In times of economic uncertainty and tighter budgets, an unexpectedly high water bill can be a frustrating surprise. Because water bills are often issued quarterly, even small, unnoticed leaks can lead to significant increases in your costs. To avoid these surprises, it’s important to inspect your plumbing fixtures regularly and ensure water isn’t being wasted. In this article, we’ll highlight some of the most common causes of plumbing leaks and how to fix them.
Toilets
Toilets are a major source of hidden water leaks, often going unnoticed until they show up on a high water bill. The three main components responsible for these leaks are the flapper, flush valve, and fill valve.
The most common sign of a toilet leak is the sound of the fill valve running, either periodically or continuously.
1. Intermittent Filling
If the fill valve runs occasionally without flushing, the most likely culprits are the flapper, flush valve, or less commonly the refill tube.
- Flapper: Start by inspecting the flapper for wear, cracks, or warping. Replacing it is simple and inexpensive, often requiring no tools, just unhook it from the pivot points and detach the chain. While many toilets use universal flappers, some models require specific flappers due to the physical shape of the toilet or a water saving flush design.
- Flush Valve: If replacing the flapper doesn’t fix the issue, the next part to check is the flush valve, the seat the flapper seals against. It contains a gasket that seals against the tank and allows water to flow into the bowl. Look for worn gaskets or cracks in the plastic body or overflow tube. Replacing the flush valve is more involved and requires removing the tank from the bowl. These come in 2” or 3” sizes, with 3” becoming more popular with water conservation regulations becoming more strict. Flush valves can often be replaced with a generic version of the same size, but some models require specific flush valves.
- Refill Tube: This small rubber tube runs from the fill valve into the overflow riser. If it slips below the water line, it can create a siphon that drains the tank into the bowl. To fix it, re-secure the tube with its clip so it stays above the water level.
2. Constant Filling
If the fill valve never shuts off, the issue is usually internal to the fill valve:
- Worn parts or sediment: Internal seals can crack over time, or sediment buildup can prevent the valve from sealing. While some fill valves allow for gasket replacement, it’s often easiest to replace the entire unit.
- Float adjustment: As valves age, the float may not shut off the water at the proper level. If manually lifting the float stops the water, try adjusting the float using the valve’s built-in mechanism to lower the tank water level.
3. Visible Leaks
Other toilet leaks, such as from the tank-to-bowl gasket, tank-to-bowl bolts, supply line, or valve, are usually visible and quickly addressed, as they can cause water damage. These are less likely to cause a spike in your bill since they’re typically noticed and repaired promptly.
Faucets
A dripping faucet might seem harmless, after all, the water goes straight down the drain and doesn’t pose much risk of damage. But even a slow, steady drip can waste a surprising amount of water over time, leading to an unnecessarily high water bill.
Modern Faucets: Ceramic Disk Cartridges
Most modern faucets, whether single or two-handle designs, use ceramic disk cartridges to control water flow. These cartridges are typically not repairable and must be replaced when they fail. While some manufacturers use the same cartridge across their product line, others use model-specific parts, so keeping product literature or installation guides can be a big help in identifying the correct replacement.
Older Faucets: Washers and Seats
Older two-handle faucets often use rubber washers and brass seats. The washers are usually universal and easy to replace. However, if the seat is damaged, it must also be replaced, and those parts are often specific to the faucet brand or model.
Replacing Cartridges or Washers
To repair a leaking faucet:
- Turn off the water supply to the faucet.
- Remove the handle and trim to access the internal components.
- Unscrew the retaining nut that holds the cartridge or stem in place.
- Remove the old cartridge or washer assembly.
- Install the new part, secure it with the retaining nut, and test for leaks before reinstalling the trim.
Even though it’s easy to overlook a faucet drip, fixing it promptly can prevent gallons of water from going to waste, and help keep your utility bill in check.
Tub And Shower Valves
Like dripping faucets, tub and shower valve drips are easy to ignore because they don’t cause visible damage. However, they can waste a significant amount of water over time, quickly contributing to a high water bill.
