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Wastewater Treatment

King County, Washington

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Only 1 percent of water on earth is fresh and available

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 Install low-flow fixtures.

Choose lower flow toilets or reduce tank volume.

Fix leaks and monitor meters for water use

Common types of leaks found in the home are worn toilet flappers, dripping faucets, and other leaking valves. Check your monitoring meter to help determine when more water than normal is being used.

Did you know? Leaks account for 14 percent of our water usage.

Helpful hint: putting a few drops of food coloring in the toilet tank can help determine if and where there are leaks.

Install low flow fixtures

Do you know how much water the average faucet uses?

Kitchen sink:          2.2 gallons/minute

Showerhead:         1.5 to 2.5 gallons/minute

Bathroom sink:      1.5 to 2.2 gallons/minute

Did you know? A 15-minute shower with a standard (2.5 gallons/minute) showerhead takes 37 gallons of water. A 15 minute shower with a low-flow showerhead only takes 22 gallons of water. How much water does your morning shower take?

Helpful hint: Look for the EPA WaterSense Logo to ensure low-flow performance.

Install low flow toilets

Not all toilets are made equal.

Standard toilet:         3.5 gallons/flush

Low flow toilet:         1.6 gallons/flush

Dual flush toilet:        0.8/1.6 gallons/flush

Composting toilet:    0 to <0.5 gallons/flush

Did you know? Toilets account for approx. 30% of water used indoors. By installing a Dual Flush toilet you can save between 40% and 70% of drinking water being flushed down the toilet, depending how old the toilet is you are going to replace.

Helpful Hint: Not ready to buy a new toilet? Replacing the water in the tank with a water bottle or milk jug filled with rocks will help reduce the water used.

Find out how you can help save water!
Use less water

Turn off faucets. Collect excess water in a bucket.
Turn off faucets