Leak Detection

A leaky faucet, toilet, shower head, or irrigation system may seem harmless, but more than 10,000 gallons of water are wasted each year from leaks in the average household. Leaks not only waste a lot of water but can also cause outrageous utility bills. Find and fix leaks to save water, energy, and potentially even money on utility bills! Check for leaks around the home by reading your water meter and inspecting water fixtures, such as your toilet, faucets, shower head, and irrigation system. 

Fix A Leak Week

Fix a Leak Week Animation Banner

Fix A Leak Week is a national event held by EPA WaterSense each year to encourage water consumers to find and fix household water leaks to save water, energy, and possibly even money on utility bills. This year, Fix A Leak Week is March 18-24, 2024. Celebrate by being a leak detective and checking for water leaks in the kitchen, bathroom, laundry room, basement, and outside. Most leaks are easy to fix, such as a dripping faucet or running toilet. Finding and fixing leaks is simple! Inspect fixtures, twist and tighten connections, and replace if necessary with WaterSense-labeled models to save at least 20% more water without sacrificing performance. There are many ways to get involved in Fix A Leak Week:

Social Media Marathon on X (Formerly Twitter)2024 fix a leak week social media marathon graphic

Join us on X (Formerly Twitter) @ConcordNHGS on Monday, March 18, 2024, from 2:00 p.m. to 3:00 p.m. EST to kick off Fix A Leak Week! We will be joining the live national conversation about how to find and fix water leaks. Follow the conversation and tweet along using the hashtag #FixALeak.

Free Toilet Leak Dye Test Kits

Toilet Leak Dye Test Kit

Free Toilet Leak Dye Test Kits are available at our Utility Billing Office at 311 North State Street. Grab one to perform a quick and easy leak test on your toilet! Each kit includes two dye strips, so you can test two toilets. The kits will be available while supplies last through March 22, 2024, so grab them before they’re gone! Or, use food coloring dye at home and follow the instructions from our "How To Detect A Toilet Leak" video below.

Royal Leak Detection Contest2024 Royal Leak Detection Graphic

Enter our Royal Leak Detection contest for a chance to win a WaterSense-labeled toilet that is certified to use 20% less water without sacrificing performance. Leaks can be a royal pain! Perform a "royal" leak detection to find and fix water leaks. Tell us how you have found and fixed leaks with our contest entry form and/or by sharing with us on social media. One lucky winner will win a new American Standard Edgemere White Round Chair Height Toilet that uses only 1.28 GPF (gallons per flush)! All submissions must be received by 5:00 p.m. on Sunday, March 24, 2024.

How To Enter:

Enter one of two ways - or enter both ways to double your chance to win!

  1. Submit a Contest Entry Form (Choose One Option Below):
    • Online Submission Form
      • An account is not required for entry.
    • Print & Mail Paper Form
      • 311 North State Street, Concord, NH 03301 (c/o Royal Leak Detection Contest)
    • Utility Billing Office
      • Visit our office at 311 North State Street to complete and submit a printed form in person during business hours of 8:00 a.m. to 4:30 p.m., Monday through Friday.
  2. Social Media
    • Tag us in a public post on Facebook, X, or Instagram @ConcordNHGS and share with us how you have found and fixed water leaks (scroll down to get some ideas on how to be a leak detective). Pictures are encouraged, but not required. 

Submit both a contest entry form and post on social media to double your chance to win! By entering the contest, you agree to the official contest rules.

How To Find & Fix Water Leaks At Home

There are many ways you can determine if you have a leak around the house. Here are a few ideas of how you can be a leak detective:


Check all fixture connections and see if any water is leaking through. Sometimes tightening is all that is needed. Consider adding an aerator (a twist on screen that adds air into the water stream) to your faucets to save water, without sacrificing the water pressure.


Many toilet leaks are caused from the flapper being broken or decayed. The flapper is the piece of rubber that is attached to the toilet handle that allows the water to flow into the toilet bowl from the tank after flushing. A quick flapper replacement should do the trick! Learn how to flip your flapper.

Another common toilet leak is water flowing down the overflow tube. If this is the case, lower the water level in the tank to save water and reduce utility costs. If you can hear the toilet running, then that is a sure way to tell if you have a leak. You can still have a leak, even if you don’t hear your toilet running! If your flapper looks fine and there is no water going down the overflow tube, a good way to test for a leaky toilet if your is to perform a dye test. Simply place dye into your toilet tank (do not flush) and wait for approximately 30 minutes to see if the water in the bowl changes to the dye color. If it does, then water is leaking from the tank. Be sure to flush after the test to remove the dye. Most toilet repairs are easy fixes and parts can be easily found at local hardware stores. Consider upgrading to a WaterSense-labeled toilet to reduce your water use by 20-60%! Older toilets use as much as 6 gallons of water per flush, while newer water-efficient toilets, such as WaterSense labeled models, use closer to 1.3 gallons per flush, while still providing equal or superior performance!


Shower heads can also get old and leak. A showerhead that drips 10 drops per minute can waste more than 500 gallons of water per year! Most leaky showers can be fixed by tightening fixture connections. A simple fix would include wrapping the leak with pipe tape, or consider upgrading your showerhead to a WaterSense labeled model to save water and potentially even money off utility costs.


Garden hoses and irrigation systems should be checked regularly, especially after winter to check for damage from frost or freezing. Make sure connections are tight. Pipe tape can be used for a quick solution to wrapping up any leaks.

Another great way to detect if you have a water leak is by reading your water meter. Most repairs are easy fixes and parts can easily be found at a local hardware store, but contact a licensed plumber if additional help is needed. Visit our WaterSense web page for more information about EPA WaterSense and ways to conserve water.

City Leak Detection

Our crews continually work at fire hydrants and valves to find any potential water leaks throughout Concord. Finding hidden leaks helps to conserve water, which prevents the waste of City treated water and reduces the efforts and costs of excessive pumping. Water service will not be interrupted unless a leak is found. Notice will be given if a leak is found before repair. The City of Concord is not responsible for leaks found within private property.