How to Size a Septic Tank
Min tank size: Based on bedrooms per local code (usually 1000 gal for 3 BR)
Daily flow: Occupants x Gallons per person per day
Drain field: Daily flow / Soil application rate (gal/sq ft/day)
Standard Tank Sizes by Bedroom
- 1-2 bedrooms: 750-1,000 gallon tank
- 3 bedrooms: 1,000 gallon tank (most common)
- 4 bedrooms: 1,250 gallon tank
- 5-6 bedrooms: 1,500+ gallon tank
Maintenance Tips
- Pump tank every 3-5 years for a family of 4
- Do not drive or park over the drain field
- Avoid flushing non-biodegradable items
- Spread laundry loads throughout the week