Valve Types and Cartridges
Most modern shower valves use either pressure-balance or thermostatic cartridges to control water temperature and flow. While many manufacturers use the same cartridge design across multiple valve models, cartridges are not interchangeable between brands or valve types, so correctly identifying your valve is essential when sourcing a replacement.
As with faucet cartridges, shower cartridges are typically not repairable and must be replaced when worn or leaking. Keeping the original installation instructions or product literature makes identification much easier.
Replacing a Shower Cartridge
Replacing a shower valve cartridge is similar to replacing a faucet cartridge, but with a few important considerations:
- Turn off the water supply. In most homes, this means shutting off the main water supply. Some valves include integral shutoff stops, but you’ll need to remove the trim to check.
- Remove the trim and handle to access the cartridge.
- Locate and remove the retaining nut or clip holding the cartridge in place.
- Carefully pull out the old cartridge.
- Insert the new cartridge, making sure it is aligned correctly.
- Reinstall the retaining nut or clip, and test the valve for leaks and functionality before reinstalling the trim.
- Once you’re confident there are no leaks behind the wall, reinstall the trim and handle.
Outside Faucets
Outside faucet leaks can easily go unnoticed, especially if the faucet is hidden behind bushes or located in an infrequently used area. But just like indoor leaks, even a small drip can waste a surprising amount of water and lead to a high water bill.
Regular Inspection Is Key
Check outside faucets regularly, particularly those:
- Hidden from view
- Not used frequently
- Located far from daily activity
Catching a drip early can prevent wasted water and avoid costly surprises on your next bill.
Common Faucet Types & Repairs
- Traditional Multi-Turn Faucets
- These typically use a rubber washer to create a seal.
- Washers are easy to replace and available in generic sizes.
- Be cautious when removing the screw that holds the washer, it can be corroded and prone to stripping or breaking. If it snaps, the entire faucet may need replacing.
- ¼ Turn Faucets
- These may use a washer, ceramic disk cartridge, or ball valve.
- Ceramic disk cartridges require the correct manufacturer-specific replacement.
- Ball valve styles are not repairable, they must be replaced entirely.
- Frost-Free Faucets
- Common in colder climates, these are designed to prevent freezing.
- They can use either washers or ceramic disk cartridges.
- If it uses a cartridge, you’ll need to:
- Identify the manufacturer and cartridge type
- Determine the correct shank length, since the cartridge is attached to it
Underground Water Lines
Leaks in underground water lines are among the most difficult and costly to detect and repair. Because these pipes are buried, often 4 feet below grade to avoid the frost line, significant leaks can go unnoticed for long periods, silently driving up your water bill.
Common Scenarios:
Underground Lines Between Structures
When water lines run between buildings (such as between a house and a detached garage or barn), leaks can be especially hard to isolate. Often, the only reliable method to confirm a leak is to shut off and isolate sections of the line.
Fix:
Once confirmed, the leaking section will need to be excavated and either repaired or fully replaced. In many cases, replacing the entire run is more reliable than a repair.
Slab Foundation Leaks
In homes where water lines run through concrete slab foundations, leaks may present as water bubbling up through cracks or seams in the floor. These leaks can be difficult to locate precisely.
Fix Options:
- Excavation: Requires removing flooring and breaking through the slab, which is invasive, costly, and disruptive.
- Re-routing: In many cases, it’s more practical to re-route the water lines through the attic or walls to bypass the slab entirely. This avoids unnecessary demolition and future risk of below-slab failures.
Regional Note: Massachusetts Homes
Most homes in Massachusetts are built with basements, which makes plumbing lines visible and easier to access. However, homes with slab-on-grade foundations, such as Campanelli-style ranches, have water lines embedded directly in the concrete. These homes are increasingly experiencing below-grade leaks as the piping systems age.
Final Thoughts
Small or unnoticed leaks can add up to significant water bills surprisingly quickly. By regularly inspecting your plumbing system, you can catch issues early, make timely repairs, and avoid unnecessary costs.
If you have a leaking fixture, need help locating the source of a leak, or just want a second set of eyes on your plumbing system, we’re here to help.
Call us at (508) 233-2382
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