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How do I know what size septic tank I need?
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The first step is to determine the number of people in your household. You will also need to consider how often you plan on using the toilet and how many gallons per day are needed for each person. A general rule of thumb is that a single-family home needs about 1 gallon per day, while multi-family homes may need up to 3 gallons per day. Once you have determined these numbers, you can then calculate the size of the septic tank needed based on the total amount of water used by all members of the household.