Until the early 1980s, most toilets used 5-7 gallons per flush. Toilet technology has progressed (with a few mis-steps) to the point where ultra-high efficient toilets are available today that use only .8 gallons per flush. That may look like a typo, but companies such as Niagara Conservation have developed toilets that conserve water and still perform.

GPF Identification

While some toilets are labeled with their gallons per flush (GPF) rating, most are not.  So how is one to know?  The best way is to look at the date code inside the toilet tank.  Over the years, federal and state regulations have changed, and using those dates can be the best way to estimate the GPF of a toilet.  Starting in 1983, toilets were regulated to a maximum of 3.5 GPF.  As of 1994, toilets were regulated to a maximum of 1.6 GPF.  Most recently, the state of California has mandated a maximum GPF of 1.28, as of 2014.  A 1.28 GPF toilet qualifies as an EPA Water Sense “high efficient toilet”, and is eligible for rebates from many water companies.

Ultra-High Efficient

While our state currently requires 1.28 GPF toilets, many people have gone a step further and installed Ultra-Hight Efficient Toilets (UHET).   One example of a UHET is the Stealth, manufactured by Niagara Conservation.  Many people are understandably worried about performance, since having to flush twice to clear the bowl negates potential water savings.  In response, the industry has created the MaP test to ensure water saving don’t come with reduced performance.  Check out the website and videos if you don’t believe.


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