How big of a septic or cistern tank do I need for my house?

Proper sizing of a septic or a cistern tank depends upon a number of factors. For septic tanks, average sewage flow is the most important consideration. Most states require a minimum septic capacity of 1000 gallons. For cistern tank sizing, you need to determine your home water use. A good website to research what size is best for you can be found at For cistern tank sizing, consider the home water use calculator at

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Mark Peabody

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