Ten of the 14 counties of Massachusetts are currently in a Level 3 drought, Critical Drought—including Suffolk County, which contains Boston; Middlesex County, which contains Cambridge and Somerville; and Essex County, which contains Salem. This is a ban on all non-essential outdoor water use (not including our vegetable garden).

This past month watering has sometimes felt kind of futile. I’d water and then less than an hour water the soil would be dry like I hadn’t watered at all, or our housemate PJ would water and I’d come outside and think she hadn’t watered because the soil was already dry.
Given that we are in a drought, and that I’m not really sure what Level 4 is going to look like, I got curious about how much water my various daily water-using activities take up.
Normal Shower
On Sunday I took a shower like I normally do, except this time with the drain plugged, with the water on while I:
- apply shampoo
- rinse off shampoo
- apply conditioner
- soap legs and shave
- rinse off
- brush my teeth
- rinse off conditioner
- soap everything
- rinse off
This shower took 16 minutes and 20 seconds.
At the end of the shower the tub was full to 13.7 cm depth in the middle or 13.4 cm depth one-third of the tub in from each side. I’m going to assume the average depth was about 13.4 cm. The sides of the tub are sloped, but halfway up the depth of the water, at 6.7 cm depth, the tub is 50.8 cm wide and 124.5 cm long. The volume of water, then, was 13.4 cm × 50.8 cm × 124.5 cm = 84,700 cm³, or 22.4 gallons.
(I also timed how long it takes our shower to fill two cups. It took 6 seconds to fill 2 cups, or 48 seconds to fill a gallon, which means 16 minutes and 20 seconds used 20.4 gallons of water. I’d say the two estimates are close enough.)


Water-Saving Shower
On Monday I took a water-saving version of my usual shower, which went like this:
- turn on shower, get moist, and turn off shower
- apply shampoo
- turn on shower, rinse off shampoo, and turn off shower
- apply conditioner
- soap legs and shave
- brush my teeth
- turn on shower, rinse off conditioner, and turn off shower
- soap everything
- turn on shower, rinse off, and turn off shower
Still the same number of steps, just colder and creepily quiet.

This shower took 12 minutes and 36 seconds total, including both water-off times and water-on times. At the end of it the tub was full to 5.4 cm depth in the middle or 5.1 cm depth one-third of the tub in from each side. Halfway up the depth of the water, at 2.6 cm depth, the tub is 48.3 cm wide and 120.7 cm long. The volume of water, then, was 5.1 cm × 48.3 cm × 120.7 cm = 29,700 cm³, or 7.9 gallons.
Only having the water on to rinse off, in other words, uses 35.3% of the water used by my normal shower.
Bath
I started taking baths only recently, when a collaborator and friend said they’d started taking baths during the pandemic to disconnect from the world and I decided I wanted to try it. I take a bath once or twice a month, especially in challenging months, though sometimes I miss months, presumably because they aren’t challenging months. Highly recommend, especially with a nice book.
When I take a bath I fill the tub up most of the way—about 25.0 cm depth. Halfway up the depth of the water, at 12.5 cm depth, the tub is 52.1 cm wide and 127.0 cm long. The volume of water, then, is 25.0 cm × 52.1 cm × 127.0 cm = 165,400 cm³, or 43.7 gallons.
Taking a bath, in other words, uses about twice the water used by my normal shower, or about 5.5 times as much water as a water-saving version of my normal shower.
Watering the Vegetable Garden
Next I measured how much water I use when watering our vegetable garden. I timed that it takes on average 2.384 seconds (average of five samples: 2.38, 2.60, 2.50, 2.26, and 2.18) to fill two cups—or 19.1 seconds to fill a gallon—using our water hose at the setting I use, coincidentally called the shower setting. I then timed myself watering the plants, pausing the timer whenever I paused the plant-watering. It took me five minutes and 26 seconds to water the plants, or 17.1 gallons.
Running the Dishwasher
I run our dishwasher once a day on Normal Energy Saving mode, which apparently uses anywhere from 2.4 to 6.8 gallons of water.
Back when we lived in Cambridge we had a tiny countertop dishwasher (referral link, which means I make a small amount of money if you click and buy something) I ran once a day for the two of us. At some point our kitchen sink wasn’t draining so I unhooked the output house and left it in our tiny under-sink recycling bin. A full dishwasher run filled at most a fourth of the tiny four-or-five-gallon under-sink recycling bin with dirty water, or at most 1.3 gallons.
Handwashing dishes, at least the way I do it, uses substantially more water than a dishwasher. I used to pre-rinse dishes before loading them into the dishwasher and that was dumb and I didn’t realize it was dumb until my parents pointed out to me that it was dumb. Modern dishwashers have gotten good enough that they wash the dishes quite well on their own, and even if they don’t it’s still better to just wash any still-dirty dishes with the next load. Some modern dishwashers apparently even have a garbage disposal.
Washing the Laundry
I run our high-efficiency front-load washing machine on normal or, usually, normal with extra rinse. I couldn’t find actual water usage online and wasn’t willing to spend much time looking but it looks like a similar washing machine uses 11.9-13.9 gallons. I think I run the laundry machine on average 1.5 times a week, so that averages out to 2.6-3.0 gallons a day.
Flushing the Toilet
Our toilets are water-saving toilets with two flush modes, one that uses 1.6 gallons and one that uses 1.1 gallons.
Apparently older toilets from the 1980s through 1992 used 3.5 gallons per flush, and earlier toilets used 5.0-8.0 or more gallons per flush. The average American apparently flushes the toilet five times a day, so the difference between an old toilet and a new toilet adds up.
Washing My Hands
I timed myself washing my hands: 16 seconds. Running the sink for eight seconds filled two cups of water, so washing my hands uses four cups of water, or one-fourth of a gallon.
Drinking
Apparently an adequate daily water intake is 11.5 cups (0.7 gallons) for women or 15.5 cups (1 gallon) for men. I assume I drink less than that.
Conclusions
Here’s the final accounting.
Bathing options:
- taking a water-saving shower: 7.9 gallons/person/day
- taking a normal shower: 22.4 gallons/person/day
- taking a bath: 43.7 gallons/person/day
Going to the bathroom:
- flushing a water-saving toilet: 1.1-1.6 gallons, or maybe 5.5-8.0 gallons/person/day
- flushing a 1980s-1992 toilet: 3.5 gallons, or maybe 17.5 gallons/person/day
- flushing a really old toilet: 5.0-8.0+ gallons, or maybe 25.0-40.0+ gallons/person/day
- washing my hands: 0.3 gallons, or maybe 1.5 gallons/person/day
Dishes and clothes:
- running the dishwasher: 2.4-6.8 gallons, or 0.8-2.3 gallons/person/day
- running the laundry machine: 11.9-13.9 gallons, or 1.3-1.5 gallons/person/day
Sustaining life:
- drinking: 0.7-1 gallons/person/day
- watering the vegetable garden: 17.1 gallons, or 5.7 gallons/person/day

