeowners who catch these signs early spend $150 on a drain cleaning. The ones who ignore them spend $1,500 on emergency service and water damage repair.

Here are the five signs every Inland Empire homeowner should watch for.

Sign 1: Slow Draining

This is the most obvious sign and the one most people ignore the longest. If water is pooling around your feet in the shower or your kitchen sink takes a minute to empty after doing dishes, you have buildup forming inside the pipe.

One fixture vs. multiple: If only one drain is slow, the clog is probably in that specific drain line — hair in the shower, grease in the kitchen. If multiple fixtures are slow, the problem is deeper in your main sewer line. That is a bigger deal and needs professional attention.

Sign 2: Gurgling Sounds

When you hear your toilet gurgle after running the bathroom sink, or your kitchen drain makes bubbling sounds, that is air trapped in your plumbing system. It means water is having to push past a partial blockage, displacing air as it goes.

Gurgling often indicates a developing clog in the main line or a venting issue. Either way, it is not normal and it is not going to fix itself.

Sign 3: Bad Odors From Drains

If your drains smell like sewage, rotting food, or something musty, you have biofilm buildup inside the pipes. Biofilm is a layer of bacteria, grease, soap scum, and organic matter that coats the inside of drain pipes over time.

This is not just a smell problem. Biofilm narrows the pipe diameter and provides a sticky surface for hair, food particles, and other debris to catch on. It is the foundation of most drain clogs.

Sign 4: Multiple Drains Clogged at Once

This is the big one. If your shower, toilet, and kitchen sink all start draining slowly around the same time, your main sewer line is partially blocked. This is not something a plunger or bottle of Drano can fix.

Main line clogs are typically caused by tree root intrusion, accumulated grease and scale, or a belly (sag) in the pipe where debris collects. In the Inland Empire, mature trees in older Ontario and Fontana neighborhoods are notorious for sending roots into sewer lines through tiny pipe joints.

If you are seeing multiple slow drains, call a plumber before it becomes a full sewage backup. A camera inspection can pinpoint exactly what is going on.

Sign 5: Water Backing Up in Unexpected Places

The strangest sign is also the most telling. If water comes up in your shower when you flush the toilet, or your washing machine drains and water appears in the bathtub, your main line is blocked and water is finding the path of least resistance.

This is a sewage backup waiting to happen. Do not run any more water until a plumber clears the line.

DIY vs. Professional

A plunger works for simple toilet clogs and minor sink blockages. A drain snake from the hardware store can handle basic clogs close to the drain opening.

Beyond that, call a professional. Store-bought chemical drain cleaners contain sodium hydroxide or sulfuric acid that can damage older cast iron and galvanized steel pipes — common in Inland Empire homes built before the 1980s.

Professional drain cleaning with snaking or hydrojetting gets to the root cause. Hydrojetting completely scours the pipe walls clean, removing years of buildup and leaving your drains flowing like new.

Regal Plumbing & Rooter provides same-day drain cleaning across the Inland Empire — Ontario, Rancho Cucamonga, Fontana, Pomona, Corona, Upland, West Covina, and Chino. Call (909) 600-4561.

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