There’s a new trend in home-oriented magazines and articles to push certain upgrades as good for the environment and for your wallet because they save energy or water. I found an article on CNN.com that enthusiastically recommended replacing all your old appliances with Energy Star models and your old toilets with new 1.6 gallon models. The article claimed boldly that you’re doing your wallet, as well as Mother Earth, a favor.
Just for the heck of it, I decided to do the calculations to determine the payback time for replacing a toilet. I began with the guess that a family on well water was paying more for their water than a family on city water. Well, after two different calculations using numbers from two different sources, I turned out to be dead wrong. The *energy* cost of having a well is quite low–only about $60 a year at the most for most families. The cost of well water comes from the equipment–the well head, the pressure tank, the purification system, and the septic–and their maintenance, not from the energy used to get the water from the ground. (The extra wear and tear on this equipment because of the additional water it handles due to high-flush toilets wasn’t estimated, but it’s probably pretty negligible.)
Let’s add a second, fictitious family that has an average monthly municipal water bill of $150 a month, which is apparently possible in some desert locations and areas of California, for an annual rate of $1800. And to make it a bit more sane, let’s throw in a third, who has a modest $25/mo rate (say, in Beaumont, TX), for a yearly total of $300.
Next, I looked at data for what percentage of domestic water consumption goes to toilets when old models are used. A generous estimate is about 40%. So, you take $60*.4=$24. A high estimate for how much a family on a well will spend directly on pumping their water for flushing the toilet is $24.
The folks in California spend $720 a year flushing their toilets.
The folks in Beaumont spend $120 a year.
Each of these families toilets that use 5.5 gallons per flush. If they change to 1.6 gallon toilets, they will save a sum that is equal to their current expense * 1.6/5.5.
So the well water family will save $7.
The CA family will save $209.
The Beaumont family will save $35.
Now, if you renovate your bathroom, you are required to buy a new toilet rather than just replacing your old one in most areas if the old one doesn’t follow current guidelines. But if you are thinking of replacing a toilet yourself for purely economic reasons, consider these payback periods.
The cheapest toilets run about $70. Anything you spend beyond that you can’t justify by pointing at water savings (the cheap-o Crane toilets-in-a-box are perfectly capable now, unlike 10 years ago) but just because you want to spend more money on a toilet that you either like better or think will work better. My advice is to go with Toto or Caroma if you’re into performance, and buy Kohler only if you really like the style. And don’y say, “But look at all the money we’ll save…” You’ll save more by buying the Crane. What you spend beyond that is justified by wanting something prettier or with a super-high-tech-anti-marking coating or something like that. It’s a frill, which is fine as long as you admit it.
If there is one toilet in the house, it will take:
10 years for the savings to equal the cost for the well water family
4 months for the CA family
2 years for the Beaumont family
If there are two toilets, it will take:
20 years for the well water family
8 months for the CA family
4 years for the Beaumont family
If there are three toilets, it will take:
30 years for the well water family
1 year for the CA family
6 years for the Beaumont family
If there are four toilets, it will take:
40 years for the well water family
1.33 years for the CA family
8 years for the Beaumont family
Of course, not all toilets are used to the same degree. So while it would make financial sense to replace all four toilets in the CA house, it might be better to replace the two (out of four) most heavily used ones in the Beaumont house with a payback time of, say, six years and leave the other two alone.
What about me? Well, I have four toilets in my well-water house. Three of them will be replaced when I remodel the bathrooms they’re in–not just because I have to but because they are blue, yellow, and mustard-colored. The fourth is white and is used maybe ten times a year. I’m leaving it well enough alone!
What if you’re on a well but you want to make the very best environmental decision, rather than an economic one? Even then things get mess. You’re using very little additional energy to put that water through your pipes, and it’s very hard to quantify what, if any, damage you might possibly be doing by putting the water into a well maintained septic field. Additionally, you have to consider that a new toilet has some very definite energy and material environmental costs associated with it in its production and shipping. I’d bet that your best choice, environmentally speaking, would be to leave the toilets you have until they suffer damage. But quantifying that sort of thing will be highly individual according to the circumstances–and devilishly difficult, as well.