My personal total daily water usage ends up at 42.4 gallons per day, 22.4 of those gallons being my showers:

I am needless to say absolutely horrified by my water usage. I’m surprised by just how much water my daily showers use relative to the rest of my water-using activities, and how much a small (to me) change to my shower habits improves my overall water usage—me switching to water-saving showers should save about 5,300 gallons a year, which is enough to fill a 15-foot-diameter backyard swimming pool. I’m also stunned by how much water our water-saving toilets save. The dishwasher and laundry machine use more water than I expected, but when that water is divided by the number of people and frequency of use they use less water than I expected. Once the water use from showering is decreased, watering vegetables and flushing the toilet become close contenders, which also surprises me—but that means those are the areas to focus further improvement.
PJ and Cory set up a giant 55- or 60-gallon rain barrel that collects the water that runs down the gutters from the roof. The rain barrel has so far vacillated between no use for weeks to overflowing in a few days, because that is about what the weather is. We also collect about two gallons of water a day from the basement dehumidifier. Both of these sources we use to water plants, so they offset our water usage a little bit.
Some easy ways I am going to try to use less water without altering my lifestyle:
- I’m very happy with the water-saving version of my shower, especially now that I am also occasionally taking baths and I should offset the baths somehow. The water-saving version allows for less standing around in the flowing water, but I listen to music (this is my shower speaker—referral link so if you click and buy I get a small percentage) while I shower anyway so maybe that’s okay. When it’s not so hot I sometimes switch from daily shampoo and conditioner to shampoo and conditioner once every two days, so that will also help. I also have been considering trying sugar waxing instead of shaving to save shower time (not actually for the water but because I’m lazy), so that will also help a little.
- It should also be very easy to decrease water usage from hand washing just by running the water less intensely; I could probably use half the water without noticing much difference.
- Right now I am the kind of person who wears clothes once and then washes them even if they are still clean. I am going to start wearing pants and skirts at least twice before declaring that they are dirty. I’m also going to buy more of our rate-limiting clothes, which is bras for me and work shirts for Cory, so that we can stretch the time between laundry-doings a tiny bit. Not just water saving—again, I am lazy.
- Kind of tempted to not flush pee when I’m working from home alone. Kind of. We’ll see how committed I end up being to this endeavor.
- Our housemate/friend/landlady PJ is thinking about getting a second rain barrel, which will shift more of our vegetable garden watering to rainwater (when we get rainwater).
- We are also thinking about switching our vegetable garden watering to drip irrigation, which should use less water—but that’s a lot of work and who knows if we’ll get to it.
Luckily the biggest changes are not hard to make. I’m glad I measured.





































































































































