Older toilets can use more than four times per flush. Is it time to switch yours to a WaterSense labeled high efficiency toilet?

Toilets are the main source of water use in the average home, so learning how to take care of your toilet can mean real water savings – it can also help keep your water and sewer bills in check. You can reduce the amount of water used by your home’s toilet(s) by checking for leaks at least twice a year and, when possible, upgrading to a high-efficiency toilet

Check for toilet leaks 

Leaking toilets can waste thousands of gallons of water a month, leading to higher bills. Sometimes toilet leaks are easy to hear, but many times they can be silent - making them easy to miss.
Here's how to check your toilet for leaks:

Here’s how to check your toilet for leaks:

  1. Remove the toilet tank lid.
  2. Drop one dye tablet or 10 drops of food coloring into the tank. (Dye tablets are often available for free from local water providers).
  3. Put the lid back on. Do not flush.
  4. Wait 20 minutes.
  5.  Check your toilet bowl. If you see colored water, you have a leak. If not, you don't.

Identifying Common Toilet Leaks

Fixing Toilet Leaks


Why replacing your old toilet with a High Efficiency Toilet makes sense

Older toilets can use 1.6, 3.5, 5, or even up to 7 gallons (!) of water with every flush. Replacing an older model toilet with a new high efficiency toilet (HET) that uses only 1.28 GPF can greatly decrease your household's total water usage. Here are some things to keep in mind:

  • If you decide to upgrade, look for the WaterSense logo (think EnergyStar, only water).  To earn this label, toilets must meet rigorous criteria for performance and must use no more than 1.28 GPF. Only HETs that complete the third-party certification process can earn the WaterSense label.
  • HETs are widely available at home improvement and plumbing stores, and typically cost about $100-400 plus any installation fees. The estimated payback time for a HET typically ranges from half a year to five years depending on the cost of your toilet and your household's annual water and sewer costs. Looking for information on which toilets perform the best? You can geek out to your heart's content with this information
  • Check with your water provider for rebates! You could receive anywhere from $40-100 off your purchase. Can’t afford an upgrade? If purchasing and installing a new toilet is not an option, you can still save water by finding and fixing toilet leaks.

What about retrofitting older toilets?

In some cases, people can retrofit an older toilet (those that use 3.5 gallons of water per flush or more) so that it uses less water each time it flushes. Retrofitting can be accomplished using different methods to reduce the amount of water needed to fill the toilet tank. These methods are not recommended because, while they shrink the tank, they don’t shrink the bowl, leading to the risk of having to flush twice.

Fill Cycle Diverter - used to conserve water in older toilets

If purchasing or installing a new toilet is not an option, one of the easiest retrofits is installing something called a fill cycle diverter. The fill cycle diverter is a simple plastic device that directs more water to the tank and less to the bowl while they refill. This way the tank and bowl finish filling at roughly the same time and water isn’t wasted while one runs water while the other one fills. Once installed, a fill cycle diverter will save about half a gallon of water with each toilet flush.