A 50-City Study on Dishwasher vs Hand Washing Cost, and Why the Answer Isn’t What You’d Guess

Most people argue about the wrong thing. They ask whether a dishwasher or the sink is cheaper. But that is not really the question that decides your bill.

We wanted a real answer, not a guess. So we pulled actual utility rates for the 50 largest US cities, took the water and energy each washing method uses from a peer-reviewed study, and worked out what each one costs per year in every city. Then we added detergent.

Here is what we found, and why the usual advice misses the point.

How we worked it out (in plain English)

We kept it simple and fair. Same amount of dishes, same number of washes, in every city. The only thing that changes from city to city is the local price of water, gas, and electricity.

The water and energy each method uses comes from a University of Michigan study that measured all three methods in a lab. We did not invent those numbers. We just applied real 2024 utility prices to them.

Three ways to wash, three very different costs

Here is the national average across all 50 cities. The picture is clear.

So the machine sits in the middle. It easily beats the worst way to hand wash, but it loses to the best way to hand wash. That single fact is the whole study.

Most of that cost is not the water itself. It is the energy to heat the water. That is why the way you wash matters so much. Leave the tap running hot and you are literally pouring money down the drain. If you want the details on the machine side, we broke down how much electricity a dishwasher uses in a separate guide.

Your city changes the math

The same dishwasher does not cost the same everywhere. Running one costs about $102 a year in Memphis but about $196 in San Francisco. That is nearly double, for the exact same machine doing the exact same job.

Why the gap? Water and energy prices. San Francisco has some of the priciest water in the country. Memphis has some of the cheapest. Your machine is only as expensive as your local rates make it.

A few examples to show the spread:

• New York City: dishwasher $147, running tap $170, two-basin $69.
• Seattle: dishwasher $128, running tap $303, two-basin $108. Notice the huge running-tap number. Expensive water punishes the wasteful method hardest.
• Houston: dishwasher $115, running tap $170, two-basin $70.
• Phoenix: dishwasher $109, running tap $139, two-basin $61.

This is also why national “a dishwasher costs X per year” claims are close to useless. The real number depends on where you live. The full table below has all 50 cities, and you can copy any city’s numbers with one click.

The running tap is the real budget killer

Here is the part that surprised us most. The difference between the two hand-washing styles is bigger than the difference between hand washing and the machine.

Running tap vs two-basin: about $116 a year apart on average. In San Francisco that gap hits $210 a year. Same hands, same dishes, same sink. The only difference is whether you leave the water running.

So if you hand wash, the fix is not “buy a dishwasher.” The fix is “stop running the tap.” Fill one basin with hot soapy water, wash, then rinse in a second basin of cool water. That one change does more for your bill than switching to a machine.

And if you do use a machine, the same logic applies to the machine’s habits. Skip the pre-rinse, skip heated dry, and only run full loads. Those habits matter more than the model you own, though a well-kept machine also lasts longer, and it is worth knowing how long a dishwasher usually lasts before you replace one.

But what about your time?

Fair question. We left time out of the dollar math on purpose, and here is why.

Putting a price on an hour of your time is guesswork. Is it minimum wage? Your salary? Zero, because you listen to a podcast while you scrub? Any number we picked would be arguable, and it would swamp the real utility costs we measured. So we kept the money math to actual bills.

But let’s be honest about it. A dishwasher saves real time. The Michigan researchers found that once you value time at the average US wage, the machine pays for itself fast, because loading a rack takes a few minutes and hand washing does not.

So the honest takeaway is this. If you are counting dollars on your utility bill, the two-basin sink wins. If you are counting hours in your day, the dishwasher wins. Both can be true. Just don’t let anyone tell you the machine is cheaper to run, because on the bill alone, done right, it usually is not.

The full cost for all 50 cities

Sorted from cheapest to priciest by dishwasher cost. Click “Copy” on any row to grab that city’s numbers with the source link.

A note on repairs and the machine itself

We only measured running costs here. We did not count what it costs to buy a dishwasher, install it, or fix it. Those are real, and they can flip the math if your machine breaks often.

If you are weighing a repair against a replacement, we cover what it costs to fix a dishwasher in detail. And if your machine fills with cold water because of your plumbing, that quietly raises your energy cost, which is common with the wrong setup for a tankless water heater. A newer energy-efficient dishwasher also uses less water and power per load, which shrinks every number in our table.

Methodology

We think you should be able to check our work. Here is exactly what we did and where every number came from.

What we measured. The yearly running cost of three washing methods in the 50 largest US cities: a machine dishwasher, hand washing under a running tap, and hand washing with the two-basin method. Cost = water and sewer + energy + detergent, for 215 loads a year.

Water and energy per wash. Taken from the lab measurements in Porras, Keoleian, Lewis and Seeba (2020), “A guide to household manual and machine dishwashing through a life cycle perspective,” published in Environmental Research Communications. Per load: dishwasher 3.5 gallons and 1.56 kWh; running tap 22.8 gallons and 3.02 kWh of water heating; two-basin 6.9 gallons and 1.22 kWh of water heating.

Energy prices. Residential electricity and natural gas prices by state for 2024, from the US Energy Information Administration (electricity, natural gas). Each city uses its state’s rate, since energy is regulated at the state level. Our base case assumes a natural gas water heater (about half of US homes) at 60 percent recovery efficiency, following the US Department of Energy test method.

Water and sewer prices. Derived from Black & Veatch’s 2024 50 Largest Cities Water/Wastewater Rate Survey. We used each city’s basic-use water and sewer bill and its reported household size to get a per-gallon water and sewer price. Because dishwashing uses a small volume, it sits inside that basic-use tier, so this is a close and fair estimate.

Detergent. Priced from 2025 US retail listings, applied by the gram amounts measured in the Porras study, so the same logic is used for machine pods and hand-wash liquid. A dishwasher pod plus rinse aid, or dish liquid for hand washing.

What we left out. The purchase price of the machine, installation, maintenance and repairs, and the value of the user’s time. These are real costs, but they are not part of the water, energy and detergent bill this study measures.

One honest limit: water is priced by city and energy by state, because that is how each is actually regulated and sold. And prices shift over time, so treat these as accurate for 2024 to 2025, not forever.

Cite this study