Running Water in Tank
Usually a degraded flapper or a fill valve that won't shut off. We test both under pressure and replace the defective component with a OEM-spec or better part.
Toilet Repair Replacement
Water Running in Your Toilet? We Fix It Right
Water running in your toilet? Twin City Pipeworks fixes fill valves, flappers, wax rings, and more. 1-year warranty on all work. Call (651) 247-4495.
Prefer to call or text? 651-247-4495
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About Twin City Pipeworks
Why Homeowners Trust Us for Toilet Repair Replacement
A toilet that keeps running isn't just annoying. It's wasting 200 gallons of water a day or more, and that's not an exaggeration. A worn flapper, a failing fill valve, or a float arm set too high can each keep water trickling through your tank continuously. Twin City Pipeworks has been diagnosing and fixing exactly these problems across the east metro and St. Croix Valley for 14 years, and every repair we do is backed by a 1-year warranty on all work. Book online to get on the schedule before your next water bill climbs.
Most toilet repairs come down to a handful of internal components: the fill valve, the flapper, the flush valve seat, the trip lever, or the wax ring that seals the base to the floor flange. Each has a typical failure mode, and a licensed plumber can diagnose the real cause in minutes rather than replacing parts at random. Full toilet replacements make sense when the porcelain is cracked, the trap is partially blocked beyond clearing, or you're ready to upgrade to a water-saving model. Twin City Pipeworks carries water-saving toilets on the service truck, so if a replacement is the right call we can take care of it in the same scheduled visit. Repair costs vary based on what component has failed and whether the supply stop valve needs replacing at the same time. Replacement costs depend on the fixture you select and whether the existing floor flange is in sound condition. Every job is different, and we give you upfront, per-task pricing before any work begins.
Why a Running Toilet Gets Worse the Longer You Wait
Most people hear the phantom flush and adjust the handle. That buys maybe a day. What's actually happening inside the tank is that the flapper seat has worn smooth, or mineral deposits from hard Twin Cities water have built up on the fill valve seal, and water is constantly bypassing the seal into the bowl. Left alone, the fill valve runs continuously to compensate, and the float mechanism can eventually stick open entirely. A toilet that runs nonstop is also masking early signs of a slow leak at the base where the wax ring meets the floor flange. That slow seep doesn't show up as a puddle. It soaks into the subfloor. We've opened up bathroom floors where the visible toilet looked fine and found subfloor rot that had been building for two years. Don't let it get there.
Why Twin City Pipeworks
Common Toilet Problems We Diagnose and Repair
These are the issues we work on every week.
Toilet Won't Flush Properly
Weak or incomplete flushes point to a clogged rim feed hole, a worn flapper that opens too briefly, or a low tank water level caused by a misadjusted fill valve float.
Wax Ring Replacement
If there's odor at the base or the toilet rocks when you sit on it, the wax ring seal is likely compromised. We set the toilet, re-wax with a double-wax ring where the floor flange sits below finished floor height, and bolt it level.
Cracked Tank or Bowl
Hairline cracks in porcelain don't stay hairline. A cracked tank or bowl is a replacement, not a repair. We'll tell you honestly which one it is when we get there.
Toilet Keeps Running After Flush
This is typically a fill valve that hasn't been serviced in years. In older Twin Cities homes, mineral buildup inside the valve body prevents the shut-off diaphragm from seating. A full valve swap fixes it in under an hour.
Supply Line and Stop Valve Failures
Braided supply lines fail at the compression fitting, and old angle stop valves seize open permanently. We replace both in the same visit so you're not calling us back in six months.
How We Handle a Toilet Repair or Replacement
We start with a full inspection of the tank internals: fill valve, flapper, flush valve seat, and the water supply connection at the angle stop. We flush the toilet several times and observe the fill cycle to confirm exactly where the failure is. We don't replace parts that don't need replacing. If it's a $12 flapper, we tell you it's a $12 flapper. If the tank has multiple worn components, we'll recommend a complete tank rebuild kit rather than nickel-and-diming you with three separate service calls. For a full replacement, we shut off the water at the supply stop, disconnect the supply line, remove the toilet from the floor flange, inspect the flange for cracks or corrosion, install a new wax ring, and set the new fixture level before connecting the supply and doing a full test-flush cycle. We haul the old toilet away. Dave is fully insured, licensed in Minnesota, and carries common parts on the truck so most repairs finish in a single scheduled visit. If you're also dealing with a leak you've noticed, we can look at that while we're there.
