July 15, 1946. That’s the date stamped inside the tank of my guest room toilet. That explains a lot. My house was built in 1946, so it’s an original toilet. You can hear the humming of pipes for several minutes after someone flushes. It takes all that time to fill back up. I am not imagining this. The Environmental Protection Agency says toilets manufactured before 1980 use an average of five gallons per flush, sometimes more.
The EPA also says that toilets use more water than anything else in our homes (30 percent). Amazing! That’s why I wanted to know whether switching to low-flow toilets was worth it, how fast those toilets would pay for themselves, and how much money I — and you — could potentially save. So I plugged various scenarios into the EPA’s WaterSense Calculator.
The calculator asks how many people live in your house and the age of your toilets. If my whole house was full of 1946 toilets, like the one in my guest room, and my mother-in-law were visiting, which would make us a family of four, our savings would be extra impressive. By switching to high-efficiency WaterSense toilets, which use just 1.28 gallons per flush, we would save 27,000 gallons of water and $230 per year.
Next I peeked into the tank of the toilet in my master bathroom. The mint-green color and Space Age shape hint at the time period, and, sure enough, this one was stamped February 6, 1990. Happy 28th birthday, baby! Toilets made between 1980 and 1994 averaged 3.5 gallons per flush. So imagine if my entire house were outfitted with these, and that my mother-in-law still hadn’t left. In this case, by switching to WaterSense toilets, I would save 16,000 gallons of water and $140 per year.