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Choosing Septic Tank Size -- Basic Advice for Septic System Design
 

The right septic tank size depends on the anticipated usage not an arbitrary number. To determine the required septic tank size you would need to refer to TECQ Chapter 285 to see the required tank size based on daily water volume usage and perhaps the "Water Usage" table which discusses water usage requirements to confirm that you're estimating the water volume reasonably.




System Calculator
 
Number of Bedrooms Total Square Feet Minimum Tank Capacity Estimated Cost

3 <2500 400 gallons $7500
       
4 <3500 480 gallons $9000
less than 4 2501 - 3500 480 gallons $9000
       
5 <4500 600 gallons $9000
less than 5 3501 - 4500 600 gallons $9000
       
6 <5500 720 gallons $10,500
less than 6 4501 - 5500 720 gallons $10,500
       
7 <7000 840 gallons $10,500
less than 7 5501 - 7000 840 gallons $10,500
       
8 <8500 960 gallons call for quote
less than 8 7000 - 8500 960 gallons call for quote
       
9 <10,000 1080 gallons call for quote
less than 9 8501 - 10,000 1080 gallons call for quote
       
10 <11,500 1200 gallons call for quote
less than 10 10,001 - 11,500 1200 gallons call for quote

 

  
 
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