Leak Detection
Free Toilet Leak Detection Tablets Available
The Wellesley Water & Sewer Division wants you to check your home for water leaks. These leaks can be undetectable to the eye but can drive up water bills and waste gallons of water.
From March 17 through May 17, 2025 the public can pick up water leak detection tablets to use in home as part of the DPW's Toilet Leak Detection Initiative.
The tablets are free and available at the DPW Engineering desk (20 Municipal Way), Wellesley MLP lobby (4 Municipal Way) , Tolles Parsons Center (500 Washington Street), Wellesley Free Library main branch lobby (530 Washington Street), and at the Refundable Bottle & Can shed (169 Great Plain Avenue). Each tablet pack comes with two leak detection tablets and test instructions. Results are available in 15 minutes. If blue dye appears, there is a toilet leak.
Common sources of toilet leaks are:
- Deteriorated or corroded flapper valve and valve seat
- Improperly working flushing arm and lift chain
- Toilet tank water level is too high
- Corroded float rod, ballcock and/or float ball
In some instances, these issues can be fixed by homeowners, while other issues may require a plumber.
How to test for a leak:
- Wait 5-10 minutes after the last flush cycle to perform the leak test.
- Remove the cover. Gently drop one Leak Detective tablet into tank. DO NOT FLUSH.
- Wait 15 to 20 minutes.
- If blue dye appears in bowl, you have a leak.
QR CODE FOR SURVEY
What to Do If You Detect a Leak:
Turn Off the Water Supply: Immediately turn off the water supply to the toilet to prevent further water wastage. This will stop the flow of water into the tank and bowl.
Inspect for the Source of the Leak: Try to identify which component is causing the issue by checking the flapper, flush mechanism, water level, and float components. If you're unsure, it may help to call a plumber.
Consider DIY Solutions: Many toilet leaks are simple to fix with a new flapper, adjustment of the float, or replacing a corroded part. These parts are inexpensive and easy to install, and you can find most of them at your local hardware store.
When to Call a Plumber: If you're unable to find the source of the leak, or if the leak persists after attempting repairs, it's a good idea to call a professional plumber. Plumbers have the tools and expertise to identify and fix more complicated issues, such as damaged valve seats or complex internal mechanism
Common Source of Leaks:
Flapper Valve and Valve Seat Have Deteriorated or Corroded
Cause: The flapper valve is a rubber seal that controls the release of water from the tank into the bowl when you flush. Over time, the flapper can become worn out, brittle, or corroded, causing water to leak from the tank into the toilet bowl.
Solution:
- DIY Fix: Replace the flapper. This is a simple and cost-effective fix that most homeowners can do themselves. To replace the flapper, turn off the water supply to the toilet, drain the tank, and remove the old flapper. Attach the new one to the flush valve, making sure it fits properly.
- When to Call a Plumber: If the valve seat (the part where the flapper rests) is damaged, you may need professional help to replace it.
Flushing Arm and Lift Chain Are Not Working Properly
Cause: The flushing arm and lift chain connect the handle to the flapper valve. If these parts are misaligned, damaged, or rusted, they can prevent the flapper from sealing properly, causing a slow leak.
Solution:
- DIY Fix: Check the flushing arm and lift chain for any rust or damage. Adjust the chain so it has a little slack but is still taut enough to lift the flapper. If any parts are rusted or broken, replace them with new ones.
- When to Call a Plumber: If adjusting or replacing the parts doesn't resolve the issue, a professional might need to inspect the internal mechanisms.
The Water Level in the Tank is Too High and Spills into the Overflow Tube
Cause: If the water level in the tank is too high, it can spill into the overflow tube and waste water. This can happen if the fill valve is set too high or the float mechanism is malfunctioning.
Solution:
- DIY Fix: Adjust the float or the fill valve to lower the water level. The water should be about an inch below the top of the overflow tube when the tank is full. If the fill valve is faulty, you can replace it with a new one.
- When to Call a Plumber: If you're unsure how to adjust the water level or if the issue persists after adjusting, a plumber can help with proper adjustments or replacements.
The Float Rod, Ballcock, and/or Float Ball Are Corroded
Cause: The float rod, ballcock, or float ball are essential components that regulate the water flow into the tank. Over time, these parts can corrode, causing the float to stick or not rise properly, which can lead to overflows or continued water running.
Solution:
- DIY Fix: Inspect the float, float rod, and ballcock. If any part is corroded or damaged, replace it with a new part. You may need to replace the entire float assembly to restore proper functioning.
- When to Call a Plumber: If you're not comfortable replacing these parts yourself or if you can't determine the exact cause of the issue, a plumber can handle this replacement efficiently.
EPA Fix-a-Leak-Week is March 17-23
The Water Division is encouraging residents to check homes for unknown water leaks. According to the U.S. Environmental Protection Agency, 10 percent of homes have leaks that can waste 90 gallons or more per day-enough to fill 1,440 glasses of water. Household leaks not only can waste a tremendous amount of water, they also can damage your home and garden.
Follow us on Twitter @wellesleydpw Instagram @dpw.wellesley Facebook Wellesley DPW in honor of national “Fix a Leak Week” and learn how to detect and chase down water leaks.
Water Leak Tips
To save water, energy, and lower bills, customers should check, twist, and replace:
- Check for leaks. Look for dripping faucets, showerheads, sprinklers, and other fixtures. Check for toilets with silent leaks by putting a few drops of food coloring into the tank, waiting 10 minutes, and seeing if color appears in the bowl before you flush. Don’t forget to check irrigation systems and spigots too.
- Twist and tighten hose and pipe connections. Twist on a WaterSense labeled faucet aerator and you’ll save water and still have adequate for brushing teeth and washing hands.
- Replace the fixture if necessary. WaterSense labeled models are independently certified to use 20 percent less water and perform as well as or better than standard models.
The facts on indoor leaks:
- The average household's leaks can account for more than 10,000 gallons of water wasted, or the amount of water needed to wash 270 loads of laundry.
- Household leaks can waste more than 1 trillion gallons annually nationwide. That's equal to the annual household water use of more than 11 million homes.
- 10 percent of homes have leaks that waste 90 gallons or more per day.
- Common types of leaks found in the home include worn toilet flappers, dripping faucets, and other leaking valves. All of them are easily correctable.
- Fixing easily corrected household water leaks can save homeowners about 10 percent on their water bills.
The facts on outdoor leaks:
- Outdoor water use can account for up to 50 percent of a home’s total water use
- Outdoor water leaks can be found in many areas: spigots, garden hoses, irrigation systems, pools & saunas.
- Ways to detect outdoor leaks: pooled water, soft, squishy, or sunken areas of the yard, regular refilling of a pool or sauna, high water bills.