Few plumbing problems are as stressful as a clogged toilet—especially when it keeps happening. If you’re plunging your toilet more than once a month, there’s likely an underlying issue that a plunger alone won’t solve.
At Plumber Upland, we see recurring toilet clogs every week in homes across the Upland area. In most cases, the cause goes deeper than you’d expect. Here’s what’s likely behind your clogged toilet and what you can do to fix it for good.
Top Reasons Your Toilet Keeps Clogging
Too Much Toilet Paper
Using excessive amounts of toilet paper—or using thick, multi-ply brands—is the single most common cause of recurring toilet clogs. Thick paper doesn’t dissolve as quickly and can bunch up in the trapway, especially in older low-flow toilets. Try reducing the amount per flush or switching to a rapid-dissolve toilet paper.
An Older, Low-Flow Toilet
Many Upland homes built in the 1990s and early 2000s were equipped with first-generation low-flow toilets. While designed to conserve water, these early models often lack the flushing power needed to clear waste effectively. If your toilet has a 1.6-gallon flush rating and clogs frequently, upgrading to a modern high-efficiency toilet can solve the problem permanently.
A Partial Blockage in the Drain Line
Sometimes the clog isn’t in the toilet itself—it’s deeper in the drain line. A partial blockage caused by mineral buildup, grease, or foreign objects can restrict flow just enough to cause recurring issues. This is especially common in homes with older cast-iron or galvanized drain pipes.
Flushing Non-Flushable Items
Despite what the packaging says, items like “flushable” wipes, cotton swabs, feminine hygiene products, and dental floss do not break down in your pipes the way toilet paper does. These items accumulate over time and create stubborn blockages that worsen with every flush.
Tree Root Intrusion
If your toilet clogs frequently and you’ve also noticed slow drains elsewhere in your home, tree roots may have infiltrated your sewer line. Roots are naturally attracted to the moisture inside sewer pipes and can enter through tiny cracks or joints. Once inside, they grow and create major blockages that affect every drain in your house.
A Blocked Plumbing Vent
Your plumbing system relies on vent pipes—usually extending through your roof—to allow air into the drain system and maintain proper pressure for flushing. If a vent becomes blocked by debris, bird nests, or leaves, your toilet may flush weakly or not at all, leading to repeated clogs.
How to Fix a Clogged Toilet That Keeps Coming Back
Start with a quality flange plunger—the type with an extended rubber flap that fits into the toilet’s trapway for a better seal. If plunging doesn’t resolve the issue, a toilet auger (closet auger) can reach deeper into the trapway to clear obstructions without scratching the porcelain.
If the clog returns within days or weeks, the problem is almost certainly beyond the toilet itself. At that point, a professional camera inspection is the most effective way to identify exactly what’s causing the blockage. Plumber Upland’s team will send a high-definition camera through your drain line to locate the obstruction, then recommend the most effective and cost-efficient repair—whether that’s hydro-jetting, root removal, or a targeted pipe repair.
When to Replace Your Toilet
If your toilet is more than 15 to 20 years old and clogs regularly, replacement is often more cost-effective than repeated repairs. Modern toilets use as little as 1.28 gallons per flush while delivering significantly more flushing power than older models. Plumber Upland can help you choose the right toilet for your home, remove the old unit, and install the new one—all in a single visit.
Stop the Cycle of Clogged Toilets
A toilet that clogs once in a while is normal. A toilet that clogs every week is telling you something. Don’t ignore the warning signs—the longer you wait, the more likely a small issue will turn into a major sewer line problem.