How to Save Water on a Boat

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sink facet with running water in a boat galley

When your boat is off the dock, conserving water is a constant challenge.

It’s an ongoing battle when you are trying to save water on a boat – from showering to washing dishes and even flushing the toilet. So much that even some of the saltiest sailors say they would consider buying a watermaker for their boat.

Even with two 80-gallon water tanks, we had to drastically adjust our usage habits to stay out of the marina. Learning to stretch our water supply was a priority once we cast off the dock lines.

Cleaning is the biggest consumption of water on a sailboat. Showering, washing dishes, and laundry all use a lot of water on board. Adapting to use less water in these areas allows you to stay off-grid longer and more time in places you love.


Showering on a Boat

Did you know the average American uses 17.2 gallons of water to take a shower? Man, that water goes fast on land! 17 gallons is our total water usage for two days onboard Sunnyside.

water running from shower head

Cleaning your body to keep it only mildly smelly takes a little more work than when you were a land dweller. Here are a couple of things to minimize water usage when showering on a boat.

4 Tips to Shower with Less Water

Living on a boat, you quickly learn the joys of a “Navy Shower.” Wet down and turn the water off — soap up. Turn water on to rinse. All while using a minimal amount of water.

This process, along with a few other tricks, will help you get your shower water usage down to 1-2 gallons of water.

  1. Invest in a water-efficient shower head. We upgraded to an Oxygenics showerhead to save water and increase water pressure.
  2. Keep long hair clean. In subtropical or tropical climates, avoid washing your hair as often as your body. You might be sticky with sweat and sunscreen every night, but if you can keep your locks clean, it’ll save a ton of water. I keep my hair tucked in a UPF bandana (followed by a hat) most days. The bandana will keep hair out of the elements, and the cooling material wicks sweat. In the heat of summer in the southeast, I can usually go four days without washing my hair.
  3. Change up your routine to use fewer products. Investing in a leave-in conditioner or combined shampoo conditioner for hair is something on my to-do list. The water required to wash and rinse hair twice leads to a lot of extra water usage. I recommend trying different options before living aboard to find a regime that works for you.
  4. Bathe in the ocean. For the ultimate water savings in a tropical climate, jump in the ocean. Get in to wet down, back on the boat to scrub, jump in to rinse, and finish with a freshwater rinse on the transom.

Washing Dishes Onboard

Showering gets a wrap as one of the largest water uses on a boat. Yet, washing dishes can be just as heavy on water usage when you’re not prepared. 

woman washing dishes in boat galley

5 Tips for Washing Dishes

Here are five tips to make sure cleaning the dishes doesn’t drain your water tanks.

  1. Get a collapsible tub to put in the sink. Use this when washing dishes to soak and scrub your dishes. When we are off the dock, this collapsible tub is always in the sink.
  2. Start with relatively clean dishes. This habit will evolve naturally as you do dishes on a boat. You’ll start scraping out pots, wiping leftovers from bowls, and occasionally licking a plate clean. The cleaner the dishes are when you start washing, the less water you will use.
  3. Use a small amount of dish soap. Use just enough soap to cut through food and grease — the less soap and suds, the less water you’ll need to rinse.
  4. Install a faucet with a spray setting. Using the spray setting, you can turn the faucet about a quarter of the way on and still get a good rinse on the dishes. 
  5. Invest in a saltwater foot pump. Venturing down to the sugar scoop for a saltwater dish rinse is an excellent way to save water. But it’s not always convenient or safe. With a saltwater foot pump at the sink, you can easily wash dishes in saltwater and rinse them with fresh.

Laundry on a Boat

Doing laundry by hand on a boat can be a tricky chore. 

For a long time, I thought there was no way I could do laundry without a watermaker. Or we would have to dock to do laundry at least once every ten days.

laundry in small wash tub with washboard and fabric brush

The goal is to find a balance between clean clothes and minimal water usage. And also, to avoid wearing clothes that are bulky or heavy.

What to Wear to Make Laundry Easier on a Boat 

Quality synthetics are the preferable fabric on a boat. As much as we all love a comfy cotton shirt, it’s not ideal living on the water. You want clothing that doesn’t take up a lot of room in the wash bucket and is easy to dry.

Here are a few clothing items for subtropical climates that are easy to hand wash:

  • light-weight UPF shirts
  • athletic shorts
  • swimsuits
  • quality swim leggings or wool leggings
  • quality wool socks

4 Tips for Doing Laundry

Besides wearing the right clothes, here are four pro tips to make laundry less intimating and easy on the water supply.

  1. Do small loads in a small tub. Use a two-gallon collapsible tub to do a couple of small loads at a time. You can wash 3-4 light-weight clothing items and a few bathing suits in a small tub. A small washboard, a quality stain brush, and stain remover will help with dirt and sunscreen stains.
  2. Save dirtier items for the second wash. Once you have washed your less dirty clothes, you can do a small load of cleaning rags or work clothes in the same water.
  3. Use less soap. As with the dishes, you’ll want to use as little detergent as possible. It takes a small amount to hand wash clothing, just a dribble. I recommend a low sudsing detergent. Add a cap full of vinegar to your rinse water to help cut the remaining soap.
  4. Save bulky items for the washing machine. Heavier items such as sheets, hoodies, and jeans wash more efficiently in a machine. We keep an extra sheet set and wear jeans and hoodies multiple times before washing. When we go to the dock or have access to a washing machine, we take care of these items.
READ MORE: For more tips on what clothing to wear on a boat, check out What to Wear Sailing: The Best Clothing for Comfort on a Boat.

Bonus: Ideas to Repurpose Water

On a boat, you never throw out “cleanish” water. There’s always a use for it.

  • We use the cat’s stale drinking water to water herbs.
  • Water used to rinse the tea jugs also becomes plant water or dishwater.
  • Pasta water gets used to wash dishes.
  • The cooler’s melted ice water becomes water to make more ice (make sure the cooler and its contents are clean).

Everyone has different habits of water usage, so get creative with your water-saving techniques.


Start Practicing Water Savings

One of the best things you can do to conserve water is to form good habits.

Turn off the faucet when you aren’t actively using it. Wash clothes when they’re actually dirty. Be conscious of throwing water down the drain. Soon enough, saving water will become a part of your daily lifestyle.

Here are some other articles you might find helpful for saving water onboard.


Want more tips for cruising on a boat?

For more on finding the right boat, the cost of cruising, and learning how to live on the water, view our complete guide.


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