Drains & Sewers
Why Your Drains Keep Clogging (and How to Stop It)
By Riverside Plumbing Pros·February 25, 20266 min read
If you're plunging the same drain every few weeks, the problem isn't the clog — it's what keeps causing it. Here's how to break the cycle.
There's a difference between a one-time clog and a drain that keeps clogging. The first is bad luck. The second is a symptom — something in the line is causing it to happen again and again, and clearing it repeatedly just treats the symptom while the cause stays put. Here's what's usually behind a recurring clog and how to actually stop it.
Grease in the kitchen line
The number-one cause of recurring kitchen clogs is grease. Even when you pour it down with hot water, it cools and congeals on the pipe walls downstream, narrowing the line a little more each time until it clogs again. Cabling punches a hole through it, but the coating stays. Hydro jetting — high-pressure water that scours the entire pipe wall — is what actually removes grease buildup and buys you real time.
Tree roots in the main line
If it's your main line backing up repeatedly, roots are the prime suspect, especially in Riverside's older neighborhoods with mature trees. Roots find their way into tiny cracks and joints in the sewer lateral and grow into a mesh that catches everything. You can't fix this with cleaning alone — it needs a camera inspection to confirm, then jetting plus a repair or lining to keep the roots out.
Hard-water scale
Riverside's 12-grain hard water leaves mineral scale inside pipes over the years, gradually reducing their diameter. In older galvanized lines especially, scale and corrosion narrow the pipe from the inside until flow suffers and clogs become routine. This is often a sign the piping itself is near the end of its life.
A damaged or bellied line
Sometimes the pipe has a low spot (a 'belly'), an offset joint, or a partial collapse that catches debris every time. Water and waste pool there, and no amount of cleaning changes the shape of the pipe. Again, this is a camera-inspection finding — you can see the belly or offset on the footage.
How to break the cycle
- For kitchen grease: hydro jetting, plus keeping grease out of the drain going forward
- For roots: camera inspection, jetting, and a spot repair or pipe lining
- For scale in old pipe: consider repiping and a whole-house softener
- For a bellied or damaged line: a targeted repair of the affected section
One thing to avoid
Please don't lean on chemical drain cleaners as a routine fix. They rarely clear a real blockage, they can damage older pipes, and their residue is a hazard for whoever works on the line next. If you've used one, just let us know so we can work safely.
Written by the licensed team at Riverside Plumbing Pros. Call (831) 290-4327 for help with any of the issues below.
From our licensed plumbers
The difference between clearing a clog and fixing it
A cable machine punches a hole through a blockage and restores flow, which feels like a fix but often isn't. In a grease-fouled kitchen line, the cable bores a channel through the buildup and leaves the coated pipe walls behind, so the line re-narrows and clogs again within weeks. Hydro jetting is different: it scours the full pipe diameter back to bare wall, which is why it lasts far longer on grease and light root intrusion. Choosing between them isn't about upselling — it's about matching the tool to what's actually in the pipe.
When a clog keeps returning, the honest next step is a camera, not a third cable pass. The footage tells us whether we're looking at grease, a root mass at a joint, a bellied section that pools water, or scale in an aging line — four problems with four different fixes. Paying once to see the cause is almost always cheaper than paying repeatedly to treat the symptom, and it stops the cycle of 'cleared last month, clogged again' that so many homeowners get stuck in.
Frequently asked questions
Because clearing treats the symptom, not the cause. Grease coating, tree roots, scale, or a bellied pipe keep re-clogging the line. A camera inspection identifies which, so the fix actually lasts.
For grease and scale, yes. A snake punches through a blockage; jetting scours the whole pipe wall clean, which is why it lasts far longer on lines that keep clogging.
Chemical cleaners rarely clear a real blockage and can damage older pipes, and their residue is a hazard for whoever services the line next. Enzyme maintenance products are gentler for routine upkeep, but neither replaces clearing the actual cause when a drain keeps clogging.
