![]() When calculated this way, we are factoring in what should be the maximum load of water into the septic system per day.ĮXAMPLE: If Jen has a 4-bedroom home, her GPD per day would be 600. This number is calculated based on the double occupancy of each bedroom and the average water usage per person in the home at 75 gallons per day. When sizing a septic tank by bedroom count, the calculation is 150 GPD per bedroom in the home. The GPD determines the amount of water that is going into the septic system on a daily basis. This acronym is used a lot when talking about septic systems. GPD is an acronym that stands for Gallons Per Day. The second way is by fixture unit counts, which you can read in our next blog here. First, and most commonly used, is the metric for measuring the septic tank based on the bedroom count inside the home. ![]() ![]() If you are reading this outside of this area, you may want to check with your local county requirements.ĭetermining the size of the septic tank in our installation market is done in one of two ways. This blog post is written according to the sizing requirements from Maricopa and Pinal Counties in Arizona. There is a lot of misinformation out there explaining how this is correctly done. It’s crucial to consult with a qualified engineer or septic system expert to design and install a septic tank that meets the specific needs of the building and complies with local codes and standards.Determining what size of septic tank your home needs can be tricky. By following these steps and considering local regulations, you can select an appropriate septic tank size that effectively manages wastewater and ensures proper treatment and disposal. Conclusion:Ĭalculating the size and capacity of a septic tank involves estimating the daily water usage, calculating the total wastewater volume, and determining the required retention time. In this example, a septic tank with a capacity of approximately 1020 liters would be required to serve the household. Septic Tank Capacity = 510 liters/day × 2 (Retention Time) = 1020 liters Total Wastewater Volume = 600 liters/day × 0.85 (Wastewater Generation Factor) = 510 liters/day The wastewater generation factor is 85%, and a retention time of 2 days is desired.ĭaily Water Usage = 4 (residents) × 150 liters/person = 600 liters/day Let’s assume a household with four residents, each using an average of 150 liters of water per day. Septic Tank Capacity (in liters or gallons) = Daily Water Usage (in liters or gallons) × Wastewater Generation Factor × Retention Time (in days) Example: Standard septic tanks are available in various sizes, and it’s essential to choose a size that complies with local regulations and can accommodate the required capacity. Select a septic tank size that is equal to or slightly larger than the calculated septic tank capacity. Septic Tank Capacity = Total Wastewater Volume × Retention Time Step 5: Choose the Septic Tank Size To calculate the required septic tank capacity, multiply the total wastewater volume (from Step 2) by the retention time (in days). Step 4: Calculate the Septic Tank Capacity The recommended retention time is usually 1 to 3 days, depending on the local regulations and the tank’s design. The retention time is the duration for which the wastewater remains in the septic tank for treatment before it overflows to the soak pit or drainage field. Total Wastewater Volume = Daily Water Usage × Wastewater Generation Factor Step 3: Determine the Retention Time The wastewater generation factor is typically assumed to be around 80% to 90% of the total water usage, as not all water used goes into the septic tank. Multiply the daily water usage (in liters or gallons) by the wastewater generation factor to calculate the total wastewater volume. Step 2: Calculate the Total Wastewater Volume ![]() Consider factors such as the number of residents, average water consumption per person, and any additional water usage from appliances. Here’s a step-by-step guide on how to calculate the size and capacity of a septic tank: Step 1: Determine the Daily Water UsageĮstimate the daily water usage for the building or household that the septic tank will serve. The size of the septic tank depends on factors such as the number of users, daily water usage, and local regulations. Calculating the size and capacity of a septic tank involves estimating the required volume based on the wastewater generation and retention time. ![]()
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