size of septic tank | Septic Tank Pro

How Big of a Septic Tank Do You Need? Size by Bedrooms (2026)

October 16, 2026November 12, 2018 by septictadmin

Updated October 2026. Sizes checked against state septic code; your local health department sets the rule for your home. Most homes need a septic tank of at least 1,000 gallons, and septic tank size is set by the number of bedrooms, not square footage. Washington State, for example, requires at least 1,000 gallons for up … Read more

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