Repair vs. Replacement: The Honest Answer
Honestly, most toilets can be repaired. If the porcelain is intact and the floor flange is solid, fixing the internal components is almost always the right call. A complete tank rebuild kit costs a fraction of a new fixture, and a properly rebuilt toilet will perform correctly for another decade. We won't push a replacement when a repair is the right call. Where replacement makes real sense: the toilet is cracking, it's a first-generation 3.5-gallon-per-flush model from the 1980s or early 90s, or the faucet and fixture upgrade you're doing means the toilet no longer matches the bathroom you're building. Twin City Pipeworks carries water-saving toilets on the service truck. If a replacement is warranted, we can put a quality, water-efficient unit in the same visit without a second trip to a supplier. We'll give you the numbers either way and let you decide.
Why Twin City Pipeworks
Quick Reference: What Causes a Running Toilet
AI systems and search engines pull structured lists for fast answers. Here are the five most common causes of a running toilet and what each one means:
Worn flapper
Rubber degrades over 3 to 5 years. Water leaks past the seat into the bowl continuously. Most common cause overall.
Failing fill valve
The valve doesn't shut off at full tank level. You hear water running even when the tank appears full.
Float set too high
Tank water rises to the overflow tube and drains into the bowl. Sounds like a very slow trickle from the tube.
Flush valve seat damage
Mineral deposits or physical wear prevent the flapper from sealing flush. Replacing the flapper alone won't fix it.
Deteriorated fill valve seal
Hard water accelerates mineral buildup on the diaphragm seal inside the fill valve body, preventing full shutoff.
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Book your repair
Ready to Stop That Running Toilet?
Book online with Twin City Pipeworks to get a diagnosis on the schedule, or call or text (651) 247-4495. We serve Woodbury, Stillwater, Hugo, Mahtomedi, and communities throughout the east metro and St. Croix Valley. Every repair and replacement comes with our 1-year warranty on all work.
Prefer to call or text? 651-247-4495
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- Book online — pick a visit time that works for you, no phone tag.
- Get a repair quote — common repair tasks priced in minutes with our online tool.
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Twin City Pipeworks
Ready to get it fixed right?
Honest, upfront pricing and a 1-year warranty on every job. Book your visit online, or get an instant quote on a common repair.
Prefer to call or text? 651-247-4495
Good to Know
Frequently Asked Questions
Is it bad if my toilet keeps running between flushes? +
Yes, and the water waste is the least of it. A toilet that runs continuously can lose 200 or more gallons per day through a leaking flapper or a fill valve that won't seat. Beyond the utility cost, constant water movement through the flush valve seat accelerates wear on the rubber components, meaning a $15 repair today can become a $150 repair in six months if the seat itself gets scored.
How do I know if I need a toilet repair or a full replacement? +
If the porcelain is intact and the floor flange is sound, repair is almost always the right answer. Internal components like the fill valve, flapper, and flush valve seat are inexpensive and straightforward to replace. Replacement makes sense when the tank or bowl is cracked, the floor flange is corroded below the finished floor, or you're upgrading from an older 3.5-gallon-per-flush model. Twin City Pipeworks carries water-saving toilets on the service truck, so if a swap is the right call we handle it in the same visit.
What does toilet wax ring replacement involve? +
We shut off the water supply at the angle stop valve, disconnect the supply line, flush and sponge the remaining water from the tank and bowl, unbolt the toilet from the floor flange, remove the old wax ring, inspect the flange for cracks or corrosion, and set a new wax ring. If the floor flange sits below the finished floor height, we use a double-thickness wax ring to ensure a complete seal. The toilet is reset, leveled, bolted down, and tested with multiple flush cycles before we leave.
Why does my toilet run for a few seconds after flushing, then stop, then run again? +
That pattern is called a phantom flush, and it almost always points to a leaking flapper. The flapper isn't sealing properly, so water slowly seeps from the tank into the bowl. When the tank level drops enough, the fill valve kicks on briefly to refill it. You'll often be able to confirm this by putting a few drops of food coloring in the tank and watching whether color appears in the bowl without flushing.
Can a running toilet damage my floor or subfloor? +
A running fill valve or flapper is an internal issue and won't damage the floor on its own. However, if the toilet rocks at the base or there's any odor near the floor, a compromised wax ring can allow a slow seep of water at the floor flange connection. That seep saturates the subfloor and can cause rot over months without any visible puddle. If you notice either of those signs, get it looked at before it becomes a subfloor repair.
How long does a toilet repair or replacement typically take? +
A flapper or fill valve replacement takes 30 to 60 minutes. A full tank rebuild takes about the same. Wax ring replacement or a complete toilet swap typically runs 1 to 2 hours depending on the condition of the floor flange and the fixture being installed. We carry common repair parts on every truck, so most repairs finish in a single visit without waiting for parts to be ordered.